<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:7ddd8aca-4c09-47ed-a1ff-65a37ccc8210,g:db224338-bee1-466d-9a3e-d5aa4f16e15f-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/DocumentandEntityInformation" xlink:type="simple" xlink:href="crwd-20200731.xsd#DocumentandEntityInformation"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/DocumentandEntityInformation" xlink:type="extended" id="ica6c7639fc50429e99f7c178dfbf860a_DocumentandEntityInformation">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_2cdd886d-0f38-4776-addf-17a6bc63e3a4" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_DocumentType_2cdd886d-0f38-4776-addf-17a6bc63e3a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_fcbf453a-d223-4d40-b15d-5dad45cfe833" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_DocumentQuarterlyReport_fcbf453a-d223-4d40-b15d-5dad45cfe833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_a9fa6e46-cfd7-4dab-bd2b-e789efa7ec98" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_DocumentPeriodEndDate_a9fa6e46-cfd7-4dab-bd2b-e789efa7ec98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_d9deb803-3e38-4bed-8a91-7f9c8ea5ef19" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_DocumentTransitionReport_d9deb803-3e38-4bed-8a91-7f9c8ea5ef19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_e20e5bc2-959f-48f8-95b3-068acf7ab6a7" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityFileNumber_e20e5bc2-959f-48f8-95b3-068acf7ab6a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_2e74595c-b72d-4165-9a68-90049a95c022" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityRegistrantName_2e74595c-b72d-4165-9a68-90049a95c022" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_cf64041f-8933-44dc-ab84-7950e317914a" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityIncorporationStateCountryCode_cf64041f-8933-44dc-ab84-7950e317914a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_979e256c-3fbd-470f-88f9-7ba11009d198" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityTaxIdentificationNumber_979e256c-3fbd-470f-88f9-7ba11009d198" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_2bd734dd-c475-406a-9b9e-f379df6b6a92" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityAddressAddressLine1_2bd734dd-c475-406a-9b9e-f379df6b6a92" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_73c3916a-18a6-453f-860d-adec6b35a7f9" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityAddressAddressLine2_73c3916a-18a6-453f-860d-adec6b35a7f9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_621b3e92-4747-429f-9371-4a8e5c0dde40" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityAddressCityOrTown_621b3e92-4747-429f-9371-4a8e5c0dde40" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_2d1f8dd1-aa2b-4faf-b931-342c4eb98088" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityAddressStateOrProvince_2d1f8dd1-aa2b-4faf-b931-342c4eb98088" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_46c7b7fd-2b5b-4ac0-81fe-c8cd8e181424" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityAddressPostalZipCode_46c7b7fd-2b5b-4ac0-81fe-c8cd8e181424" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_17d00216-80b5-42fd-a7db-8b0d5b5f5430" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_Security12bTitle_17d00216-80b5-42fd-a7db-8b0d5b5f5430" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_07ff80db-3f4d-4577-8db2-9aa15130a721" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_TradingSymbol_07ff80db-3f4d-4577-8db2-9aa15130a721" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_1f56e35d-87c5-48aa-a9f9-958a966d552e" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_SecurityExchangeName_1f56e35d-87c5-48aa-a9f9-958a966d552e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_858c5f22-0c27-449c-995c-f95da2c2a2db" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_CityAreaCode_858c5f22-0c27-449c-995c-f95da2c2a2db" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_a427d018-eb18-47b3-99c1-caf71d70db74" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_LocalPhoneNumber_a427d018-eb18-47b3-99c1-caf71d70db74" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_31d4d5b2-1c09-49b3-be67-2a4d32001ce6" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityCurrentReportingStatus_31d4d5b2-1c09-49b3-be67-2a4d32001ce6" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_d66da0aa-27fe-4ee7-8566-a1e5d2887ba9" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityInteractiveDataCurrent_d66da0aa-27fe-4ee7-8566-a1e5d2887ba9" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_ba1d8e41-87e5-4b85-b83e-1dff5453732e" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityFilerCategory_ba1d8e41-87e5-4b85-b83e-1dff5453732e" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_b127f7b0-55c4-4c9e-b3c1-4f78e3e30e56" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntitySmallBusiness_b127f7b0-55c4-4c9e-b3c1-4f78e3e30e56" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_d0d01866-692c-4298-91b4-f061be5749f0" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityEmergingGrowthCompany_d0d01866-692c-4298-91b4-f061be5749f0" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_4eec12d6-d2b5-49b9-b16d-f3bd802b1556" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityExTransitionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityExTransitionPeriod_4eec12d6-d2b5-49b9-b16d-f3bd802b1556" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_32e1ba00-d6f4-4a1b-bb7b-af74a30bc803" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityShellCompany_32e1ba00-d6f4-4a1b-bb7b-af74a30bc803" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_8a992be8-23e3-45ca-a2a8-3fd08b6c14c0" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_8a992be8-23e3-45ca-a2a8-3fd08b6c14c0" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_a5704f86-c3d6-4f52-9e70-d7fea5a9a660" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_EntityCentralIndexKey_a5704f86-c3d6-4f52-9e70-d7fea5a9a660" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_a70cf5b6-fded-4595-8a45-73b25751bbc1" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_CurrentFiscalYearEndDate_a70cf5b6-fded-4595-8a45-73b25751bbc1" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_1f9a5727-0eb7-4da1-8da6-63c3c94ca0e1" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_DocumentFiscalYearFocus_1f9a5727-0eb7-4da1-8da6-63c3c94ca0e1" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_34d5abfa-4bbc-4768-a460-4c52c492bbe4" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_DocumentFiscalPeriodFocus_34d5abfa-4bbc-4768-a460-4c52c492bbe4" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_f05ca972-403c-4a36-9e0f-a625eef191d9" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_dei_AmendmentFlag_f05ca972-403c-4a36-9e0f-a625eef191d9" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_31fbaa99-ab4b-465b-aa0d-ab032fcfa9d5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_68742c0b-ed09-43c8-b38a-f4f1a840be7c" xlink:to="loc_us-gaap_StatementTable_31fbaa99-ab4b-465b-aa0d-ab032fcfa9d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_5d67fd89-ef01-4493-af96-6058a23f1034" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_31fbaa99-ab4b-465b-aa0d-ab032fcfa9d5" xlink:to="loc_us-gaap_StatementClassOfStockAxis_5d67fd89-ef01-4493-af96-6058a23f1034" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_5d67fd89-ef01-4493-af96-6058a23f1034_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5d67fd89-ef01-4493-af96-6058a23f1034" xlink:to="loc_us-gaap_ClassOfStockDomain_5d67fd89-ef01-4493-af96-6058a23f1034_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_76e5c428-6ee1-43b0-9b89-74cf49d41b54" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5d67fd89-ef01-4493-af96-6058a23f1034" xlink:to="loc_us-gaap_ClassOfStockDomain_76e5c428-6ee1-43b0-9b89-74cf49d41b54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_18139914-439b-48bd-a984-14d683e2897d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_76e5c428-6ee1-43b0-9b89-74cf49d41b54" xlink:to="loc_us-gaap_CommonClassAMember_18139914-439b-48bd-a984-14d683e2897d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_2278cc18-72d5-4fd6-9300-f0a6e88e3565" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_76e5c428-6ee1-43b0-9b89-74cf49d41b54" xlink:to="loc_us-gaap_CommonClassBMember_2278cc18-72d5-4fd6-9300-f0a6e88e3565" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="crwd-20200731.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended" id="ia310e285aeae419581a13672d853a9d2_CondensedConsolidatedBalanceSheets">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_a9303c0d-26aa-42aa-ac51-c7babf5025c6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a9303c0d-26aa-42aa-ac51-c7babf5025c6" xlink:to="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1269764c-2d67-4eab-8533-93396b4cce8e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1269764c-2d67-4eab-8533-93396b4cce8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_96231576-dbdc-417d-b828-1e9a86111f68" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_96231576-dbdc-417d-b828-1e9a86111f68" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_82978906-4c12-4335-ae62-8a489281f252" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_82978906-4c12-4335-ae62-8a489281f252" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetCurrent_6b3269c4-80b2-47e3-bc7e-eb5c98ad810a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:to="loc_us-gaap_CapitalizedContractCostNetCurrent_6b3269c4-80b2-47e3-bc7e-eb5c98ad810a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_40fc8cde-667b-4bcf-84dd-d2872bb489b0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_40fc8cde-667b-4bcf-84dd-d2872bb489b0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_e27e9e01-fa17-47b5-a8bd-2d1a0c572a85" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_11c9631a-87fa-45b5-bc8b-3a2f3383092e" xlink:to="loc_us-gaap_AssetsCurrent_e27e9e01-fa17-47b5-a8bd-2d1a0c572a85" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentAggregateCost_ef719eb6-1039-4058-83be-05618844aa65" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestmentAggregateCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_EquityMethodInvestmentAggregateCost_ef719eb6-1039-4058-83be-05618844aa65" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_4e7627a4-a89c-4077-93db-e81ebcd44e5d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_4e7627a4-a89c-4077-93db-e81ebcd44e5d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_3936bd72-a3ff-4885-a373-fba82ad95aca" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_3936bd72-a3ff-4885-a373-fba82ad95aca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_51ca7a72-a3bc-4698-98dc-47a3182c5b82" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_51ca7a72-a3bc-4698-98dc-47a3182c5b82" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_8a9e7273-9a05-4991-b901-3bfe489d1816" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_Goodwill_8a9e7273-9a05-4991-b901-3bfe489d1816" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bddcdca6-56ee-48c6-a0e7-86cfe65cad62" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bddcdca6-56ee-48c6-a0e7-86cfe65cad62" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_b255686f-a07d-4c7f-992c-fdbd7ff9c1ed" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_b255686f-a07d-4c7f-992c-fdbd7ff9c1ed" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_aee4b090-a216-43ad-966d-d89f262bf1eb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7b9f9b80-90ef-41a5-b942-73cea68352d3" xlink:to="loc_us-gaap_Assets_aee4b090-a216-43ad-966d-d89f262bf1eb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a9303c0d-26aa-42aa-ac51-c7babf5025c6" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_c7b7ca71-b64f-45e7-bc4b-fe831b35a81c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:to="loc_us-gaap_AccountsPayableCurrent_c7b7ca71-b64f-45e7-bc4b-fe831b35a81c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_8cb12986-6509-4ee2-bcf7-eb402527ff9e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_8cb12986-6509-4ee2-bcf7-eb402527ff9e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_bbb0f92d-e0a5-4dcb-b144-e649b2ce75e8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_bbb0f92d-e0a5-4dcb-b144-e649b2ce75e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_50f4bb42-5c48-4bca-a001-cfd92b4375ff" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_50f4bb42-5c48-4bca-a001-cfd92b4375ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_f1030ec2-0273-4b96-9861-d3bd6339bde2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_f1030ec2-0273-4b96-9861-d3bd6339bde2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_a451b2a0-d400-41db-91ff-4529ce1be419" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_a451b2a0-d400-41db-91ff-4529ce1be419" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_daf6e7ba-5ac1-4bf6-adf5-e45ab2831af9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_5c04ea45-8c90-4215-a44a-67aefb4a97f4" xlink:to="loc_us-gaap_LiabilitiesCurrent_daf6e7ba-5ac1-4bf6-adf5-e45ab2831af9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e6fb5d7e-3e08-48fb-b2be-433fbd74d5cf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e6fb5d7e-3e08-48fb-b2be-433fbd74d5cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_cea1a716-2503-4f63-9248-e537f6c03346" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_cea1a716-2503-4f63-9248-e537f6c03346" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_d2fe264b-07ea-40dd-8934-be3d7c41de79" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_d2fe264b-07ea-40dd-8934-be3d7c41de79" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_9c6f33f6-a5b4-460b-abb0-534e810fd4e4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:to="loc_us-gaap_Liabilities_9c6f33f6-a5b4-460b-abb0-534e810fd4e4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_9c2f0492-d8bf-40dc-b962-b52a6932c2fb" xlink:to="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_d0482e67-dcf8-4408-9295-eec32e5143b1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_PreferredStockValue_d0482e67-dcf8-4408-9295-eec32e5143b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_3ec19cbe-eb23-413d-b718-9896603776d0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_CommonStockValue_3ec19cbe-eb23-413d-b718-9896603776d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_9c04f8f2-e7a5-40e0-b587-372f3ac4bee5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_AdditionalPaidInCapital_9c04f8f2-e7a5-40e0-b587-372f3ac4bee5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_b2daf05e-7296-447e-8135-effba2aa8426" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_b2daf05e-7296-447e-8135-effba2aa8426" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6532d432-1cc3-472f-9f48-dc4759dd0bc3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6532d432-1cc3-472f-9f48-dc4759dd0bc3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_6151ebb2-f13c-452b-9709-238d507aa7da" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_StockholdersEquity_6151ebb2-f13c-452b-9709-238d507aa7da" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_7d5fab29-3234-4fec-80c7-e14fdd4cd57f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_MinorityInterest_7d5fab29-3234-4fec-80c7-e14fdd4cd57f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_bd25a6ba-16c2-43f2-9e1b-e356eac26486" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_bd25a6ba-16c2-43f2-9e1b-e356eac26486" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_8742bba2-cb26-4098-af76-b4dd351ffc68" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d3d2dcb3-b91a-4e93-b4ab-647e4ce2b859" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_8742bba2-cb26-4098-af76-b4dd351ffc68" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_e92a3cf6-b551-4263-b4cc-0408a12936ee" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_a9303c0d-26aa-42aa-ac51-c7babf5025c6" xlink:to="loc_us-gaap_StatementTable_e92a3cf6-b551-4263-b4cc-0408a12936ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_58d68bab-584a-4f9f-bec6-55b2f3c8e40e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_e92a3cf6-b551-4263-b4cc-0408a12936ee" xlink:to="loc_us-gaap_StatementClassOfStockAxis_58d68bab-584a-4f9f-bec6-55b2f3c8e40e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_58d68bab-584a-4f9f-bec6-55b2f3c8e40e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_58d68bab-584a-4f9f-bec6-55b2f3c8e40e" xlink:to="loc_us-gaap_ClassOfStockDomain_58d68bab-584a-4f9f-bec6-55b2f3c8e40e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_bb621939-0589-4e24-9398-08c7f8c3ebfd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_58d68bab-584a-4f9f-bec6-55b2f3c8e40e" xlink:to="loc_us-gaap_ClassOfStockDomain_bb621939-0589-4e24-9398-08c7f8c3ebfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CommonClassAAndBMember_3ea9d166-8f58-4f41-b31c-160d69e2f815" xlink:href="crwd-20200731.xsd#crwd_CommonClassAAndBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_bb621939-0589-4e24-9398-08c7f8c3ebfd" xlink:to="loc_crwd_CommonClassAAndBMember_3ea9d166-8f58-4f41-b31c-160d69e2f815" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_793d3b9d-359d-4cef-821a-d1a3c584f371" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_bb621939-0589-4e24-9398-08c7f8c3ebfd" xlink:to="loc_us-gaap_CommonClassBMember_793d3b9d-359d-4cef-821a-d1a3c584f371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_ed8d4486-0e47-4546-8e77-2791c90dff2a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_bb621939-0589-4e24-9398-08c7f8c3ebfd" xlink:to="loc_us-gaap_CommonClassAMember_ed8d4486-0e47-4546-8e77-2791c90dff2a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="crwd-20200731.xsd#CondensedConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" id="icd7e74a26fb94390a7dde4daf27c7b4e_CondensedConsolidatedBalanceSheetsParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_03c64e76-3e19-4fd9-9a82-9cbbec03f643" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_03c64e76-3e19-4fd9-9a82-9cbbec03f643" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_7811a29f-6115-4605-a56f-8973621c6a2a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_7811a29f-6115-4605-a56f-8973621c6a2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_80133c08-b2b4-4378-8582-101a6983bc74" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_80133c08-b2b4-4378-8582-101a6983bc74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_e12b1abb-1415-4bb5-a95f-33ed23c6604b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_PreferredStockSharesIssued_e12b1abb-1415-4bb5-a95f-33ed23c6604b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_a36c4ba1-0861-4dd4-8ef8-9ba7295900c0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_a36c4ba1-0861-4dd4-8ef8-9ba7295900c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_20ac0450-4ee9-4be9-8111-6baac0331456" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_20ac0450-4ee9-4be9-8111-6baac0331456" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_a4962300-5ab0-4320-bb02-1617c2bb22ba" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_a4962300-5ab0-4320-bb02-1617c2bb22ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_15304c20-fe22-4b28-acd6-cf0dbb3e99f5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_CommonStockSharesIssued_15304c20-fe22-4b28-acd6-cf0dbb3e99f5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_91b94fb6-4640-459b-9597-6aba1f965985" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_91b94fb6-4640-459b-9597-6aba1f965985" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_dd9e17d4-44b8-4ad5-91ab-e80d59444ccf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_f769c7e0-0b6d-4717-a562-6c0d89ff3320" xlink:to="loc_us-gaap_StatementTable_dd9e17d4-44b8-4ad5-91ab-e80d59444ccf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_dbe3e8eb-a906-4f07-8810-45d42c280c0e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_dd9e17d4-44b8-4ad5-91ab-e80d59444ccf" xlink:to="loc_us-gaap_StatementClassOfStockAxis_dbe3e8eb-a906-4f07-8810-45d42c280c0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_dbe3e8eb-a906-4f07-8810-45d42c280c0e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dbe3e8eb-a906-4f07-8810-45d42c280c0e" xlink:to="loc_us-gaap_ClassOfStockDomain_dbe3e8eb-a906-4f07-8810-45d42c280c0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f0fcf20a-a32a-400e-b7c7-2beb9d6a0c70" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dbe3e8eb-a906-4f07-8810-45d42c280c0e" xlink:to="loc_us-gaap_ClassOfStockDomain_f0fcf20a-a32a-400e-b7c7-2beb9d6a0c70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_0aae4ebd-78c3-4325-bdf3-235cb7600307" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f0fcf20a-a32a-400e-b7c7-2beb9d6a0c70" xlink:to="loc_us-gaap_CommonClassAMember_0aae4ebd-78c3-4325-bdf3-235cb7600307" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_1cab6dc5-3333-42f4-a246-b216085fc966" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f0fcf20a-a32a-400e-b7c7-2beb9d6a0c70" xlink:to="loc_us-gaap_CommonClassBMember_1cab6dc5-3333-42f4-a246-b216085fc966" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="crwd-20200731.xsd#CondensedConsolidatedStatementsofOperations"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofOperations" xlink:type="extended" id="iecc2ee8204fd44b2981cde56990df3a8_CondensedConsolidatedStatementsofOperations">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_2eb06aea-8b43-4474-979b-7160af7c6663" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_RevenuesAbstract_2eb06aea-8b43-4474-979b-7160af7c6663" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_f1776e05-db70-4371-80c8-91c792b331f2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_2eb06aea-8b43-4474-979b-7160af7c6663" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_f1776e05-db70-4371-80c8-91c792b331f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_876a1f88-2807-45b4-a228-397d815bc9b5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_CostOfRevenueAbstract_876a1f88-2807-45b4-a228-397d815bc9b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_cdc3d885-1b2e-4d1d-95f5-8d583b9434ae" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_876a1f88-2807-45b4-a228-397d815bc9b5" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_cdc3d885-1b2e-4d1d-95f5-8d583b9434ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_a7d2d704-c3d9-4068-8dfe-e91b5f41bb00" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_GrossProfit_a7d2d704-c3d9-4068-8dfe-e91b5f41bb00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_a8d48052-3c16-4ba2-935b-c834484a7a21" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_OperatingExpensesAbstract_a8d48052-3c16-4ba2-935b-c834484a7a21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_cc11d66c-b452-4af2-b3ec-41ca5f9f0a97" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_a8d48052-3c16-4ba2-935b-c834484a7a21" xlink:to="loc_us-gaap_SellingAndMarketingExpense_cc11d66c-b452-4af2-b3ec-41ca5f9f0a97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_1fa88814-1011-4d98-9b0c-41c8f7df081a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_a8d48052-3c16-4ba2-935b-c834484a7a21" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_1fa88814-1011-4d98-9b0c-41c8f7df081a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_fea347bb-5630-4ae7-b82a-aed8c866d343" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_a8d48052-3c16-4ba2-935b-c834484a7a21" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_fea347bb-5630-4ae7-b82a-aed8c866d343" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_829006c2-3e72-43c5-b7c8-9e21dd7f545a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_a8d48052-3c16-4ba2-935b-c834484a7a21" xlink:to="loc_us-gaap_OperatingExpenses_829006c2-3e72-43c5-b7c8-9e21dd7f545a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_eaedb63e-090b-4836-b85e-89469335e837" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_OperatingIncomeLoss_eaedb63e-090b-4836-b85e-89469335e837" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_3ac861a4-1096-4065-9cf3-be59ac0641bf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_InterestExpense_3ac861a4-1096-4065-9cf3-be59ac0641bf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_0fc7bc70-9b6d-46dc-9d40-f14144476c96" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_0fc7bc70-9b6d-46dc-9d40-f14144476c96" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e1744113-3bf0-432a-9300-6dc72202267d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e1744113-3bf0-432a-9300-6dc72202267d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_a1194491-d874-467c-b8b2-79fc4b850fad" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_a1194491-d874-467c-b8b2-79fc4b850fad" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_2b9bc397-ee08-4ec5-8ff0-6e9dcf9e471e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_NetIncomeLoss_2b9bc397-ee08-4ec5-8ff0-6e9dcf9e471e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_aeaff595-23ac-484e-bdd5-52b9be044e9f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDiluted_aeaff595-23ac-484e-bdd5-52b9be044e9f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2584c2dd-f9ef-4417-807f-f5d8df4e0ee3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2584c2dd-f9ef-4417-807f-f5d8df4e0ee3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b2c8cb85-8a04-4e52-b872-0943b2cf67b5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_425dc11d-bfa3-44f9-aec8-197776502d24" xlink:to="loc_us-gaap_StatementTable_b2c8cb85-8a04-4e52-b872-0943b2cf67b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_2522bc5c-47ae-479d-abff-7ef121709e7b" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b2c8cb85-8a04-4e52-b872-0943b2cf67b5" xlink:to="loc_srt_ProductOrServiceAxis_2522bc5c-47ae-479d-abff-7ef121709e7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_2522bc5c-47ae-479d-abff-7ef121709e7b_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_2522bc5c-47ae-479d-abff-7ef121709e7b" xlink:to="loc_srt_ProductsAndServicesDomain_2522bc5c-47ae-479d-abff-7ef121709e7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9d8467c6-17d9-4bb2-8c82-65854ffb98b9" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_2522bc5c-47ae-479d-abff-7ef121709e7b" xlink:to="loc_srt_ProductsAndServicesDomain_9d8467c6-17d9-4bb2-8c82-65854ffb98b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubscriptionAndCirculationMember_5ab0d6ed-3678-4f59-8176-1f1cf5e42837" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubscriptionAndCirculationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9d8467c6-17d9-4bb2-8c82-65854ffb98b9" xlink:to="loc_us-gaap_SubscriptionAndCirculationMember_5ab0d6ed-3678-4f59-8176-1f1cf5e42837" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ProfessionalServicesMember_64870262-74b4-4e61-86c4-87d6877f3db0" xlink:href="crwd-20200731.xsd#crwd_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9d8467c6-17d9-4bb2-8c82-65854ffb98b9" xlink:to="loc_crwd_ProfessionalServicesMember_64870262-74b4-4e61-86c4-87d6877f3db0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofComprehensiveLoss" xlink:type="simple" xlink:href="crwd-20200731.xsd#CondensedConsolidatedStatementsofComprehensiveLoss"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofComprehensiveLoss" xlink:type="extended" id="i0167a94ce8604752a4ec64986c68b718_CondensedConsolidatedStatementsofComprehensiveLoss"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersDeficit" xlink:type="simple" xlink:href="crwd-20200731.xsd#CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersDeficit"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersDeficit" xlink:type="extended" id="i095607a94412419084626401d75b7da0_CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersDeficit">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_38f5cf27-9bce-4fc5-9d3a-ad1c902e2534" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_b04b7e3a-7daf-4764-8282-462229d95fcb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38f5cf27-9bce-4fc5-9d3a-ad1c902e2534" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_b04b7e3a-7daf-4764-8282-462229d95fcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_82c3a9f7-becc-4c75-9c69-db92488d719a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_b04b7e3a-7daf-4764-8282-462229d95fcb" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_82c3a9f7-becc-4c75-9c69-db92488d719a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_116afb91-100f-4c24-b4de-967e222319b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_b04b7e3a-7daf-4764-8282-462229d95fcb" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_116afb91-100f-4c24-b4de-967e222319b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_e9513e3f-0960-4eb4-9ae7-67c7a7a7c3db" xlink:href="crwd-20200731.xsd#crwd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_b04b7e3a-7daf-4764-8282-462229d95fcb" xlink:to="loc_crwd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_e9513e3f-0960-4eb4-9ae7-67c7a7a7c3db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_11398099-c71d-46b9-a917-78b010e4a89e" xlink:href="crwd-20200731.xsd#crwd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_b04b7e3a-7daf-4764-8282-462229d95fcb" xlink:to="loc_crwd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_11398099-c71d-46b9-a917-78b010e4a89e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_fbf1f773-159b-4b2d-9406-550d9dab1c05" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_de620685-578b-4cd5-bb2b-4526295fe836" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38f5cf27-9bce-4fc5-9d3a-ad1c902e2534" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_7f96b8e7-c285-4bfa-9345-890fdd456343" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_SharesOutstanding_7f96b8e7-c285-4bfa-9345-890fdd456343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_ab3058b1-e4a0-48df-8184-64e756b0a992" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockholdersEquity_ab3058b1-e4a0-48df-8184-64e756b0a992" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5396e4a3-ccdd-42c2-9adb-8aa99364c151" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5396e4a3-ccdd-42c2-9adb-8aa99364c151" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_00924d66-4d68-4db6-a631-89de1d4ddb7c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_00924d66-4d68-4db6-a631-89de1d4ddb7c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_9ae8b30e-ecd5-4dd3-8f79-9732b13bd2b8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_9ae8b30e-ecd5-4dd3-8f79-9732b13bd2b8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_ae26f777-49f5-47bf-a1e1-a3b92f727d8f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_ae26f777-49f5-47bf-a1e1-a3b92f727d8f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_41368284-bc9e-46d3-8fe5-5538d3544e28" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_41368284-bc9e-46d3-8fe5-5538d3544e28" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_07cd02eb-4dff-4be3-a088-b9e75a6801b9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_07cd02eb-4dff-4be3-a088-b9e75a6801b9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_b9d32f88-20ad-4f82-8ce2-b3fc66656082" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_b9d32f88-20ad-4f82-8ce2-b3fc66656082" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockAndWarrantsIssuedDuringPeriodSharesPreferredStockAndWarrants_bd28f184-9989-4e32-bcc0-82a9b3456aef" xlink:href="crwd-20200731.xsd#crwd_StockAndWarrantsIssuedDuringPeriodSharesPreferredStockAndWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_crwd_StockAndWarrantsIssuedDuringPeriodSharesPreferredStockAndWarrants_bd28f184-9989-4e32-bcc0-82a9b3456aef" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_75716058-deb9-4f5c-8944-469498eb2721" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_75716058-deb9-4f5c-8944-469498eb2721" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_5ef4cad7-bf8c-4eae-847a-bbcdd8df6ded" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_5ef4cad7-bf8c-4eae-847a-bbcdd8df6ded" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesRSURelease_600dfc31-076d-4404-9488-a55898797e26" xlink:href="crwd-20200731.xsd#crwd_StockIssuedDuringPeriodSharesRSURelease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesRSURelease_600dfc31-076d-4404-9488-a55898797e26" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodValueRSURelease_02bdb923-a9e0-4489-b103-9a526837b7bf" xlink:href="crwd-20200731.xsd#crwd_StockIssuedDuringPeriodValueRSURelease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_crwd_StockIssuedDuringPeriodValueRSURelease_02bdb923-a9e0-4489-b103-9a526837b7bf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_f322104e-5ce2-4a6b-871f-0db8c0884b13" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_f322104e-5ce2-4a6b-871f-0db8c0884b13" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_220892ef-d56c-473c-aae9-54b06304cc61" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_220892ef-d56c-473c-aae9-54b06304cc61" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_ee24b2b9-213d-41f8-8a77-db16ebc14e3a" xlink:href="crwd-20200731.xsd#crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_ee24b2b9-213d-41f8-8a77-db16ebc14e3a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationVestingOfEarlyExercisedOptions_b42d8595-aa86-4be2-9caf-1bb876ebe3c8" xlink:href="crwd-20200731.xsd#crwd_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationVestingOfEarlyExercisedOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_crwd_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationVestingOfEarlyExercisedOptions_b42d8595-aa86-4be2-9caf-1bb876ebe3c8" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fc9aa8fb-800b-4ced-9603-83f0849fd567" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fc9aa8fb-800b-4ced-9603-83f0849fd567" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_AdjustmentsToAdditionalPaidInCapitalCapitalizedShareBasedCompensationRequisiteServicePeriodRecognitionValue_84ad7934-2fa3-446d-9bb9-2082d1f4fd25" xlink:href="crwd-20200731.xsd#crwd_AdjustmentsToAdditionalPaidInCapitalCapitalizedShareBasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_crwd_AdjustmentsToAdditionalPaidInCapitalCapitalizedShareBasedCompensationRequisiteServicePeriodRecognitionValue_84ad7934-2fa3-446d-9bb9-2082d1f4fd25" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_eca54e67-65e3-4690-bed5-e7aab0e42d36" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_NetIncomeLoss_eca54e67-65e3-4690-bed5-e7aab0e42d36" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NoncontrollingInterestIncreaseFromContribution_6a05bdba-3815-4e95-b285-9f62ece1271e" xlink:href="crwd-20200731.xsd#crwd_NoncontrollingInterestIncreaseFromContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_crwd_NoncontrollingInterestIncreaseFromContribution_6a05bdba-3815-4e95-b285-9f62ece1271e" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_78b652d9-cf66-41b9-9825-09e95f8719e6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0fd23bd7-fdad-4d29-be27-676f18cd42ad" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_78b652d9-cf66-41b9-9825-09e95f8719e6" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_5138a769-56ba-4a17-b0e1-c9b2d168ccea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_43db3ab9-fd25-4ee9-bc0c-27b59754204e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ccabd168-ec20-460c-a81e-a984f1f5c265" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_46ecef66-13ba-4ba3-be96-6993ce35ef45" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_38f5cf27-9bce-4fc5-9d3a-ad1c902e2534" xlink:to="loc_us-gaap_StatementTable_46ecef66-13ba-4ba3-be96-6993ce35ef45" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_3198622c-8552-461d-b613-53cb36790345" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_46ecef66-13ba-4ba3-be96-6993ce35ef45" xlink:to="loc_us-gaap_StatementClassOfStockAxis_3198622c-8552-461d-b613-53cb36790345" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3198622c-8552-461d-b613-53cb36790345_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3198622c-8552-461d-b613-53cb36790345" xlink:to="loc_us-gaap_ClassOfStockDomain_3198622c-8552-461d-b613-53cb36790345_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_57dc36bf-cf14-4de8-9670-c142596c3a84" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3198622c-8552-461d-b613-53cb36790345" xlink:to="loc_us-gaap_ClassOfStockDomain_57dc36bf-cf14-4de8-9670-c142596c3a84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableConvertiblePreferredStockMember_d41c36fa-b860-4ace-b3aa-09aae570b8a0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RedeemableConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_57dc36bf-cf14-4de8-9670-c142596c3a84" xlink:to="loc_us-gaap_RedeemableConvertiblePreferredStockMember_d41c36fa-b860-4ace-b3aa-09aae570b8a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_de8c697a-1654-44d3-bbed-6c4c6f6079cb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_46ecef66-13ba-4ba3-be96-6993ce35ef45" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_de8c697a-1654-44d3-bbed-6c4c6f6079cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_de8c697a-1654-44d3-bbed-6c4c6f6079cb_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_de8c697a-1654-44d3-bbed-6c4c6f6079cb" xlink:to="loc_us-gaap_EquityComponentDomain_de8c697a-1654-44d3-bbed-6c4c6f6079cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d2c4181a-db86-44d7-b9ea-ca1a155e42ec" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_de8c697a-1654-44d3-bbed-6c4c6f6079cb" xlink:to="loc_us-gaap_EquityComponentDomain_d2c4181a-db86-44d7-b9ea-ca1a155e42ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_6140aa07-d65f-4e55-b7da-9147a7d8f292" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d2c4181a-db86-44d7-b9ea-ca1a155e42ec" xlink:to="loc_us-gaap_CommonStockMember_6140aa07-d65f-4e55-b7da-9147a7d8f292" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_a04ab68f-2b8b-4d1d-aa71-9c0882014443" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d2c4181a-db86-44d7-b9ea-ca1a155e42ec" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_a04ab68f-2b8b-4d1d-aa71-9c0882014443" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_e692cd50-783c-4681-a4aa-3db8fac5c013" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d2c4181a-db86-44d7-b9ea-ca1a155e42ec" xlink:to="loc_us-gaap_RetainedEarningsMember_e692cd50-783c-4681-a4aa-3db8fac5c013" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f86c1823-b4a2-4468-8de2-a0fb80046c70" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d2c4181a-db86-44d7-b9ea-ca1a155e42ec" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f86c1823-b4a2-4468-8de2-a0fb80046c70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_5f2d302b-2840-4a96-bbd0-38885b5b5644" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d2c4181a-db86-44d7-b9ea-ca1a155e42ec" xlink:to="loc_us-gaap_NoncontrollingInterestMember_5f2d302b-2840-4a96-bbd0-38885b5b5644" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_0caead01-ad5b-4da2-bd4e-f55b0f0817b8" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_46ecef66-13ba-4ba3-be96-6993ce35ef45" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_0caead01-ad5b-4da2-bd4e-f55b0f0817b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_0caead01-ad5b-4da2-bd4e-f55b0f0817b8_default" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_0caead01-ad5b-4da2-bd4e-f55b0f0817b8" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_0caead01-ad5b-4da2-bd4e-f55b0f0817b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_2b45e214-09a9-4113-8cf9-180f26036650" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_0caead01-ad5b-4da2-bd4e-f55b0f0817b8" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_2b45e214-09a9-4113-8cf9-180f26036650" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_27e172a1-b4c9-4505-bfc7-e6b2accc50d6" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_2b45e214-09a9-4113-8cf9-180f26036650" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_27e172a1-b4c9-4505-bfc7-e6b2accc50d6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="crwd-20200731.xsd#CondensedConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="extended" id="i712f006031b84ee0a648955b546996aa_CondensedConsolidatedStatementsofCashFlows"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentation" xlink:type="simple" xlink:href="crwd-20200731.xsd#DescriptionofBusinessandBasisofPresentation"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentation" xlink:type="extended" id="icce139a8b5894c3f87eada8c09e36d17_DescriptionofBusinessandBasisofPresentation"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentationDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#DescriptionofBusinessandBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentationDetails" xlink:type="extended" id="ie2dd637ec7f846d2959253f654755e5f_DescriptionofBusinessandBasisofPresentationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NumberOfCloudModules_d8e92372-06b7-4dd2-8bda-d2e1cca8fdb2" xlink:href="crwd-20200731.xsd#crwd_NumberOfCloudModules"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_crwd_NumberOfCloudModules_d8e92372-06b7-4dd2-8bda-d2e1cca8fdb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_f03e1ee8-5b69-40e1-9567-12d51aa31db3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_f03e1ee8-5b69-40e1-9567-12d51aa31db3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_8b2e5519-bd2e-42f0-911a-a731244c23a1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_us-gaap_SharePrice_8b2e5519-bd2e-42f0-911a-a731244c23a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_4aa6669d-635d-4291-8f7c-d7641eb2c2b8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_4aa6669d-635d-4291-8f7c-d7641eb2c2b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PaymentsOfUnderwritersDiscountsAndCommissions_583ae8da-4ec0-4a60-9b2b-be8d80203031" xlink:href="crwd-20200731.xsd#crwd_PaymentsOfUnderwritersDiscountsAndCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_crwd_PaymentsOfUnderwritersDiscountsAndCommissions_583ae8da-4ec0-4a60-9b2b-be8d80203031" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesIssued1_f47e23de-9dd4-4ac3-9e88-a21f567fb611" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_us-gaap_ConversionOfStockSharesIssued1_f47e23de-9dd4-4ac3-9e88-a21f567fb611" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockConversionCommonStockConversionRatio_cb088981-450f-4422-a95d-e913d7a7f8ab" xlink:href="crwd-20200731.xsd#crwd_StockConversionCommonStockConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_crwd_StockConversionCommonStockConversionRatio_cb088981-450f-4422-a95d-e913d7a7f8ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ConversionOfWarrantsWarrantsIssued_07c15f8a-aa75-461b-a271-4c0f54fe5d8e" xlink:href="crwd-20200731.xsd#crwd_ConversionOfWarrantsWarrantsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_crwd_ConversionOfWarrantsWarrantsIssued_07c15f8a-aa75-461b-a271-4c0f54fe5d8e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockConversionWarrantsConversionRatio_f1638fc9-9f52-43a2-ab87-8bd7fd90db1d" xlink:href="crwd-20200731.xsd#crwd_StockConversionWarrantsConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_crwd_StockConversionWarrantsConversionRatio_f1638fc9-9f52-43a2-ab87-8bd7fd90db1d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_43bf3a15-3956-4562-af0e-34d12458a31b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_7b8aae9e-48bb-4bc6-b5c5-379ff763da13" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_43bf3a15-3956-4562-af0e-34d12458a31b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_204c664d-a969-443c-a2f4-bdbe1d64db3a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_43bf3a15-3956-4562-af0e-34d12458a31b" xlink:to="loc_us-gaap_StatementClassOfStockAxis_204c664d-a969-443c-a2f4-bdbe1d64db3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_204c664d-a969-443c-a2f4-bdbe1d64db3a_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_204c664d-a969-443c-a2f4-bdbe1d64db3a" xlink:to="loc_us-gaap_ClassOfStockDomain_204c664d-a969-443c-a2f4-bdbe1d64db3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_a5865bca-3237-4eac-bbbd-72ddaf66b42d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_204c664d-a969-443c-a2f4-bdbe1d64db3a" xlink:to="loc_us-gaap_ClassOfStockDomain_a5865bca-3237-4eac-bbbd-72ddaf66b42d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_feaee5f3-8266-494c-b2a1-6bf6b8c29e11" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a5865bca-3237-4eac-bbbd-72ddaf66b42d" xlink:to="loc_us-gaap_CommonClassAMember_feaee5f3-8266-494c-b2a1-6bf6b8c29e11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_aad7f798-6372-4c3a-912f-0001d808cf1b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a5865bca-3237-4eac-bbbd-72ddaf66b42d" xlink:to="loc_us-gaap_CommonClassBMember_aad7f798-6372-4c3a-912f-0001d808cf1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_cec4f00c-e6d5-4adb-949d-1f523ff9bebe" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_43bf3a15-3956-4562-af0e-34d12458a31b" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_cec4f00c-e6d5-4adb-949d-1f523ff9bebe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_cec4f00c-e6d5-4adb-949d-1f523ff9bebe_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_cec4f00c-e6d5-4adb-949d-1f523ff9bebe" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_cec4f00c-e6d5-4adb-949d-1f523ff9bebe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_358d5704-b936-4068-a383-ff956c9b9d14" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_cec4f00c-e6d5-4adb-949d-1f523ff9bebe" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_358d5704-b936-4068-a383-ff956c9b9d14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_30a94d7c-9d9f-4a3e-a8a6-4ce0594c027a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_358d5704-b936-4068-a383-ff956c9b9d14" xlink:to="loc_us-gaap_IPOMember_30a94d7c-9d9f-4a3e-a8a6-4ce0594c027a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPolicies" xlink:type="simple" xlink:href="crwd-20200731.xsd#SummaryofSignificantAccountingPolicies"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPolicies" xlink:type="extended" id="i1771e016c4e942a9ab43f478f8f58e2c_SummaryofSignificantAccountingPolicies"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="crwd-20200731.xsd#SummaryofSignificantAccountingPoliciesPolicies"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended" id="ia13cfb3eb2b843f4a58cdc925c4bf40f_SummaryofSignificantAccountingPoliciesPolicies"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#SummaryofSignificantAccountingPoliciesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesTables" xlink:type="extended" id="i0cca526c23474f09b165c4298e46c9fc_SummaryofSignificantAccountingPoliciesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" id="i2442cd9be42b4861ac45eb3e76afd332_SummaryofSignificantAccountingPoliciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NumberOfMarketableSecuritiesHeld_03f5be64-a4fb-4a1d-a3df-af88fe543e53" xlink:href="crwd-20200731.xsd#crwd_NumberOfMarketableSecuritiesHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:to="loc_crwd_NumberOfMarketableSecuritiesHeld_03f5be64-a4fb-4a1d-a3df-af88fe543e53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_36a19542-c818-4066-9a3e-20da0a9de566" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_36a19542-c818-4066-9a3e-20da0a9de566" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_8d5a335d-cfc0-461a-959c-46ff20cec909" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_8d5a335d-cfc0-461a-959c-46ff20cec909" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_4cb304e3-483e-473e-aea5-03887c4e432a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_4cb304e3-483e-473e-aea5-03887c4e432a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_924fa92e-6715-4d8c-9485-a66fdf1a6050" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:to="loc_us-gaap_OperatingLeaseLiability_924fa92e-6715-4d8c-9485-a66fdf1a6050" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_00c895d6-53eb-402e-a4ba-2254d8871406" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_00c895d6-53eb-402e-a4ba-2254d8871406" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_bde91efe-8e8b-421d-adb9-30c372243969" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_cfdb8095-23b1-4814-9a27-1b72e2904009" xlink:to="loc_us-gaap_ConcentrationRiskTable_bde91efe-8e8b-421d-adb9-30c372243969" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_50743b48-5746-4a0f-b623-64484f548d62" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_bde91efe-8e8b-421d-adb9-30c372243969" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_50743b48-5746-4a0f-b623-64484f548d62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_50743b48-5746-4a0f-b623-64484f548d62_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_50743b48-5746-4a0f-b623-64484f548d62" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_50743b48-5746-4a0f-b623-64484f548d62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_a23b312e-7533-445b-9570-ef158425d7e2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_50743b48-5746-4a0f-b623-64484f548d62" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_a23b312e-7533-445b-9570-ef158425d7e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_eaf88e9b-2dc8-4430-a427-96a8ab990bbf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a23b312e-7533-445b-9570-ef158425d7e2" xlink:to="loc_us-gaap_OtherLiabilitiesMember_eaf88e9b-2dc8-4430-a427-96a8ab990bbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_52bc6354-894c-4b55-9de0-6667fd9a0568" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_bde91efe-8e8b-421d-adb9-30c372243969" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_52bc6354-894c-4b55-9de0-6667fd9a0568" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_52bc6354-894c-4b55-9de0-6667fd9a0568_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_52bc6354-894c-4b55-9de0-6667fd9a0568" xlink:to="loc_us-gaap_TypeOfAdoptionMember_52bc6354-894c-4b55-9de0-6667fd9a0568_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_4a465e6e-7c72-4df9-ad8f-9aa5aad78e2c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_52bc6354-894c-4b55-9de0-6667fd9a0568" xlink:to="loc_us-gaap_TypeOfAdoptionMember_4a465e6e-7c72-4df9-ad8f-9aa5aad78e2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_affa72a4-553c-4062-9685-a4882dc04fbe" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_4a465e6e-7c72-4df9-ad8f-9aa5aad78e2c" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_affa72a4-553c-4062-9685-a4882dc04fbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_77181cfa-fe36-44c1-855b-8b71858b97d7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_bde91efe-8e8b-421d-adb9-30c372243969" xlink:to="loc_us-gaap_CreditFacilityAxis_77181cfa-fe36-44c1-855b-8b71858b97d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_77181cfa-fe36-44c1-855b-8b71858b97d7_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_77181cfa-fe36-44c1-855b-8b71858b97d7" xlink:to="loc_us-gaap_CreditFacilityDomain_77181cfa-fe36-44c1-855b-8b71858b97d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_fa268fc8-93be-4d27-9fc8-64c759e240dd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_77181cfa-fe36-44c1-855b-8b71858b97d7" xlink:to="loc_us-gaap_CreditFacilityDomain_fa268fc8-93be-4d27-9fc8-64c759e240dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_4c3c09b9-f549-4378-90ca-8f9fc5c4d202" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_fa268fc8-93be-4d27-9fc8-64c759e240dd" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_4c3c09b9-f549-4378-90ca-8f9fc5c4d202" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_7c6ef8c8-8088-4170-b020-4d0c4478630a" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_bde91efe-8e8b-421d-adb9-30c372243969" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_7c6ef8c8-8088-4170-b020-4d0c4478630a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_7c6ef8c8-8088-4170-b020-4d0c4478630a_default" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_7c6ef8c8-8088-4170-b020-4d0c4478630a" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_7c6ef8c8-8088-4170-b020-4d0c4478630a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_aa7cac28-9336-41e8-9455-00a5e7e25e69" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_7c6ef8c8-8088-4170-b020-4d0c4478630a" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_aa7cac28-9336-41e8-9455-00a5e7e25e69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_4d3edd93-bc93-4c90-9907-871f7b1e34b2" xlink:href="crwd-20200731.xsd#crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_aa7cac28-9336-41e8-9455-00a5e7e25e69" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_4d3edd93-bc93-4c90-9907-871f7b1e34b2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails" xlink:type="extended" id="i4b80412554fc48c88ba50916719e7d45_SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_2acf2037-7331-4f7a-9ad5-33e68b548c7a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_d629dbc8-bc47-4624-ac2c-a2ec87d441fb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_2acf2037-7331-4f7a-9ad5-33e68b548c7a" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_d629dbc8-bc47-4624-ac2c-a2ec87d441fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_629a54d5-fda0-43a3-acc7-2d63471581dc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_2acf2037-7331-4f7a-9ad5-33e68b548c7a" xlink:to="loc_us-gaap_ConcentrationRiskTable_629a54d5-fda0-43a3-acc7-2d63471581dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_8eedcaec-a216-4960-80c0-298f3ad2793b" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_629a54d5-fda0-43a3-acc7-2d63471581dc" xlink:to="loc_srt_MajorCustomersAxis_8eedcaec-a216-4960-80c0-298f3ad2793b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_8eedcaec-a216-4960-80c0-298f3ad2793b_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_8eedcaec-a216-4960-80c0-298f3ad2793b" xlink:to="loc_srt_NameOfMajorCustomerDomain_8eedcaec-a216-4960-80c0-298f3ad2793b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_bda818e7-fb2a-43c4-867b-67ab47748b76" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_8eedcaec-a216-4960-80c0-298f3ad2793b" xlink:to="loc_srt_NameOfMajorCustomerDomain_bda818e7-fb2a-43c4-867b-67ab47748b76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ChannelPartnerAMember_6a3f0341-45e0-4550-aaf0-c37b0e51bb84" xlink:href="crwd-20200731.xsd#crwd_ChannelPartnerAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_bda818e7-fb2a-43c4-867b-67ab47748b76" xlink:to="loc_crwd_ChannelPartnerAMember_6a3f0341-45e0-4550-aaf0-c37b0e51bb84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ChannelPartnerBMember_d77e29a9-c694-4c39-a087-d438255fd14b" xlink:href="crwd-20200731.xsd#crwd_ChannelPartnerBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_bda818e7-fb2a-43c4-867b-67ab47748b76" xlink:to="loc_crwd_ChannelPartnerBMember_d77e29a9-c694-4c39-a087-d438255fd14b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CustomerBMember_190fcf3b-3cb3-41ef-84fd-94fe1e91e3c5" xlink:href="crwd-20200731.xsd#crwd_CustomerBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_bda818e7-fb2a-43c4-867b-67ab47748b76" xlink:to="loc_crwd_CustomerBMember_190fcf3b-3cb3-41ef-84fd-94fe1e91e3c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_15d653e1-bd9a-421e-8a1b-f3626eb59de6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_629a54d5-fda0-43a3-acc7-2d63471581dc" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_15d653e1-bd9a-421e-8a1b-f3626eb59de6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_15d653e1-bd9a-421e-8a1b-f3626eb59de6_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_15d653e1-bd9a-421e-8a1b-f3626eb59de6" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_15d653e1-bd9a-421e-8a1b-f3626eb59de6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_958a3c8e-efb3-48e6-9654-22afa0160af1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_15d653e1-bd9a-421e-8a1b-f3626eb59de6" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_958a3c8e-efb3-48e6-9654-22afa0160af1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_695222c9-908e-41e7-9466-123d7240c8e6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_958a3c8e-efb3-48e6-9654-22afa0160af1" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_695222c9-908e-41e7-9466-123d7240c8e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DistributorConcentrationRiskMember_d570c9cc-c0a9-4638-ae17-fba0898bc5c5" xlink:href="crwd-20200731.xsd#crwd_DistributorConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_958a3c8e-efb3-48e6-9654-22afa0160af1" xlink:to="loc_crwd_DistributorConcentrationRiskMember_d570c9cc-c0a9-4638-ae17-fba0898bc5c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_844b52cc-63d9-40f7-8539-b6b205e945cf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_629a54d5-fda0-43a3-acc7-2d63471581dc" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_844b52cc-63d9-40f7-8539-b6b205e945cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_844b52cc-63d9-40f7-8539-b6b205e945cf_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_844b52cc-63d9-40f7-8539-b6b205e945cf" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_844b52cc-63d9-40f7-8539-b6b205e945cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_179d882a-6315-43d5-9d15-f73fbde7b5ec" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_844b52cc-63d9-40f7-8539-b6b205e945cf" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_179d882a-6315-43d5-9d15-f73fbde7b5ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_d8fc4051-fa1b-4796-823f-8695608b9381" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_179d882a-6315-43d5-9d15-f73fbde7b5ec" xlink:to="loc_us-gaap_AccountsReceivableMember_d8fc4051-fa1b-4796-823f-8695608b9381" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_d75db337-94ae-4186-9ee0-8aabb16e8abc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_179d882a-6315-43d5-9d15-f73fbde7b5ec" xlink:to="loc_us-gaap_SalesRevenueNetMember_d75db337-94ae-4186-9ee0-8aabb16e8abc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecurities" xlink:type="simple" xlink:href="crwd-20200731.xsd#FairValueMeasurementsandMarketableSecurities"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecurities" xlink:type="extended" id="ia358deadb6f44047959f38b213fb1f01_FairValueMeasurementsandMarketableSecurities"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#FairValueMeasurementsandMarketableSecuritiesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesTables" xlink:type="extended" id="i6bb180453f3c447a9fc7bc63cc098e08_FairValueMeasurementsandMarketableSecuritiesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails" xlink:type="extended" id="ie6e215b5386b41d8aa61670522b0645b_FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1e7a5298-edb5-49c5-a24d-fd9626775a86" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_3e219d63-c5c1-4d28-a78a-5080a7d7b8a9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1e7a5298-edb5-49c5-a24d-fd9626775a86" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_3e219d63-c5c1-4d28-a78a-5080a7d7b8a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_0810de35-20c3-4fea-9211-d59f48015308" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_3e219d63-c5c1-4d28-a78a-5080a7d7b8a9" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_0810de35-20c3-4fea-9211-d59f48015308" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_704f7968-584f-43d0-b2ab-81c92fb9ee8c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_3e219d63-c5c1-4d28-a78a-5080a7d7b8a9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_704f7968-584f-43d0-b2ab-81c92fb9ee8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_fee74060-add9-4342-8ce9-35fa7bf5db8a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_3e219d63-c5c1-4d28-a78a-5080a7d7b8a9" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_fee74060-add9-4342-8ce9-35fa7bf5db8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dc1ed91d-96a0-47a9-85b8-0335fa513370" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1e7a5298-edb5-49c5-a24d-fd9626775a86" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dc1ed91d-96a0-47a9-85b8-0335fa513370" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_04bd8a00-d126-4ccc-83af-9fc3c98a7313" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dc1ed91d-96a0-47a9-85b8-0335fa513370" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_04bd8a00-d126-4ccc-83af-9fc3c98a7313" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04bd8a00-d126-4ccc-83af-9fc3c98a7313_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_04bd8a00-d126-4ccc-83af-9fc3c98a7313" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_04bd8a00-d126-4ccc-83af-9fc3c98a7313_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f6c4a50-b010-48a5-bbfe-f8cacd0dae05" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_04bd8a00-d126-4ccc-83af-9fc3c98a7313" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f6c4a50-b010-48a5-bbfe-f8cacd0dae05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_98cdf1d1-ffe9-4945-9633-de5d0e2080e3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f6c4a50-b010-48a5-bbfe-f8cacd0dae05" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_98cdf1d1-ffe9-4945-9633-de5d0e2080e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_7572374c-ccec-420a-bc12-723616b215e0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f6c4a50-b010-48a5-bbfe-f8cacd0dae05" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_7572374c-ccec-420a-bc12-723616b215e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_845a0163-bcb0-4156-ad93-36fea37ffe0d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f6c4a50-b010-48a5-bbfe-f8cacd0dae05" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_845a0163-bcb0-4156-ad93-36fea37ffe0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9202b5e2-5a11-4bce-a280-b7bd1a3e5ea2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dc1ed91d-96a0-47a9-85b8-0335fa513370" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9202b5e2-5a11-4bce-a280-b7bd1a3e5ea2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9202b5e2-5a11-4bce-a280-b7bd1a3e5ea2_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9202b5e2-5a11-4bce-a280-b7bd1a3e5ea2" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9202b5e2-5a11-4bce-a280-b7bd1a3e5ea2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_b0680c51-4b64-492f-8ef7-86ad46b9a3fb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9202b5e2-5a11-4bce-a280-b7bd1a3e5ea2" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_b0680c51-4b64-492f-8ef7-86ad46b9a3fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_de02e1b9-8e8a-4ebe-8e0e-0ff1b65eefba" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_b0680c51-4b64-492f-8ef7-86ad46b9a3fb" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_de02e1b9-8e8a-4ebe-8e0e-0ff1b65eefba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_6414f363-2eca-477d-8114-dad3d9407fc8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_dc1ed91d-96a0-47a9-85b8-0335fa513370" xlink:to="loc_us-gaap_FinancialInstrumentAxis_6414f363-2eca-477d-8114-dad3d9407fc8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6414f363-2eca-477d-8114-dad3d9407fc8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_6414f363-2eca-477d-8114-dad3d9407fc8" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6414f363-2eca-477d-8114-dad3d9407fc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_be48d210-fd4e-4b59-8055-5cf8e1dfe06f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_6414f363-2eca-477d-8114-dad3d9407fc8" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_be48d210-fd4e-4b59-8055-5cf8e1dfe06f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_7cd3e8a1-022c-4da5-af8b-1e11b83810b7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_be48d210-fd4e-4b59-8055-5cf8e1dfe06f" xlink:to="loc_us-gaap_MoneyMarketFundsMember_7cd3e8a1-022c-4da5-af8b-1e11b83810b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_1a99dd8f-b9e6-424c-a4e7-c2150924223e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_be48d210-fd4e-4b59-8055-5cf8e1dfe06f" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_1a99dd8f-b9e6-424c-a4e7-c2150924223e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_334aad35-7be1-4a64-9330-eaa60f5d08d1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_be48d210-fd4e-4b59-8055-5cf8e1dfe06f" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_334aad35-7be1-4a64-9330-eaa60f5d08d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_d4d69b73-a848-4820-a9a9-b29a2f25f9e2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_be48d210-fd4e-4b59-8055-5cf8e1dfe06f" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_d4d69b73-a848-4820-a9a9-b29a2f25f9e2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesMaturitiesDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#FairValueMeasuresandMarketableSecuritiesMaturitiesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesMaturitiesDetails" xlink:type="extended" id="i1932bf841f4140fd95e4c06d216b8046_FairValueMeasuresandMarketableSecuritiesMaturitiesDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails" xlink:type="extended" id="i853bfad5870241bb9410abc61bfd7c9d_FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_64e979b9-1294-4cc1-b817-362f1acb8d15" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentAggregateCost_1d80fcd0-1b2c-4a2b-a335-efb9dd5f4164" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestmentAggregateCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_64e979b9-1294-4cc1-b817-362f1acb8d15" xlink:to="loc_us-gaap_EquityMethodInvestmentAggregateCost_1d80fcd0-1b2c-4a2b-a335-efb9dd5f4164" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_e65021d1-6985-4914-ae05-037951bb201a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_64e979b9-1294-4cc1-b817-362f1acb8d15" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_e65021d1-6985-4914-ae05-037951bb201a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_f8ac959d-50c4-4abb-a347-f319ccc6d096" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_64e979b9-1294-4cc1-b817-362f1acb8d15" xlink:to="loc_us-gaap_EquityMethodInvestments_f8ac959d-50c4-4abb-a347-f319ccc6d096" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_afd412a9-fbe6-4e55-8d53-b375080fef96" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_64e979b9-1294-4cc1-b817-362f1acb8d15" xlink:to="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_afd412a9-fbe6-4e55-8d53-b375080fef96" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_7f761f72-4783-47d5-9b44-fe9711772be8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_afd412a9-fbe6-4e55-8d53-b375080fef96" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_7f761f72-4783-47d5-9b44-fe9711772be8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_7f761f72-4783-47d5-9b44-fe9711772be8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_7f761f72-4783-47d5-9b44-fe9711772be8" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_7f761f72-4783-47d5-9b44-fe9711772be8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1c670e4b-f412-4b7b-b0e4-8ef9b5dd5682" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_7f761f72-4783-47d5-9b44-fe9711772be8" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1c670e4b-f412-4b7b-b0e4-8ef9b5dd5682" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_57436411-e67a-47cc-bb68-4b702aba1a65" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1c670e4b-f412-4b7b-b0e4-8ef9b5dd5682" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_57436411-e67a-47cc-bb68-4b702aba1a65" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails" xlink:type="extended" id="i4deebc2082074bb89e32a108ab0196fb_FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_7988bf88-05e5-4e3f-bc53-c6daa457f708" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfInvestments_231f6896-9dff-4d87-b3f5-80949ed65e49" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairmentOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_7988bf88-05e5-4e3f-bc53-c6daa457f708" xlink:to="loc_us-gaap_ImpairmentOfInvestments_231f6896-9dff-4d87-b3f5-80949ed65e49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_c7671ecc-224e-4be6-95cd-e6b1e48a36ba" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_7988bf88-05e5-4e3f-bc53-c6daa457f708" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_c7671ecc-224e-4be6-95cd-e6b1e48a36ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ConversionOfWarrantsWarrantsIssued_2102eba1-91cc-4c8f-a35f-3357e14556f4" xlink:href="crwd-20200731.xsd#crwd_ConversionOfWarrantsWarrantsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_7988bf88-05e5-4e3f-bc53-c6daa457f708" xlink:to="loc_crwd_ConversionOfWarrantsWarrantsIssued_2102eba1-91cc-4c8f-a35f-3357e14556f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_874c6421-c890-41b4-9148-1acbc502ffd4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_7988bf88-05e5-4e3f-bc53-c6daa457f708" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_874c6421-c890-41b4-9148-1acbc502ffd4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_9d650da8-ce67-49c4-9a3d-e12392517390" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_874c6421-c890-41b4-9148-1acbc502ffd4" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_9d650da8-ce67-49c4-9a3d-e12392517390" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9d650da8-ce67-49c4-9a3d-e12392517390_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_9d650da8-ce67-49c4-9a3d-e12392517390" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9d650da8-ce67-49c4-9a3d-e12392517390_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_57e345ce-8c45-4822-88d8-4f61cd200d63" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_9d650da8-ce67-49c4-9a3d-e12392517390" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_57e345ce-8c45-4822-88d8-4f61cd200d63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_6c56290a-1c50-4896-a95d-44b01d2e1833" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_57e345ce-8c45-4822-88d8-4f61cd200d63" xlink:to="loc_us-gaap_IPOMember_6c56290a-1c50-4896-a95d-44b01d2e1833" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_2f6533df-f0e5-4773-82af-70222fbd3bf9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_874c6421-c890-41b4-9148-1acbc502ffd4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_2f6533df-f0e5-4773-82af-70222fbd3bf9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_2f6533df-f0e5-4773-82af-70222fbd3bf9_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2f6533df-f0e5-4773-82af-70222fbd3bf9" xlink:to="loc_us-gaap_ClassOfStockDomain_2f6533df-f0e5-4773-82af-70222fbd3bf9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_fcf39c0f-2569-4b0f-9f6d-a59ab8670a60" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2f6533df-f0e5-4773-82af-70222fbd3bf9" xlink:to="loc_us-gaap_ClassOfStockDomain_fcf39c0f-2569-4b0f-9f6d-a59ab8670a60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_b7030bbc-7d41-4925-b98f-955eb6344b10" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_fcf39c0f-2569-4b0f-9f6d-a59ab8670a60" xlink:to="loc_us-gaap_CommonClassBMember_b7030bbc-7d41-4925-b98f-955eb6344b10" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails" xlink:type="extended" id="i2aaa2ef0dc844082adf4ea5249c951f6_FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_fc130243-e2b6-4721-9b45-8c8f01d8bc1e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_6c60a553-04fd-4715-bb8f-8f8544964314" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_fc130243-e2b6-4721-9b45-8c8f01d8bc1e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_6c60a553-04fd-4715-bb8f-8f8544964314" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_70ecc424-cb04-4098-816b-ec333e23afb2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_6c60a553-04fd-4715-bb8f-8f8544964314" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_70ecc424-cb04-4098-816b-ec333e23afb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_6f709da5-c666-48e1-914d-6a1dc7357089" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_6c60a553-04fd-4715-bb8f-8f8544964314" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_6f709da5-c666-48e1-914d-6a1dc7357089" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_6c5c8d66-cb22-47b0-af4a-9d0c0c0431ce" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_6c60a553-04fd-4715-bb8f-8f8544964314" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_6c5c8d66-cb22-47b0-af4a-9d0c0c0431ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_d02ed7a5-7367-4790-bbd8-9a57b198b25c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_3e9734e0-6d27-4daf-afcf-4ed2771dc6e0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_fc130243-e2b6-4721-9b45-8c8f01d8bc1e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_3e9734e0-6d27-4daf-afcf-4ed2771dc6e0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2bca8abc-8031-4501-b7ad-8ef148489704" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_3e9734e0-6d27-4daf-afcf-4ed2771dc6e0" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2bca8abc-8031-4501-b7ad-8ef148489704" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2bca8abc-8031-4501-b7ad-8ef148489704_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2bca8abc-8031-4501-b7ad-8ef148489704" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2bca8abc-8031-4501-b7ad-8ef148489704_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ecbef562-5d9c-42a8-b792-88419526a680" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2bca8abc-8031-4501-b7ad-8ef148489704" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ecbef562-5d9c-42a8-b792-88419526a680" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_b131406e-b83b-4bfc-b0d1-ef5f0a417c02" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ecbef562-5d9c-42a8-b792-88419526a680" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_b131406e-b83b-4bfc-b0d1-ef5f0a417c02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_cd29a979-53a2-4de5-a92e-1ea09726234e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_3e9734e0-6d27-4daf-afcf-4ed2771dc6e0" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_cd29a979-53a2-4de5-a92e-1ea09726234e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_cd29a979-53a2-4de5-a92e-1ea09726234e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_cd29a979-53a2-4de5-a92e-1ea09726234e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_cd29a979-53a2-4de5-a92e-1ea09726234e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7e582ac2-a1dd-443d-8494-0ae76f02c770" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_cd29a979-53a2-4de5-a92e-1ea09726234e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7e582ac2-a1dd-443d-8494-0ae76f02c770" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RedeemableConvertiblePreferredStockWarrantsMember_c823ecb0-93a8-41a1-a284-b08ff39f0f9d" xlink:href="crwd-20200731.xsd#crwd_RedeemableConvertiblePreferredStockWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_7e582ac2-a1dd-443d-8494-0ae76f02c770" xlink:to="loc_crwd_RedeemableConvertiblePreferredStockWarrantsMember_c823ecb0-93a8-41a1-a284-b08ff39f0f9d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponents" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponents"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponents" xlink:type="extended" id="i6150a6b73ac34de38d810436d8b89a77_BalanceSheetComponents"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponentsTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsTables" xlink:type="extended" id="i36180754fdfb4671a810f6ab08a810c7_BalanceSheetComponentsTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails" xlink:type="extended" id="ia7ca4437bcd64806b2f71fb122e08cac_BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsPropertyandEquipmentNetDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponentsPropertyandEquipmentNetDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsPropertyandEquipmentNetDetails" xlink:type="extended" id="ib361f3c8adcb4b388cf1dd296bdfc798_BalanceSheetComponentsPropertyandEquipmentNetDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8cafe726-c278-4f9c-872a-10074e816bf2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_83a03999-7ed7-4929-9b16-d39ad429ed4a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8cafe726-c278-4f9c-872a-10074e816bf2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_83a03999-7ed7-4929-9b16-d39ad429ed4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_b7299b3f-21b3-4314-8fbb-1ccbac492872" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8cafe726-c278-4f9c-872a-10074e816bf2" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_b7299b3f-21b3-4314-8fbb-1ccbac492872" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_962d2667-1a13-4610-8cd6-099099f53bcb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8cafe726-c278-4f9c-872a-10074e816bf2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_962d2667-1a13-4610-8cd6-099099f53bcb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f951e551-d56c-4214-9952-f177d4545bee" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8cafe726-c278-4f9c-872a-10074e816bf2" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f951e551-d56c-4214-9952-f177d4545bee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_af847810-d0e8-4ac8-8aef-9db066446329" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f951e551-d56c-4214-9952-f177d4545bee" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_af847810-d0e8-4ac8-8aef-9db066446329" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_af847810-d0e8-4ac8-8aef-9db066446329_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_af847810-d0e8-4ac8-8aef-9db066446329" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_af847810-d0e8-4ac8-8aef-9db066446329_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_af847810-d0e8-4ac8-8aef-9db066446329" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DataCenterAndOtherComputerEquipmentMember_60452bd1-f375-4735-afcd-53ed837babfb" xlink:href="crwd-20200731.xsd#crwd_DataCenterAndOtherComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:to="loc_crwd_DataCenterAndOtherComputerEquipmentMember_60452bd1-f375-4735-afcd-53ed837babfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_75378a2a-b72b-447d-850f-3da0c18bd4bc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_75378a2a-b72b-447d-850f-3da0c18bd4bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_8e8f7dad-af19-44ee-b1d6-5c372a595b37" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_8e8f7dad-af19-44ee-b1d6-5c372a595b37" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PurchasedSoftwareMember_ae2f7dac-620d-4076-9374-9417c4d2feaa" xlink:href="crwd-20200731.xsd#crwd_PurchasedSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:to="loc_crwd_PurchasedSoftwareMember_ae2f7dac-620d-4076-9374-9417c4d2feaa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_FurnitureAndEquipmentMember_91b22956-9b4f-480a-8a56-2692154d885a" xlink:href="crwd-20200731.xsd#crwd_FurnitureAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:to="loc_crwd_FurnitureAndEquipmentMember_91b22956-9b4f-480a-8a56-2692154d885a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_af28fdce-d920-428d-98fe-34ca90310378" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f1856b8b-455f-49e1-8ad2-32d786916097" xlink:to="loc_us-gaap_ConstructionInProgressMember_af28fdce-d920-428d-98fe-34ca90310378" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponentsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="extended" id="i4287d57a0ec04a53baa9c7272b5ff5e4_BalanceSheetComponentsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EquipmentPurchasedButNotYetPlacedIntoService_3ed22521-6da3-4af1-b56f-f9ffce518107" xlink:href="crwd-20200731.xsd#crwd_EquipmentPurchasedButNotYetPlacedIntoService"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_crwd_EquipmentPurchasedButNotYetPlacedIntoService_3ed22521-6da3-4af1-b56f-f9ffce518107" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DepreciationAndAmortizationExcludingIntangibleAssetsAndDeferredContractAcquisitionCosts_234b545b-9f11-467f-87ed-c4467289613c" xlink:href="crwd-20200731.xsd#crwd_DepreciationAndAmortizationExcludingIntangibleAssetsAndDeferredContractAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_crwd_DepreciationAndAmortizationExcludingIntangibleAssetsAndDeferredContractAcquisitionCosts_234b545b-9f11-467f-87ed-c4467289613c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareImpairments1_a4baf282-24ff-4675-ae78-7b4807f1ce53" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareImpairments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareImpairments1_a4baf282-24ff-4675-ae78-7b4807f1ce53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAdditions_bf6eaaf9-c553-405f-87ce-78a96bcf7d10" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAdditions_bf6eaaf9-c553-405f-87ce-78a96bcf7d10" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_9e938676-d810-4066-9453-a6f6c1edfa20" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_9e938676-d810-4066-9453-a6f6c1edfa20" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_6534b016-dd06-4f8d-ad23-990fcb08d4ea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_6534b016-dd06-4f8d-ad23-990fcb08d4ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_8fa917f7-be2f-434f-afc4-3640ee11651f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_8fa917f7-be2f-434f-afc4-3640ee11651f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_b2678de8-8e33-410b-a5ae-5ec9b953b6b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_b2678de8-8e33-410b-a5ae-5ec9b953b6b3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f25969a9-a498-41c7-867f-6a2fe3d2de0b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2baef214-61a7-40f9-bc24-10546401de87" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f25969a9-a498-41c7-867f-6a2fe3d2de0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_1d72f494-60ed-468e-b174-9af75aba694c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f25969a9-a498-41c7-867f-6a2fe3d2de0b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_1d72f494-60ed-468e-b174-9af75aba694c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1d72f494-60ed-468e-b174-9af75aba694c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_1d72f494-60ed-468e-b174-9af75aba694c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1d72f494-60ed-468e-b174-9af75aba694c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_814d5847-4d0e-4d99-9440-57a167286c48" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_1d72f494-60ed-468e-b174-9af75aba694c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_814d5847-4d0e-4d99-9440-57a167286c48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_c5f2f23c-10f9-4348-bd54-86a4d01647c5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_814d5847-4d0e-4d99-9440-57a167286c48" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_c5f2f23c-10f9-4348-bd54-86a4d01647c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_c48b906e-7147-46f3-8909-9e9070293b14" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_814d5847-4d0e-4d99-9440-57a167286c48" xlink:to="loc_us-gaap_CustomerRelationshipsMember_c48b906e-7147-46f3-8909-9e9070293b14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_119de8f1-b6db-4b4c-a813-3b11201e58d8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_814d5847-4d0e-4d99-9440-57a167286c48" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_119de8f1-b6db-4b4c-a813-3b11201e58d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e32a4766-f1aa-4bde-942c-35dc0da30269" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f25969a9-a498-41c7-867f-6a2fe3d2de0b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e32a4766-f1aa-4bde-942c-35dc0da30269" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e32a4766-f1aa-4bde-942c-35dc0da30269_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e32a4766-f1aa-4bde-942c-35dc0da30269" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e32a4766-f1aa-4bde-942c-35dc0da30269_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c9b898a7-8b0b-4011-8b49-c6891606f552" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e32a4766-f1aa-4bde-942c-35dc0da30269" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c9b898a7-8b0b-4011-8b49-c6891606f552" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DataCenterAndOtherComputerEquipmentMember_01a6eab1-d995-4dce-afd2-29269037811a" xlink:href="crwd-20200731.xsd#crwd_DataCenterAndOtherComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c9b898a7-8b0b-4011-8b49-c6891606f552" xlink:to="loc_crwd_DataCenterAndOtherComputerEquipmentMember_01a6eab1-d995-4dce-afd2-29269037811a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsIntangibleAssetsNetDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponentsIntangibleAssetsNetDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsIntangibleAssetsNetDetails" xlink:type="extended" id="i42d34fa2f93c43ab83f23fbf15d08d2a_BalanceSheetComponentsIntangibleAssetsNetDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b10ba7c7-c8c5-420a-b2b1-7a82c7155ee6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2dc742c7-2e0c-4ef2-a442-daf32112a05c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b10ba7c7-c8c5-420a-b2b1-7a82c7155ee6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2dc742c7-2e0c-4ef2-a442-daf32112a05c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_f2d4f9c6-6e34-4bc7-b8d0-e94b8b73727f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b10ba7c7-c8c5-420a-b2b1-7a82c7155ee6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_f2d4f9c6-6e34-4bc7-b8d0-e94b8b73727f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_def33e18-3e43-4342-bfad-36b2796499e7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b10ba7c7-c8c5-420a-b2b1-7a82c7155ee6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_def33e18-3e43-4342-bfad-36b2796499e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_2481acd3-3990-47e5-836c-930f8d3801b1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b10ba7c7-c8c5-420a-b2b1-7a82c7155ee6" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_2481acd3-3990-47e5-836c-930f8d3801b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_57fe1390-27ed-4606-a467-b98679b5675b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b10ba7c7-c8c5-420a-b2b1-7a82c7155ee6" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_57fe1390-27ed-4606-a467-b98679b5675b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_16856924-5dd3-4e0f-9cc8-a4db5973cfea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_57fe1390-27ed-4606-a467-b98679b5675b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_16856924-5dd3-4e0f-9cc8-a4db5973cfea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_16856924-5dd3-4e0f-9cc8-a4db5973cfea_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_16856924-5dd3-4e0f-9cc8-a4db5973cfea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_16856924-5dd3-4e0f-9cc8-a4db5973cfea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_df5889e0-ab3a-4f69-b741-c3b5ed9f7a23" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_16856924-5dd3-4e0f-9cc8-a4db5973cfea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_df5889e0-ab3a-4f69-b741-c3b5ed9f7a23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_7d016194-91b3-44a8-b315-225208d277d2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_df5889e0-ab3a-4f69-b741-c3b5ed9f7a23" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_7d016194-91b3-44a8-b315-225208d277d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_fcb2b492-c411-4765-8d53-74ed57c1c6e4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_df5889e0-ab3a-4f69-b741-c3b5ed9f7a23" xlink:to="loc_us-gaap_CustomerRelationshipsMember_fcb2b492-c411-4765-8d53-74ed57c1c6e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_b7358fd3-2291-41a0-b0e2-2d0dcc027801" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_df5889e0-ab3a-4f69-b741-c3b5ed9f7a23" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_b7358fd3-2291-41a0-b0e2-2d0dcc027801" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsFutureAmortizationExpenseDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponentsFutureAmortizationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsFutureAmortizationExpenseDetails" xlink:type="extended" id="if582b94026d941c885dcd11d26ffa268_BalanceSheetComponentsFutureAmortizationExpenseDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsAccruedExpensesDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#BalanceSheetComponentsAccruedExpensesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsAccruedExpensesDetails" xlink:type="extended" id="i838568404a8c47759fb65c461a61d271_BalanceSheetComponentsAccruedExpensesDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacility" xlink:type="simple" xlink:href="crwd-20200731.xsd#SecuredRevolvingCreditFacility"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacility" xlink:type="extended" id="i3492c3cf6adf47929a40a152b95cd43a_SecuredRevolvingCreditFacility"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacilityDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#SecuredRevolvingCreditFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacilityDetails" xlink:type="extended" id="i02d5d4d20cc14656b9c51aedbfbd0f9f_SecuredRevolvingCreditFacilityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1e7f9377-1d23-4a45-8335-9c6771b4fea1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1e7f9377-1d23-4a45-8335-9c6771b4fea1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineOfCreditFacilityIncrementalBorrowingCapacity_9e964b41-b99d-442f-b354-6c0816a45e58" xlink:href="crwd-20200731.xsd#crwd_LineOfCreditFacilityIncrementalBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_crwd_LineOfCreditFacilityIncrementalBorrowingCapacity_9e964b41-b99d-442f-b354-6c0816a45e58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForFirstFiscalYear_60e8ae2a-a1b0-47e3-8250-85b101249656" xlink:href="crwd-20200731.xsd#crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForFirstFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForFirstFiscalYear_60e8ae2a-a1b0-47e3-8250-85b101249656" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForSecondFiscalYear_5e10801d-46f0-4bf4-9da8-323b0adb6702" xlink:href="crwd-20200731.xsd#crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForSecondFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForSecondFiscalYear_5e10801d-46f0-4bf4-9da8-323b0adb6702" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineofCreditFacilityBorrowingCapacityMultipleFactorAfterSecondFiscalYear_23bccabf-958a-4b90-98a9-1435d356d9b7" xlink:href="crwd-20200731.xsd#crwd_LineofCreditFacilityBorrowingCapacityMultipleFactorAfterSecondFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_crwd_LineofCreditFacilityBorrowingCapacityMultipleFactorAfterSecondFiscalYear_23bccabf-958a-4b90-98a9-1435d356d9b7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0794af1b-fdcc-43d1-9821-7367166f8354" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0794af1b-fdcc-43d1-9821-7367166f8354" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_bdc76c0a-c2ad-4f35-a5bf-441304ce0c9a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_bdc76c0a-c2ad-4f35-a5bf-441304ce0c9a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_b264bb87-57a6-4a9a-96e9-745073e48305" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_us-gaap_LineOfCredit_b264bb87-57a6-4a9a-96e9-745073e48305" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_8b583d40-12cb-47da-b7e0-d0ff58a5e3aa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f82a5b96-cd75-4d51-a54c-16f13a0d6b4b" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_8b583d40-12cb-47da-b7e0-d0ff58a5e3aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_80ed8889-7463-4623-b213-56b0690044f0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_8b583d40-12cb-47da-b7e0-d0ff58a5e3aa" xlink:to="loc_us-gaap_CreditFacilityAxis_80ed8889-7463-4623-b213-56b0690044f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_80ed8889-7463-4623-b213-56b0690044f0_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_80ed8889-7463-4623-b213-56b0690044f0" xlink:to="loc_us-gaap_CreditFacilityDomain_80ed8889-7463-4623-b213-56b0690044f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ddb941b5-02e6-4b27-9209-0ce0065a147f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_80ed8889-7463-4623-b213-56b0690044f0" xlink:to="loc_us-gaap_CreditFacilityDomain_ddb941b5-02e6-4b27-9209-0ce0065a147f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_d4802b49-f509-481a-9f7d-ec223a6285c1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ddb941b5-02e6-4b27-9209-0ce0065a147f" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_d4802b49-f509-481a-9f7d-ec223a6285c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_e298fc51-8924-4d9a-9497-9cf0ff8b88f7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_d4802b49-f509-481a-9f7d-ec223a6285c1" xlink:to="loc_us-gaap_LetterOfCreditMember_e298fc51-8924-4d9a-9497-9cf0ff8b88f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SwinglineFacilityMember_9110f85c-deaa-4e16-a2c0-812b4d7da4dc" xlink:href="crwd-20200731.xsd#crwd_SwinglineFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_d4802b49-f509-481a-9f7d-ec223a6285c1" xlink:to="loc_crwd_SwinglineFacilityMember_9110f85c-deaa-4e16-a2c0-812b4d7da4dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EurodollarLoansMember_85793e27-8211-4137-bd99-fbb5d777a7be" xlink:href="crwd-20200731.xsd#crwd_EurodollarLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_d4802b49-f509-481a-9f7d-ec223a6285c1" xlink:to="loc_crwd_EurodollarLoansMember_85793e27-8211-4137-bd99-fbb5d777a7be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_AlternateBaseRateLoansMember_77646e28-2510-4544-a03b-d48aeb4ef758" xlink:href="crwd-20200731.xsd#crwd_AlternateBaseRateLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_d4802b49-f509-481a-9f7d-ec223a6285c1" xlink:to="loc_crwd_AlternateBaseRateLoansMember_77646e28-2510-4544-a03b-d48aeb4ef758" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_c0c44084-2590-4a60-8050-10686b22d862" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_8b583d40-12cb-47da-b7e0-d0ff58a5e3aa" xlink:to="loc_us-gaap_VariableRateAxis_c0c44084-2590-4a60-8050-10686b22d862" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_c0c44084-2590-4a60-8050-10686b22d862_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_c0c44084-2590-4a60-8050-10686b22d862" xlink:to="loc_us-gaap_VariableRateDomain_c0c44084-2590-4a60-8050-10686b22d862_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_39ce55ef-373e-4a59-940a-bebfe261629b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_c0c44084-2590-4a60-8050-10686b22d862" xlink:to="loc_us-gaap_VariableRateDomain_39ce55ef-373e-4a59-940a-bebfe261629b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_78301cb5-7fa3-4513-8fa2-f16b10d07a36" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_39ce55ef-373e-4a59-940a-bebfe261629b" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_78301cb5-7fa3-4513-8fa2-f16b10d07a36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_7b3d9a45-59a7-4e30-b8a1-495c571dbbaa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_39ce55ef-373e-4a59-940a-bebfe261629b" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_7b3d9a45-59a7-4e30-b8a1-495c571dbbaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EurodollarMember_d954c4d9-2c06-4e58-9268-9a12ceb3f9d2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EurodollarMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_39ce55ef-373e-4a59-940a-bebfe261629b" xlink:to="loc_us-gaap_EurodollarMember_d954c4d9-2c06-4e58-9268-9a12ceb3f9d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f5291c6b-9979-4b12-8c21-17e1003d72fb" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_8b583d40-12cb-47da-b7e0-d0ff58a5e3aa" xlink:to="loc_srt_RangeAxis_f5291c6b-9979-4b12-8c21-17e1003d72fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f5291c6b-9979-4b12-8c21-17e1003d72fb_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f5291c6b-9979-4b12-8c21-17e1003d72fb" xlink:to="loc_srt_RangeMember_f5291c6b-9979-4b12-8c21-17e1003d72fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e8c78a37-ae0e-4760-8889-e8ecae811474" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f5291c6b-9979-4b12-8c21-17e1003d72fb" xlink:to="loc_srt_RangeMember_e8c78a37-ae0e-4760-8889-e8ecae811474" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a2653337-ed7a-4f64-89a7-f7f24bf87ed9" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e8c78a37-ae0e-4760-8889-e8ecae811474" xlink:to="loc_srt_MinimumMember_a2653337-ed7a-4f64-89a7-f7f24bf87ed9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_bc848823-a6cd-4a6d-aab5-9fa245dcddd1" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e8c78a37-ae0e-4760-8889-e8ecae811474" xlink:to="loc_srt_MaximumMember_bc848823-a6cd-4a6d-aab5-9fa245dcddd1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/IncomeTaxes" xlink:type="simple" xlink:href="crwd-20200731.xsd#IncomeTaxes"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/IncomeTaxes" xlink:type="extended" id="ifeb837465425426383b0cd7bd6fc9ed1_IncomeTaxes"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#IncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/IncomeTaxesDetails" xlink:type="extended" id="i0a12b8b82df748889c0e43996174c608_IncomeTaxesDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/Leases" xlink:type="simple" xlink:href="crwd-20200731.xsd#Leases"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/Leases" xlink:type="extended" id="i39326ce9da1d40beab3c136f7eb08792_Leases"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#LeasesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesTables" xlink:type="extended" id="i5cff7fbd3100446abe0f23d77fd4f0f7_LeasesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesAdditionalInformationDetails" xlink:type="extended" id="id05c1cf4edc540e0aba432f18f8d2c64_LeasesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_c619bcfa-75fd-44cb-b6ca-5b7ebf494104" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_us-gaap_OperatingLeaseCost_c619bcfa-75fd-44cb-b6ca-5b7ebf494104" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_81d74c84-520f-464d-be09-9b7d43d8d12e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_us-gaap_SubleaseIncome_81d74c84-520f-464d-be09-9b7d43d8d12e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseAndRentalExpense_b6a64616-79e1-40bb-a5bf-e2676aa250bb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseAndRentalExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_us-gaap_LeaseAndRentalExpense_b6a64616-79e1-40bb-a5bf-e2676aa250bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_c8ec0313-3a43-4ceb-b0d6-1e7110ce9750" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_us-gaap_OperatingLeasePayments_c8ec0313-3a43-4ceb-b0d6-1e7110ce9750" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_OperatingLeaseLiabilitiesArisingFromObtainingOperatingRightOfUseAssets_050a55bc-e7b4-4157-94c3-c7ecf3fa5ccf" xlink:href="crwd-20200731.xsd#crwd_OperatingLeaseLiabilitiesArisingFromObtainingOperatingRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_crwd_OperatingLeaseLiabilitiesArisingFromObtainingOperatingRightOfUseAssets_050a55bc-e7b4-4157-94c3-c7ecf3fa5ccf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_76da3e05-e7fd-45dc-aa35-ed6311a9f824" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_76da3e05-e7fd-45dc-aa35-ed6311a9f824" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_2000b7c1-0ca2-4796-bdfd-d96f0b8d7953" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_2000b7c1-0ca2-4796-bdfd-d96f0b8d7953" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_5cd1d836-0dda-47be-b441-fcbc6b7eed8e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_52898980-2a9d-4549-a855-7623dc2d3ebd" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_5cd1d836-0dda-47be-b441-fcbc6b7eed8e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6e669b21-a02c-4ca0-aaaa-32f2c721056b" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_5cd1d836-0dda-47be-b441-fcbc6b7eed8e" xlink:to="loc_srt_RangeAxis_6e669b21-a02c-4ca0-aaaa-32f2c721056b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6e669b21-a02c-4ca0-aaaa-32f2c721056b_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6e669b21-a02c-4ca0-aaaa-32f2c721056b" xlink:to="loc_srt_RangeMember_6e669b21-a02c-4ca0-aaaa-32f2c721056b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_15406291-3f57-4351-be9d-59d5d8305f52" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6e669b21-a02c-4ca0-aaaa-32f2c721056b" xlink:to="loc_srt_RangeMember_15406291-3f57-4351-be9d-59d5d8305f52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_5640885b-efe3-4d69-b2ce-62a7565aa058" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_15406291-3f57-4351-be9d-59d5d8305f52" xlink:to="loc_srt_MinimumMember_5640885b-efe3-4d69-b2ce-62a7565aa058" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e646d799-c19e-48e8-b352-190f4a813d1a" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_15406291-3f57-4351-be9d-59d5d8305f52" xlink:to="loc_srt_MaximumMember_e646d799-c19e-48e8-b352-190f4a813d1a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesLeaseCostDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#LeasesLeaseCostDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesLeaseCostDetails" xlink:type="extended" id="i69489c04ec5842a3825eb30be452110b_LeasesLeaseCostDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#LeasesMaturitiesofOperatingLeaseLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="extended" id="ic22e29fb40aa473f8fc99e5d3d6034e7_LeasesMaturitiesofOperatingLeaseLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_0d3d2a7b-7219-4dd9-856d-a7148b850a4d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_0d3d2a7b-7219-4dd9-856d-a7148b850a4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_a0bf423b-f7d6-48e7-8d5d-e8bdbfa1c8ee" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_a0bf423b-f7d6-48e7-8d5d-e8bdbfa1c8ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_6e597850-3371-4667-a048-d67eebbd6f93" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_6e597850-3371-4667-a048-d67eebbd6f93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_12f651c0-feaf-47f1-beda-a69020e879b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_12f651c0-feaf-47f1-beda-a69020e879b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_6a0a0728-d8a3-4a3f-b14f-acef3c80834b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_6a0a0728-d8a3-4a3f-b14f-acef3c80834b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_7886ea38-51b9-4436-b6aa-31e6aee2936f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_7886ea38-51b9-4436-b6aa-31e6aee2936f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f51a659e-0d8a-4850-b0f3-559c574181cc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f51a659e-0d8a-4850-b0f3-559c574181cc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_29d6c689-0690-448a-b932-f06c73eeb4bb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_29d6c689-0690-448a-b932-f06c73eeb4bb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_e55c72af-55f4-4dce-a0d6-321f681cf05b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_OperatingLeaseLiability_e55c72af-55f4-4dce-a0d6-321f681cf05b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c8ca5de4-3892-43de-a29e-7ea16fa1cb42" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_3fefb418-2561-49fb-8b87-1e38bf8fc80f" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c8ca5de4-3892-43de-a29e-7ea16fa1cb42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e7182dcc-43cb-4821-a886-e0656cacb66f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c8ca5de4-3892-43de-a29e-7ea16fa1cb42" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e7182dcc-43cb-4821-a886-e0656cacb66f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e7182dcc-43cb-4821-a886-e0656cacb66f_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e7182dcc-43cb-4821-a886-e0656cacb66f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e7182dcc-43cb-4821-a886-e0656cacb66f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f0481790-9fa2-4e12-ab31-21271ee26ec7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_e7182dcc-43cb-4821-a886-e0656cacb66f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f0481790-9fa2-4e12-ab31-21271ee26ec7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RealEstateArrangementsMember_75b57294-6fc6-4621-a641-7efe1ecb923d" xlink:href="crwd-20200731.xsd#crwd_RealEstateArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f0481790-9fa2-4e12-ab31-21271ee26ec7" xlink:to="loc_crwd_RealEstateArrangementsMember_75b57294-6fc6-4621-a641-7efe1ecb923d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/EquityTransactions" xlink:type="simple" xlink:href="crwd-20200731.xsd#EquityTransactions"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/EquityTransactions" xlink:type="extended" id="ifd784d63c83d41099fce4d3d7e347c5e_EquityTransactions"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/EquityTransactionsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#EquityTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/EquityTransactionsDetails" xlink:type="extended" id="i1b9d5b90a799491984abb05f64922d24_EquityTransactionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_ed4b8c20-1366-47af-9191-3e89ed21a41a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_ed4b8c20-1366-47af-9191-3e89ed21a41a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_5729f4ec-fd94-4d5f-808d-e19538f31921" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_5729f4ec-fd94-4d5f-808d-e19538f31921" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_561343f1-9f5b-4fc2-b17d-95c6da896a8f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_561343f1-9f5b-4fc2-b17d-95c6da896a8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_4ce25b22-ed67-443c-9385-16d99b0f17bf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_4ce25b22-ed67-443c-9385-16d99b0f17bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NumberOfVotesPerShare_cbfbca8a-f5c9-4737-907a-7ab4b884156d" xlink:href="crwd-20200731.xsd#crwd_NumberOfVotesPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:to="loc_crwd_NumberOfVotesPerShare_cbfbca8a-f5c9-4737-907a-7ab4b884156d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockConversionCommonStockConversionRatio_f06fffe0-90f3-465c-926f-b9159856c8b5" xlink:href="crwd-20200731.xsd#crwd_StockConversionCommonStockConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:to="loc_crwd_StockConversionCommonStockConversionRatio_f06fffe0-90f3-465c-926f-b9159856c8b5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_8070699d-4c7a-4f3d-a270-483834feeecf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5f85b93-a4d9-4e3e-8a1f-400548cd289d" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_8070699d-4c7a-4f3d-a270-483834feeecf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_cd891f89-f9cb-4b20-af89-886189277af1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_8070699d-4c7a-4f3d-a270-483834feeecf" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_cd891f89-f9cb-4b20-af89-886189277af1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_cd891f89-f9cb-4b20-af89-886189277af1_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_cd891f89-f9cb-4b20-af89-886189277af1" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_cd891f89-f9cb-4b20-af89-886189277af1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9fd4242a-34d6-4d0d-893f-d262a4ac6b9f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_cd891f89-f9cb-4b20-af89-886189277af1" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9fd4242a-34d6-4d0d-893f-d262a4ac6b9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_66deaf69-54b8-4942-bafe-8324d184405e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9fd4242a-34d6-4d0d-893f-d262a4ac6b9f" xlink:to="loc_us-gaap_IPOMember_66deaf69-54b8-4942-bafe-8324d184405e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_a890dab1-2b90-4944-8e26-c37f5e1b1b31" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_8070699d-4c7a-4f3d-a270-483834feeecf" xlink:to="loc_us-gaap_StatementClassOfStockAxis_a890dab1-2b90-4944-8e26-c37f5e1b1b31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_a890dab1-2b90-4944-8e26-c37f5e1b1b31_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_a890dab1-2b90-4944-8e26-c37f5e1b1b31" xlink:to="loc_us-gaap_ClassOfStockDomain_a890dab1-2b90-4944-8e26-c37f5e1b1b31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_07ec2fb5-089b-4f2b-a112-d42d99b1cc96" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_a890dab1-2b90-4944-8e26-c37f5e1b1b31" xlink:to="loc_us-gaap_ClassOfStockDomain_07ec2fb5-089b-4f2b-a112-d42d99b1cc96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_2c8029ea-68f5-4caa-bd14-e01c3bad1d7f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_07ec2fb5-089b-4f2b-a112-d42d99b1cc96" xlink:to="loc_us-gaap_CommonClassAMember_2c8029ea-68f5-4caa-bd14-e01c3bad1d7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_0deac8dd-348f-4335-a29f-5060a45b276e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_07ec2fb5-089b-4f2b-a112-d42d99b1cc96" xlink:to="loc_us-gaap_CommonClassBMember_0deac8dd-348f-4335-a29f-5060a45b276e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensation" xlink:type="simple" xlink:href="crwd-20200731.xsd#StockBasedCompensation"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensation" xlink:type="extended" id="i10da7bdf194e49be87d041d8f52e2dbe_StockBasedCompensation"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#StockBasedCompensationTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationTables" xlink:type="extended" id="i27b504e93011467289f8944b33c2fa8f_StockBasedCompensationTables">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_92143746-7963-499a-89c0-df0ddd17ac18" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_01fa26c3-6df5-4563-baa4-1f09fdba15d1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_92143746-7963-499a-89c0-df0ddd17ac18" xlink:to="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_01fa26c3-6df5-4563-baa4-1f09fdba15d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_7d71cdf2-e66d-4fce-beec-6f6624c27129" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_92143746-7963-499a-89c0-df0ddd17ac18" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_7d71cdf2-e66d-4fce-beec-6f6624c27129" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_85eafacb-3874-4cd2-ac6f-5a9498ca7c24" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_92143746-7963-499a-89c0-df0ddd17ac18" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_85eafacb-3874-4cd2-ac6f-5a9498ca7c24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_5aa295f7-54d4-44c1-be69-8ecdca350468" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_92143746-7963-499a-89c0-df0ddd17ac18" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_5aa295f7-54d4-44c1-be69-8ecdca350468" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1528d22-4f08-4059-9109-b7f50a380dce" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_92143746-7963-499a-89c0-df0ddd17ac18" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1528d22-4f08-4059-9109-b7f50a380dce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b620cb5f-3fbc-4ed3-8f47-968f6ad6c708" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1528d22-4f08-4059-9109-b7f50a380dce" xlink:to="loc_us-gaap_AwardTypeAxis_b620cb5f-3fbc-4ed3-8f47-968f6ad6c708" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b620cb5f-3fbc-4ed3-8f47-968f6ad6c708_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b620cb5f-3fbc-4ed3-8f47-968f6ad6c708" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b620cb5f-3fbc-4ed3-8f47-968f6ad6c708_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aec4eadf-0b5e-4324-b3eb-2187ae2445b9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b620cb5f-3fbc-4ed3-8f47-968f6ad6c708" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aec4eadf-0b5e-4324-b3eb-2187ae2445b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_db6535ad-db97-4e76-957a-4e0c78f3787c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_aec4eadf-0b5e-4324-b3eb-2187ae2445b9" xlink:to="loc_us-gaap_EmployeeStockOptionMember_db6535ad-db97-4e76-957a-4e0c78f3787c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_b548c3bc-4b18-4d9d-95e3-129ee5c30cc4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1528d22-4f08-4059-9109-b7f50a380dce" xlink:to="loc_us-gaap_PlanNameAxis_b548c3bc-4b18-4d9d-95e3-129ee5c30cc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b548c3bc-4b18-4d9d-95e3-129ee5c30cc4_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_b548c3bc-4b18-4d9d-95e3-129ee5c30cc4" xlink:to="loc_us-gaap_PlanNameDomain_b548c3bc-4b18-4d9d-95e3-129ee5c30cc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_33e2a12e-9810-49fc-87b4-a3450a56b3c8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_b548c3bc-4b18-4d9d-95e3-129ee5c30cc4" xlink:to="loc_us-gaap_PlanNameDomain_33e2a12e-9810-49fc-87b4-a3450a56b3c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanMember_b04e7cbb-6891-4bd3-8785-28a3134dc210" xlink:href="crwd-20200731.xsd#crwd_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_33e2a12e-9810-49fc-87b4-a3450a56b3c8" xlink:to="loc_crwd_EmployeeStockPurchasePlanMember_b04e7cbb-6891-4bd3-8785-28a3134dc210" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#StockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationDetails" xlink:type="extended" id="ib25ad657043b4184ac64c3308384b798_StockBasedCompensationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_d60e54d2-d250-448b-9990-7fa921a8802a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_d60e54d2-d250-448b-9990-7fa921a8802a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_9abd5c10-cbd9-44d0-b260-2ccd18abebfb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_9abd5c10-cbd9-44d0-b260-2ccd18abebfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_1b0f1992-5abd-42e8-b571-4caa207b303a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_1b0f1992-5abd-42e8-b571-4caa207b303a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_127f0352-5aa4-487f-86a9-5f263bcb48c2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_127f0352-5aa4-487f-86a9-5f263bcb48c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_d7ce5769-37ad-47e5-837d-c38a6ec18eea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_d7ce5769-37ad-47e5-837d-c38a6ec18eea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_7fd9d3fc-9fcf-44be-bfdc-3c2e13c989fa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_7fd9d3fc-9fcf-44be-bfdc-3c2e13c989fa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_cb5046e3-e526-4f88-9e09-71700865747f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_cb5046e3-e526-4f88-9e09-71700865747f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_4c51c250-7cff-4b62-b5a1-574fc0199991" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_4c51c250-7cff-4b62-b5a1-574fc0199991" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_247aac4c-c2a2-4bc1-8e7b-dce64fbcbe80" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_247aac4c-c2a2-4bc1-8e7b-dce64fbcbe80" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_016fa14f-9aaa-41b8-9e2c-57082b8334d7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_016fa14f-9aaa-41b8-9e2c-57082b8334d7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_30a6122c-64fd-497a-8543-df15f1380a17" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_30a6122c-64fd-497a-8543-df15f1380a17" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesEarlyExerciseOfEmployeeOptions_a3e7fa97-d15e-4fe1-86a6-836039bd36a3" xlink:href="crwd-20200731.xsd#crwd_StockIssuedDuringPeriodSharesEarlyExerciseOfEmployeeOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesEarlyExerciseOfEmployeeOptions_a3e7fa97-d15e-4fe1-86a6-836039bd36a3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_7ccab495-c70b-4baf-b6f0-8137af046757" xlink:href="crwd-20200731.xsd#crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_7ccab495-c70b-4baf-b6f0-8137af046757" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNumberOfSharesRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_93926c1a-677d-4eed-bcfd-abe20e1724c8" xlink:href="crwd-20200731.xsd#crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNumberOfSharesRelatedToEarlyExercisedStockOptionsSubjectToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNumberOfSharesRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_93926c1a-677d-4eed-bcfd-abe20e1724c8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsValueRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_fafd8b15-71e4-4f0d-a21b-f8627d596e90" xlink:href="crwd-20200731.xsd#crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsValueRelatedToEarlyExercisedStockOptionsSubjectToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsValueRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_fafd8b15-71e4-4f0d-a21b-f8627d596e90" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_VestingScheduleNumber_1d33471b-ed03-40dc-af6f-c8f9d7b63f53" xlink:href="crwd-20200731.xsd#crwd_VestingScheduleNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_VestingScheduleNumber_1d33471b-ed03-40dc-af6f-c8f9d7b63f53" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_13c44322-ad89-445a-b957-ec732075d579" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_13c44322-ad89-445a-b957-ec732075d579" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfQuarterlyInstallments_f035a7e6-5c3e-4339-a625-6a2c1ac61064" xlink:href="crwd-20200731.xsd#crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfQuarterlyInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfQuarterlyInstallments_f035a7e6-5c3e-4339-a625-6a2c1ac61064" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_70bbd9d9-e768-4b1f-8f48-e380393569ef" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_70bbd9d9-e768-4b1f-8f48-e380393569ef" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_367f7409-a05d-4b2a-8de9-99da6aa05e78" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_367f7409-a05d-4b2a-8de9-99da6aa05e78" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5b09c6fa-4770-46f6-a930-48a6557aa91b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_f547ed8c-6d91-4f3b-a741-94b4e96aee39" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_f547ed8c-6d91-4f3b-a741-94b4e96aee39" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_d8f66caa-c8f3-4c8e-b87a-231b0b16edea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanOfferingPeriod_0f4cc1a4-f345-4727-a07e-43b3f83fcf4a" xlink:href="crwd-20200731.xsd#crwd_EmployeeStockPurchasePlanOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_EmployeeStockPurchasePlanOfferingPeriod_0f4cc1a4-f345-4727-a07e-43b3f83fcf4a" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanNumberOfPurchasePeriod_1d1e38aa-9e83-41cc-98c7-43f5950ba505" xlink:href="crwd-20200731.xsd#crwd_EmployeeStockPurchasePlanNumberOfPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_EmployeeStockPurchasePlanNumberOfPurchasePeriod_1d1e38aa-9e83-41cc-98c7-43f5950ba505" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanDurationOfPurchasePeriod_7e147e7b-da21-4db8-ae59-e395f672f033" xlink:href="crwd-20200731.xsd#crwd_EmployeeStockPurchasePlanDurationOfPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_EmployeeStockPurchasePlanDurationOfPurchasePeriod_7e147e7b-da21-4db8-ae59-e395f672f033" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanPercentageOfEligibleCompensation_05334f97-df97-49f7-9334-35f08bf30a94" xlink:href="crwd-20200731.xsd#crwd_EmployeeStockPurchasePlanPercentageOfEligibleCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_EmployeeStockPurchasePlanPercentageOfEligibleCompensation_05334f97-df97-49f7-9334-35f08bf30a94" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_MaximumNumberOfSharesEachParticipantCanPurchaseDuringPurchasePeriod_3b010e7e-17f8-485b-b431-e902d7787993" xlink:href="crwd-20200731.xsd#crwd_MaximumNumberOfSharesEachParticipantCanPurchaseDuringPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_MaximumNumberOfSharesEachParticipantCanPurchaseDuringPurchasePeriod_3b010e7e-17f8-485b-b431-e902d7787993" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_97a7d49e-76a9-40db-b2da-3a94e1ca3a56" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_97a7d49e-76a9-40db-b2da-3a94e1ca3a56" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_a151e19a-89a0-4d74-842a-1ae2989937a9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_a151e19a-89a0-4d74-842a-1ae2989937a9" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedPaymentArrangementPlanModificationNumberOfContributionChanges_901fb569-a544-4294-aada-55fe8e4d7c17" xlink:href="crwd-20200731.xsd#crwd_ShareBasedPaymentArrangementPlanModificationNumberOfContributionChanges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_crwd_ShareBasedPaymentArrangementPlanModificationNumberOfContributionChanges_901fb569-a544-4294-aada-55fe8e4d7c17" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_8068a11f-d136-4e55-bf8b-b6a150cdf226" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_8068a11f-d136-4e55-bf8b-b6a150cdf226" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_269b5eb9-cd1f-4863-af87-9ad7dac6efc6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba590645-f915-4393-94f1-b1a073183ce4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_269b5eb9-cd1f-4863-af87-9ad7dac6efc6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_0eedae0e-7993-4861-8001-6dda7b26aa04" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_269b5eb9-cd1f-4863-af87-9ad7dac6efc6" xlink:to="loc_us-gaap_VestingAxis_0eedae0e-7993-4861-8001-6dda7b26aa04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_0eedae0e-7993-4861-8001-6dda7b26aa04_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_0eedae0e-7993-4861-8001-6dda7b26aa04" xlink:to="loc_us-gaap_VestingDomain_0eedae0e-7993-4861-8001-6dda7b26aa04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_6b643abf-0d19-408a-ac1e-5a0e5966323e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_0eedae0e-7993-4861-8001-6dda7b26aa04" xlink:to="loc_us-gaap_VestingDomain_6b643abf-0d19-408a-ac1e-5a0e5966323e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_caeb7c16-c89f-4b37-b2d4-34ff3a873755" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_6b643abf-0d19-408a-ac1e-5a0e5966323e" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_caeb7c16-c89f-4b37-b2d4-34ff3a873755" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_5a70c9e6-98c5-4aba-92a7-4095f49c1259" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_6b643abf-0d19-408a-ac1e-5a0e5966323e" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_5a70c9e6-98c5-4aba-92a7-4095f49c1259" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_5eb6995f-621e-4bf8-8d8e-714df2646e7f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_6b643abf-0d19-408a-ac1e-5a0e5966323e" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_5eb6995f-621e-4bf8-8d8e-714df2646e7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_54db541d-24c4-460d-92aa-20542b2c671b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_269b5eb9-cd1f-4863-af87-9ad7dac6efc6" xlink:to="loc_us-gaap_AwardTypeAxis_54db541d-24c4-460d-92aa-20542b2c671b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54db541d-24c4-460d-92aa-20542b2c671b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_54db541d-24c4-460d-92aa-20542b2c671b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_54db541d-24c4-460d-92aa-20542b2c671b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7443fb82-b4be-4d7a-bb97-5ba231f34bfa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_54db541d-24c4-460d-92aa-20542b2c671b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7443fb82-b4be-4d7a-bb97-5ba231f34bfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ServiceBasedRestrictedStockUnitsVestingMember_4fc9b3c9-d629-4c95-b1c9-285d20fe6c4a" xlink:href="crwd-20200731.xsd#crwd_ServiceBasedRestrictedStockUnitsVestingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7443fb82-b4be-4d7a-bb97-5ba231f34bfa" xlink:to="loc_crwd_ServiceBasedRestrictedStockUnitsVestingMember_4fc9b3c9-d629-4c95-b1c9-285d20fe6c4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_874070ed-9d23-4041-93f6-155773e952fd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7443fb82-b4be-4d7a-bb97-5ba231f34bfa" xlink:to="loc_us-gaap_EmployeeStockOptionMember_874070ed-9d23-4041-93f6-155773e952fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PerformanceBasedRestrictedStockUnitsVestingMember_40f4c790-84ca-450a-a674-d49b224201c6" xlink:href="crwd-20200731.xsd#crwd_PerformanceBasedRestrictedStockUnitsVestingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7443fb82-b4be-4d7a-bb97-5ba231f34bfa" xlink:to="loc_crwd_PerformanceBasedRestrictedStockUnitsVestingMember_40f4c790-84ca-450a-a674-d49b224201c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_bc5ec193-10f4-4515-8ef0-37d61c8fc141" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7443fb82-b4be-4d7a-bb97-5ba231f34bfa" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_bc5ec193-10f4-4515-8ef0-37d61c8fc141" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PerformanceBasedStockUnitsMember_f9691f1b-e8b4-4d4a-8c40-7e36cfe6b5d3" xlink:href="crwd-20200731.xsd#crwd_PerformanceBasedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7443fb82-b4be-4d7a-bb97-5ba231f34bfa" xlink:to="loc_crwd_PerformanceBasedStockUnitsMember_f9691f1b-e8b4-4d4a-8c40-7e36cfe6b5d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_cb117c96-3932-4897-98b9-4a8092a36b33" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_269b5eb9-cd1f-4863-af87-9ad7dac6efc6" xlink:to="loc_us-gaap_PlanNameAxis_cb117c96-3932-4897-98b9-4a8092a36b33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_cb117c96-3932-4897-98b9-4a8092a36b33_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_cb117c96-3932-4897-98b9-4a8092a36b33" xlink:to="loc_us-gaap_PlanNameDomain_cb117c96-3932-4897-98b9-4a8092a36b33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_86fcb428-c46f-4f6e-82a2-70d0d3897b45" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_cb117c96-3932-4897-98b9-4a8092a36b33" xlink:to="loc_us-gaap_PlanNameDomain_86fcb428-c46f-4f6e-82a2-70d0d3897b45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EquityIncentivePlan2019Member_78dd0b39-9d4d-43e6-9a19-e8e61fc239ee" xlink:href="crwd-20200731.xsd#crwd_EquityIncentivePlan2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_86fcb428-c46f-4f6e-82a2-70d0d3897b45" xlink:to="loc_crwd_EquityIncentivePlan2019Member_78dd0b39-9d4d-43e6-9a19-e8e61fc239ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanMember_730905a7-9012-4f29-802f-af2966225dc9" xlink:href="crwd-20200731.xsd#crwd_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_86fcb428-c46f-4f6e-82a2-70d0d3897b45" xlink:to="loc_crwd_EmployeeStockPurchasePlanMember_730905a7-9012-4f29-802f-af2966225dc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_0e5d52f5-3bd2-4073-a809-7db779332723" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_269b5eb9-cd1f-4863-af87-9ad7dac6efc6" xlink:to="loc_us-gaap_StatementClassOfStockAxis_0e5d52f5-3bd2-4073-a809-7db779332723" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_0e5d52f5-3bd2-4073-a809-7db779332723_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0e5d52f5-3bd2-4073-a809-7db779332723" xlink:to="loc_us-gaap_ClassOfStockDomain_0e5d52f5-3bd2-4073-a809-7db779332723_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_b538a1c9-80d4-4e57-b726-dc6e01531377" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0e5d52f5-3bd2-4073-a809-7db779332723" xlink:to="loc_us-gaap_ClassOfStockDomain_b538a1c9-80d4-4e57-b726-dc6e01531377" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_32c3d82f-152e-4d1c-adbd-f44dd3bc159a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_b538a1c9-80d4-4e57-b726-dc6e01531377" xlink:to="loc_us-gaap_CommonClassAMember_32c3d82f-152e-4d1c-adbd-f44dd3bc159a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e9f5351f-cb99-4417-9ae2-d4f7e56d629a" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_269b5eb9-cd1f-4863-af87-9ad7dac6efc6" xlink:to="loc_srt_RangeAxis_e9f5351f-cb99-4417-9ae2-d4f7e56d629a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e9f5351f-cb99-4417-9ae2-d4f7e56d629a_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e9f5351f-cb99-4417-9ae2-d4f7e56d629a" xlink:to="loc_srt_RangeMember_e9f5351f-cb99-4417-9ae2-d4f7e56d629a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_97663186-1c51-4ae1-94ce-df643d869ddb" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e9f5351f-cb99-4417-9ae2-d4f7e56d629a" xlink:to="loc_srt_RangeMember_97663186-1c51-4ae1-94ce-df643d869ddb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_31109df8-3034-4cda-af19-4098e5aa86fe" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_97663186-1c51-4ae1-94ce-df643d869ddb" xlink:to="loc_srt_MinimumMember_31109df8-3034-4cda-af19-4098e5aa86fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4c501555-7765-4e3a-a30d-17f04e7678d2" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_97663186-1c51-4ae1-94ce-df643d869ddb" xlink:to="loc_srt_MaximumMember_4c501555-7765-4e3a-a30d-17f04e7678d2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsAssumptionsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#StockBasedCompensationStockoptionsAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsAssumptionsDetails" xlink:type="extended" id="i613b5ed8997b4931a624044c0c5e100c_StockBasedCompensationStockoptionsAssumptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba85e843-60db-41c0-a54e-e7eb46a3a45a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_0475fdc1-a3b0-41b7-84c6-3a3487d8d417" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba85e843-60db-41c0-a54e-e7eb46a3a45a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_0475fdc1-a3b0-41b7-84c6-3a3487d8d417" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_3062d1d9-878d-422b-87b4-dcf5f534d782" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba85e843-60db-41c0-a54e-e7eb46a3a45a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_3062d1d9-878d-422b-87b4-dcf5f534d782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_a354da26-01f2-45a4-8223-644b36335dc9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba85e843-60db-41c0-a54e-e7eb46a3a45a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_a354da26-01f2-45a4-8223-644b36335dc9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_3b90bf0f-71ba-4ae9-84b9-19987dbb318d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba85e843-60db-41c0-a54e-e7eb46a3a45a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_3b90bf0f-71ba-4ae9-84b9-19987dbb318d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b0cfcbc8-7964-4f6d-bcfc-47ce737b21a7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ba85e843-60db-41c0-a54e-e7eb46a3a45a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b0cfcbc8-7964-4f6d-bcfc-47ce737b21a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_894f6414-273e-401e-bb3b-5e8d44f78f9c" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b0cfcbc8-7964-4f6d-bcfc-47ce737b21a7" xlink:to="loc_srt_RangeAxis_894f6414-273e-401e-bb3b-5e8d44f78f9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_894f6414-273e-401e-bb3b-5e8d44f78f9c_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_894f6414-273e-401e-bb3b-5e8d44f78f9c" xlink:to="loc_srt_RangeMember_894f6414-273e-401e-bb3b-5e8d44f78f9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c1fc167e-120f-4aaa-9360-7efd8baa9f00" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_894f6414-273e-401e-bb3b-5e8d44f78f9c" xlink:to="loc_srt_RangeMember_c1fc167e-120f-4aaa-9360-7efd8baa9f00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_64d0202f-96e5-44bc-a4d7-f11d86a211c9" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c1fc167e-120f-4aaa-9360-7efd8baa9f00" xlink:to="loc_srt_MinimumMember_64d0202f-96e5-44bc-a4d7-f11d86a211c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_77d7e080-7952-4f68-b214-956c70bcabf2" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c1fc167e-120f-4aaa-9360-7efd8baa9f00" xlink:to="loc_srt_MaximumMember_77d7e080-7952-4f68-b214-956c70bcabf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_2cde7133-763b-453a-99bf-6038eef4d455" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b0cfcbc8-7964-4f6d-bcfc-47ce737b21a7" xlink:to="loc_us-gaap_PlanNameAxis_2cde7133-763b-453a-99bf-6038eef4d455" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_2cde7133-763b-453a-99bf-6038eef4d455_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_2cde7133-763b-453a-99bf-6038eef4d455" xlink:to="loc_us-gaap_PlanNameDomain_2cde7133-763b-453a-99bf-6038eef4d455_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_44c00d4f-2404-4c30-a25f-509885fcbbe7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_2cde7133-763b-453a-99bf-6038eef4d455" xlink:to="loc_us-gaap_PlanNameDomain_44c00d4f-2404-4c30-a25f-509885fcbbe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanMember_3a9219ec-0b0c-4d0d-a7d6-4f7f183f57b3" xlink:href="crwd-20200731.xsd#crwd_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_44c00d4f-2404-4c30-a25f-509885fcbbe7" xlink:to="loc_crwd_EmployeeStockPurchasePlanMember_3a9219ec-0b0c-4d0d-a7d6-4f7f183f57b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_2e27e165-b924-4a6a-98e4-890a156567b5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b0cfcbc8-7964-4f6d-bcfc-47ce737b21a7" xlink:to="loc_us-gaap_AwardTypeAxis_2e27e165-b924-4a6a-98e4-890a156567b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2e27e165-b924-4a6a-98e4-890a156567b5_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_2e27e165-b924-4a6a-98e4-890a156567b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2e27e165-b924-4a6a-98e4-890a156567b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_256b9e98-3515-4712-a879-1710d24fe809" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_2e27e165-b924-4a6a-98e4-890a156567b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_256b9e98-3515-4712-a879-1710d24fe809" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_3558957c-64e6-4ea4-b3d9-54c10dcc3f44" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_256b9e98-3515-4712-a879-1710d24fe809" xlink:to="loc_us-gaap_EmployeeStockOptionMember_3558957c-64e6-4ea4-b3d9-54c10dcc3f44" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsSummaryDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#StockBasedCompensationStockoptionsSummaryDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsSummaryDetails" xlink:type="extended" id="ia2535fd762894f14aa2b6af82a75a39b_StockBasedCompensationStockoptionsSummaryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_094aed92-65fd-48f4-b2f5-d818b5524c32" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_094aed92-65fd-48f4-b2f5-d818b5524c32" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1349fbf6-d021-488f-8e02-540e2facc475" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1349fbf6-d021-488f-8e02-540e2facc475" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_6f44830d-a200-4c06-9050-879396ed498a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_6f44830d-a200-4c06-9050-879396ed498a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_482e6466-e97d-4a74-9063-2d9faae2b8a3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_482e6466-e97d-4a74-9063-2d9faae2b8a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_d4e95169-3014-49f2-bda1-7c89dadeae6c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_d4e95169-3014-49f2-bda1-7c89dadeae6c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_ededbb41-4c80-4c13-8a17-59929c4cdd0f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_1ef0126b-e59b-4276-8130-f6ee43a588c3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_1ef0126b-e59b-4276-8130-f6ee43a588c3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_aaafb128-f1ee-41ed-bb10-935ac4dafd6a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e9fb5262-919d-4a34-ac5f-98f798a265b8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_aaafb128-f1ee-41ed-bb10-935ac4dafd6a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_094aed92-65fd-48f4-b2f5-d818b5524c32" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8efae698-4921-40cc-869f-c3ccb2c8b3eb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8efae698-4921-40cc-869f-c3ccb2c8b3eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_fc5d4059-7f75-4bf3-98a5-d298b6f3daed" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_fc5d4059-7f75-4bf3-98a5-d298b6f3daed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_6e719127-5b21-48cc-906c-5810dc3bfc8e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_6e719127-5b21-48cc-906c-5810dc3bfc8e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_6e30049b-a938-4bdb-bb93-f81846fbbf38" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_6e30049b-a938-4bdb-bb93-f81846fbbf38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_467b0729-2554-4669-bf91-a4c2a3c5cca9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_0aedc2de-d975-4520-aaa1-5ef9a36ed71c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_0aedc2de-d975-4520-aaa1-5ef9a36ed71c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_2a182303-ddad-42a2-92be-14335d94b9b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_1166bd62-aaa7-427e-9ccd-963834e3564f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_2a182303-ddad-42a2-92be-14335d94b9b3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7fe3404d-7a2e-4305-b2db-98836a33d4fc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_094aed92-65fd-48f4-b2f5-d818b5524c32" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7fe3404d-7a2e-4305-b2db-98836a33d4fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_33222d5f-8a13-4685-a826-db69dfe11a65" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7fe3404d-7a2e-4305-b2db-98836a33d4fc" xlink:to="loc_us-gaap_AwardTypeAxis_33222d5f-8a13-4685-a826-db69dfe11a65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_33222d5f-8a13-4685-a826-db69dfe11a65_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_33222d5f-8a13-4685-a826-db69dfe11a65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_33222d5f-8a13-4685-a826-db69dfe11a65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_acebb300-41cc-45bc-a339-a342d8a61510" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_33222d5f-8a13-4685-a826-db69dfe11a65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_acebb300-41cc-45bc-a339-a342d8a61510" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_ba360bee-c31e-4e1e-b281-9edc9baccd69" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_acebb300-41cc-45bc-a339-a342d8a61510" xlink:to="loc_us-gaap_EmployeeStockOptionMember_ba360bee-c31e-4e1e-b281-9edc9baccd69" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationRSUactivityDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#StockBasedCompensationRSUactivityDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationRSUactivityDetails" xlink:type="extended" id="i929d1e1e85464386bf5f6a30c9d11d92_StockBasedCompensationRSUactivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_074bed71-25e2-4818-b4c9-bf01e89589bd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7055353d-997e-4aa1-838b-000751db0835" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_074bed71-25e2-4818-b4c9-bf01e89589bd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7055353d-997e-4aa1-838b-000751db0835" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_a82746b9-0b7c-4778-8588-1c73261f1371" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7055353d-997e-4aa1-838b-000751db0835" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_a82746b9-0b7c-4778-8588-1c73261f1371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_4a83334d-8038-488d-ac64-1e7fab227c7a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7055353d-997e-4aa1-838b-000751db0835" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_4a83334d-8038-488d-ac64-1e7fab227c7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_1bcb8af4-a42d-4495-a330-c7de34bb8b8b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7055353d-997e-4aa1-838b-000751db0835" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_1bcb8af4-a42d-4495-a330-c7de34bb8b8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_94cff53d-db92-4b80-9d03-6f14c511f671" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7055353d-997e-4aa1-838b-000751db0835" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_94cff53d-db92-4b80-9d03-6f14c511f671" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9d4b9cd2-ece5-4144-9845-d9c982af1686" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber_b08cb4b8-d3cb-464b-9d56-7701df5a4f2c" xlink:href="crwd-20200731.xsd#crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7055353d-997e-4aa1-838b-000751db0835" xlink:to="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber_b08cb4b8-d3cb-464b-9d56-7701df5a4f2c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c91412b7-f518-479b-aa45-4f83888445c1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_074bed71-25e2-4818-b4c9-bf01e89589bd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c91412b7-f518-479b-aa45-4f83888445c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_d7aca2c9-3ce6-4aa9-bb34-867116a68705" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c91412b7-f518-479b-aa45-4f83888445c1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_d7aca2c9-3ce6-4aa9-bb34-867116a68705" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_ff243c03-a500-4f5c-9431-46caa1080dca" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c91412b7-f518-479b-aa45-4f83888445c1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_ff243c03-a500-4f5c-9431-46caa1080dca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d42712aa-1035-4461-a663-a63a84ed30e8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c91412b7-f518-479b-aa45-4f83888445c1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d42712aa-1035-4461-a663-a63a84ed30e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_396e6455-617a-49e3-bec9-423a2e8041ba" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c91412b7-f518-479b-aa45-4f83888445c1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_396e6455-617a-49e3-bec9-423a2e8041ba" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_f128a423-3b1a-4a81-a137-cbc0b22e96ef" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_f345c6a0-3e00-4c91-8402-840c3a7039fa" xlink:href="crwd-20200731.xsd#crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c91412b7-f518-479b-aa45-4f83888445c1" xlink:to="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_f345c6a0-3e00-4c91-8402-840c3a7039fa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ed556440-31aa-43d6-adef-194eaea36c2f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_074bed71-25e2-4818-b4c9-bf01e89589bd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ed556440-31aa-43d6-adef-194eaea36c2f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_6c8fd132-d6e0-4585-8012-4d97b3f1cb0e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ed556440-31aa-43d6-adef-194eaea36c2f" xlink:to="loc_us-gaap_AwardTypeAxis_6c8fd132-d6e0-4585-8012-4d97b3f1cb0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6c8fd132-d6e0-4585-8012-4d97b3f1cb0e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_6c8fd132-d6e0-4585-8012-4d97b3f1cb0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6c8fd132-d6e0-4585-8012-4d97b3f1cb0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5bb9c024-9ea9-4b2a-aaa4-fa87015095fc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_6c8fd132-d6e0-4585-8012-4d97b3f1cb0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5bb9c024-9ea9-4b2a-aaa4-fa87015095fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RSUAndPSUMember_619458e0-b2b9-4c8f-a615-b12af6970c78" xlink:href="crwd-20200731.xsd#crwd_RSUAndPSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5bb9c024-9ea9-4b2a-aaa4-fa87015095fc" xlink:to="loc_crwd_RSUAndPSUMember_619458e0-b2b9-4c8f-a615-b12af6970c78" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#StockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationExpenseDetails" xlink:type="extended" id="i395069745c2345d7b094306ebe39d438_StockBasedCompensationExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7e439c32-701d-48f1-9a80-a613c07cc05c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_5242a57d-5655-49dc-86eb-3a173d5441ff" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7e439c32-701d-48f1-9a80-a613c07cc05c" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_5242a57d-5655-49dc-86eb-3a173d5441ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d44974e2-da89-449a-a141-3d913471e7eb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7e439c32-701d-48f1-9a80-a613c07cc05c" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d44974e2-da89-449a-a141-3d913471e7eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e20a0211-d774-4a5b-90e8-b0a52b8b466b" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d44974e2-da89-449a-a141-3d913471e7eb" xlink:to="loc_srt_ProductOrServiceAxis_e20a0211-d774-4a5b-90e8-b0a52b8b466b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e20a0211-d774-4a5b-90e8-b0a52b8b466b_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_e20a0211-d774-4a5b-90e8-b0a52b8b466b" xlink:to="loc_srt_ProductsAndServicesDomain_e20a0211-d774-4a5b-90e8-b0a52b8b466b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a92fe00b-3641-4a50-89ce-a9d9866ee600" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_e20a0211-d774-4a5b-90e8-b0a52b8b466b" xlink:to="loc_srt_ProductsAndServicesDomain_a92fe00b-3641-4a50-89ce-a9d9866ee600" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubscriptionAndCirculationMember_f4949797-50ac-44b0-8d37-1537366e3e02" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubscriptionAndCirculationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a92fe00b-3641-4a50-89ce-a9d9866ee600" xlink:to="loc_us-gaap_SubscriptionAndCirculationMember_f4949797-50ac-44b0-8d37-1537366e3e02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ProfessionalServicesMember_249c9ba3-40bb-42b4-994a-86bd618cb723" xlink:href="crwd-20200731.xsd#crwd_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a92fe00b-3641-4a50-89ce-a9d9866ee600" xlink:to="loc_crwd_ProfessionalServicesMember_249c9ba3-40bb-42b4-994a-86bd618cb723" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_3e983cac-5813-439e-8498-d43bba341cd4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d44974e2-da89-449a-a141-3d913471e7eb" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_3e983cac-5813-439e-8498-d43bba341cd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3e983cac-5813-439e-8498-d43bba341cd4_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3e983cac-5813-439e-8498-d43bba341cd4" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3e983cac-5813-439e-8498-d43bba341cd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3017dfe5-6cd5-42f7-a73a-448b59a4b81a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3e983cac-5813-439e-8498-d43bba341cd4" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3017dfe5-6cd5-42f7-a73a-448b59a4b81a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_8a08227a-4d74-4b90-9473-673a605414d4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3017dfe5-6cd5-42f7-a73a-448b59a4b81a" xlink:to="loc_us-gaap_CostOfSalesMember_8a08227a-4d74-4b90-9473-673a605414d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_fd6f0967-73a1-4118-9897-4fee79868768" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3017dfe5-6cd5-42f7-a73a-448b59a4b81a" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_fd6f0967-73a1-4118-9897-4fee79868768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_246c3653-f9fa-4956-82b3-c8f15c8a75c6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3017dfe5-6cd5-42f7-a73a-448b59a4b81a" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_246c3653-f9fa-4956-82b3-c8f15c8a75c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_3c054ce7-87f9-4fd6-aa34-98fc9341d849" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3017dfe5-6cd5-42f7-a73a-448b59a4b81a" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_3c054ce7-87f9-4fd6-aa34-98fc9341d849" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligations" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligations"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligations" xlink:type="extended" id="i0813942be8094b678f100fe5bbb1624d_RevenueDeferredRevenueandRemainingPerformanceObligations"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsTables" xlink:type="extended" id="i11a8b054642b42189e0108eab110d53d_RevenueDeferredRevenueandRemainingPerformanceObligationsTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails" xlink:type="extended" id="i94b5ffd2a1a7489aae0e74d884b898a3_RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_07d19d7f-b9d1-4427-9d5a-0beed8c81f3c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_45be6e73-8747-4f41-b569-d765903582d6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_07d19d7f-b9d1-4427-9d5a-0beed8c81f3c" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_45be6e73-8747-4f41-b569-d765903582d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PercentageOfRevenue_85452ecf-7d17-46e8-983a-4e08a4480744" xlink:href="crwd-20200731.xsd#crwd_PercentageOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_07d19d7f-b9d1-4427-9d5a-0beed8c81f3c" xlink:to="loc_crwd_PercentageOfRevenue_85452ecf-7d17-46e8-983a-4e08a4480744" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_387f35b5-e7d3-4f6d-b409-7afb1d7895e3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_07d19d7f-b9d1-4427-9d5a-0beed8c81f3c" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_387f35b5-e7d3-4f6d-b409-7afb1d7895e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_17a7a84e-4469-4683-947c-28d727599303" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_387f35b5-e7d3-4f6d-b409-7afb1d7895e3" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_17a7a84e-4469-4683-947c-28d727599303" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_17a7a84e-4469-4683-947c-28d727599303_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_17a7a84e-4469-4683-947c-28d727599303" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_17a7a84e-4469-4683-947c-28d727599303_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_a40e77a5-2e30-4f3c-8408-84d38c77ebfb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_17a7a84e-4469-4683-947c-28d727599303" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_a40e77a5-2e30-4f3c-8408-84d38c77ebfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesChannelThroughIntermediaryMember_a6e24f5f-ac3b-4ac6-99e8-392d9f8e8a4a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesChannelThroughIntermediaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_a40e77a5-2e30-4f3c-8408-84d38c77ebfb" xlink:to="loc_us-gaap_SalesChannelThroughIntermediaryMember_a6e24f5f-ac3b-4ac6-99e8-392d9f8e8a4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesChannelDirectlyToConsumerMember_b035f30b-c677-4f74-9bc8-5dabd3ee67fb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesChannelDirectlyToConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_a40e77a5-2e30-4f3c-8408-84d38c77ebfb" xlink:to="loc_us-gaap_SalesChannelDirectlyToConsumerMember_b035f30b-c677-4f74-9bc8-5dabd3ee67fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_e53c642f-950c-4507-8a51-8deaabd005dc" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_387f35b5-e7d3-4f6d-b409-7afb1d7895e3" xlink:to="loc_srt_StatementGeographicalAxis_e53c642f-950c-4507-8a51-8deaabd005dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_e53c642f-950c-4507-8a51-8deaabd005dc_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_e53c642f-950c-4507-8a51-8deaabd005dc" xlink:to="loc_srt_SegmentGeographicalDomain_e53c642f-950c-4507-8a51-8deaabd005dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_baeedd83-dfd9-436c-a21e-bfa7b5c895c6" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_e53c642f-950c-4507-8a51-8deaabd005dc" xlink:to="loc_srt_SegmentGeographicalDomain_baeedd83-dfd9-436c-a21e-bfa7b5c895c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_dd4fe2a8-7f64-4360-aaa5-8e6e8875a584" xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_baeedd83-dfd9-436c-a21e-bfa7b5c895c6" xlink:to="loc_country_US_dd4fe2a8-7f64-4360-aaa5-8e6e8875a584" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_0336ca62-eeee-40a0-9e92-fe26f9d87636" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_baeedd83-dfd9-436c-a21e-bfa7b5c895c6" xlink:to="loc_us-gaap_EMEAMember_0336ca62-eeee-40a0-9e92-fe26f9d87636" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_046049e9-d2f7-46a4-9661-4923d7082c77" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_baeedd83-dfd9-436c-a21e-bfa7b5c895c6" xlink:to="loc_srt_AsiaPacificMember_046049e9-d2f7-46a4-9661-4923d7082c77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_OtherCountriesMember_1b035cfa-7ea5-454f-91c5-a49dd3912bdb" xlink:href="crwd-20200731.xsd#crwd_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_baeedd83-dfd9-436c-a21e-bfa7b5c895c6" xlink:to="loc_crwd_OtherCountriesMember_1b035cfa-7ea5-454f-91c5-a49dd3912bdb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails" xlink:type="extended" id="id251cc45906c4de7b5682d0953e1963c_RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:href="crwd-20200731.xsd#crwd_ContractWithCustomerLiabilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_f6845e08-8c6b-4dec-9eae-01061e4f81aa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_f6845e08-8c6b-4dec-9eae-01061e4f81aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RevenueContractLiabilitiesPaymentTerms_6579d8fc-f488-4bf2-a66d-940fa8548c9c" xlink:href="crwd-20200731.xsd#crwd_RevenueContractLiabilitiesPaymentTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:to="loc_crwd_RevenueContractLiabilitiesPaymentTerms_6579d8fc-f488-4bf2-a66d-940fa8548c9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SubscriptionTerm_0a4ae694-645f-49ca-b87c-194b57f709d2" xlink:href="crwd-20200731.xsd#crwd_SubscriptionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:to="loc_crwd_SubscriptionTerm_0a4ae694-645f-49ca-b87c-194b57f709d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RevenueAmortizationOverEstimatedBenefitForCommissionIncludingReferralFeesPaid_61a88c40-ac4a-4b39-a999-f37f5ccd33d6" xlink:href="crwd-20200731.xsd#crwd_RevenueAmortizationOverEstimatedBenefitForCommissionIncludingReferralFeesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:to="loc_crwd_RevenueAmortizationOverEstimatedBenefitForCommissionIncludingReferralFeesPaid_61a88c40-ac4a-4b39-a999-f37f5ccd33d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RevenueAmortizationOverEstimatedBenefitForSalesCommission_db3528ed-e548-45df-bdf7-4deac5f18a7b" xlink:href="crwd-20200731.xsd#crwd_RevenueAmortizationOverEstimatedBenefitForSalesCommission"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:to="loc_crwd_RevenueAmortizationOverEstimatedBenefitForSalesCommission_db3528ed-e548-45df-bdf7-4deac5f18a7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostImpairmentLoss_6389ab59-ed13-480c-b580-0d53366f9d37" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:to="loc_us-gaap_CapitalizedContractCostImpairmentLoss_6389ab59-ed13-480c-b580-0d53366f9d37" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ContractWithCustomerLiabilityTable_330cc305-49eb-46c4-b19d-145f62807f56" xlink:href="crwd-20200731.xsd#crwd_ContractWithCustomerLiabilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_302db173-851b-48d8-8f72-40c8e1b680d4" xlink:to="loc_crwd_ContractWithCustomerLiabilityTable_330cc305-49eb-46c4-b19d-145f62807f56" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9a311815-c5ec-4ca1-b02c-75ebdc245d01" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_crwd_ContractWithCustomerLiabilityTable_330cc305-49eb-46c4-b19d-145f62807f56" xlink:to="loc_srt_RangeAxis_9a311815-c5ec-4ca1-b02c-75ebdc245d01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9a311815-c5ec-4ca1-b02c-75ebdc245d01_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9a311815-c5ec-4ca1-b02c-75ebdc245d01" xlink:to="loc_srt_RangeMember_9a311815-c5ec-4ca1-b02c-75ebdc245d01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_149798ab-30ab-4bd8-9dde-b1d19f5a2ec1" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9a311815-c5ec-4ca1-b02c-75ebdc245d01" xlink:to="loc_srt_RangeMember_149798ab-30ab-4bd8-9dde-b1d19f5a2ec1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_79ecbc25-f44f-46d4-a9a3-ce19bc7a2791" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_149798ab-30ab-4bd8-9dde-b1d19f5a2ec1" xlink:to="loc_srt_MinimumMember_79ecbc25-f44f-46d4-a9a3-ce19bc7a2791" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_50208d93-f8a5-4a6f-9d1a-9b5057fd4611" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_149798ab-30ab-4bd8-9dde-b1d19f5a2ec1" xlink:to="loc_srt_MaximumMember_50208d93-f8a5-4a6f-9d1a-9b5057fd4611" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails" xlink:type="extended" id="iadb93b1d85d0401c82f2d493d7af55e8_RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails" xlink:type="extended" id="i7646c6a090124a899d7bf8d72ccb8045_RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_679c89b0-7ed9-4d2e-8111-3a21deccb530" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_679c89b0-7ed9-4d2e-8111-3a21deccb530" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_eed8f1e7-fd99-46fa-b20e-ca50b1b0817c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_eed8f1e7-fd99-46fa-b20e-ca50b1b0817c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bf53fc54-f7be-4a35-a4c0-67b2b06bb060" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bf53fc54-f7be-4a35-a4c0-67b2b06bb060" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c128cb2b-474b-4d55-b984-7c1df8a0340f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bf53fc54-f7be-4a35-a4c0-67b2b06bb060" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c128cb2b-474b-4d55-b984-7c1df8a0340f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1" xlink:type="extended" id="i2845037619944103b122fe8639f8e89e_RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_679c89b0-7ed9-4d2e-8111-3a21deccb530" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_679c89b0-7ed9-4d2e-8111-3a21deccb530" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_eed8f1e7-fd99-46fa-b20e-ca50b1b0817c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_eed8f1e7-fd99-46fa-b20e-ca50b1b0817c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bf53fc54-f7be-4a35-a4c0-67b2b06bb060" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_d4e518e0-4666-4ba0-b99b-b9b033f27f5f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bf53fc54-f7be-4a35-a4c0-67b2b06bb060" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails" xlink:type="extended" id="i835a1fcdd1284333953da7093f46c915_RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingencies" xlink:type="simple" xlink:href="crwd-20200731.xsd#CommitmentsandContingencies"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingencies" xlink:type="extended" id="i455398cf598c4eeebe77a51cdfb4ed40_CommitmentsandContingencies"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingenciesTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#CommitmentsandContingenciesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingenciesTables" xlink:type="extended" id="i9984e0c467e54e75924b81135db66b70_CommitmentsandContingenciesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingenciesDetails" xlink:type="extended" id="i5e90be47f172452581ed3f5987e32ffb_CommitmentsandContingenciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_78ce1cda-6c93-47f1-a7fd-137ca22bd1bd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligationAmountOfMaturitiesAndSinkingFundRequirements_ad26c9df-e30d-49e2-898d-9f5e8f0eafb9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationAmountOfMaturitiesAndSinkingFundRequirements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78ce1cda-6c93-47f1-a7fd-137ca22bd1bd" xlink:to="loc_us-gaap_RecordedUnconditionalPurchaseObligationAmountOfMaturitiesAndSinkingFundRequirements_ad26c9df-e30d-49e2-898d-9f5e8f0eafb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_a8ff6e7e-f0ef-4db0-8079-e462d61b4238" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78ce1cda-6c93-47f1-a7fd-137ca22bd1bd" xlink:to="loc_us-gaap_LineOfCredit_a8ff6e7e-f0ef-4db0-8079-e462d61b4238" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_0db1bb24-ad0b-4854-8a55-b088649d8718" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78ce1cda-6c93-47f1-a7fd-137ca22bd1bd" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_0db1bb24-ad0b-4854-8a55-b088649d8718" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyAccrual_8c72c8f4-cd07-45d9-a52d-38dc5b3b80b9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProductWarrantyAccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78ce1cda-6c93-47f1-a7fd-137ca22bd1bd" xlink:to="loc_us-gaap_ProductWarrantyAccrual_8c72c8f4-cd07-45d9-a52d-38dc5b3b80b9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_e3e25b0a-aa53-433e-894d-17677a4de51c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_78ce1cda-6c93-47f1-a7fd-137ca22bd1bd" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_e3e25b0a-aa53-433e-894d-17677a4de51c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_4e12824f-242e-42c1-b901-efa7bf6cd33d" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e3e25b0a-aa53-433e-894d-17677a4de51c" xlink:to="loc_srt_StatementGeographicalAxis_4e12824f-242e-42c1-b901-efa7bf6cd33d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_4e12824f-242e-42c1-b901-efa7bf6cd33d_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_4e12824f-242e-42c1-b901-efa7bf6cd33d" xlink:to="loc_srt_SegmentGeographicalDomain_4e12824f-242e-42c1-b901-efa7bf6cd33d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_40787d06-4d71-4a99-a55b-8add180b6231" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_4e12824f-242e-42c1-b901-efa7bf6cd33d" xlink:to="loc_srt_SegmentGeographicalDomain_40787d06-4d71-4a99-a55b-8add180b6231" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_6b9ffe38-261e-4ae1-889b-58fba2f5dbca" xlink:href="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_40787d06-4d71-4a99-a55b-8add180b6231" xlink:to="loc_stpr_CA_6b9ffe38-261e-4ae1-889b-58fba2f5dbca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_TX_392f5c2d-d259-419f-9a25-d0a19997ccfe" xlink:href="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd#stpr_TX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_40787d06-4d71-4a99-a55b-8add180b6231" xlink:to="loc_stpr_TX_392f5c2d-d259-419f-9a25-d0a19997ccfe" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingenciesPurchaseObligationsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#CommitmentsandContingenciesPurchaseObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingenciesPurchaseObligationsDetails" xlink:type="extended" id="i5c048770ced34a729a9919081c85026f_CommitmentsandContingenciesPurchaseObligationsDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/GeographicInformation" xlink:type="simple" xlink:href="crwd-20200731.xsd#GeographicInformation"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/GeographicInformation" xlink:type="extended" id="i84947b9665e0490da84774fcf43a05e9_GeographicInformation"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/GeographicInformationTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#GeographicInformationTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/GeographicInformationTables" xlink:type="extended" id="i56636e1d44b643259feffef457d87b88_GeographicInformationTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/GeographicInformationDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#GeographicInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/GeographicInformationDetails" xlink:type="extended" id="i157c8b0ef2384304b449532fe3afaba9_GeographicInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_20c73267-0be9-4858-b44e-abc719023157" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssets_0117ee7c-1b8d-4ff0-9c27-cb38c6b72761" xlink:href="crwd-20200731.xsd#crwd_PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_20c73267-0be9-4858-b44e-abc719023157" xlink:to="loc_crwd_PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssets_0117ee7c-1b8d-4ff0-9c27-cb38c6b72761" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_f5c63dbc-f504-4a29-b1bd-1ebe6e7773d5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_20c73267-0be9-4858-b44e-abc719023157" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_f5c63dbc-f504-4a29-b1bd-1ebe6e7773d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_d2fe7665-e29d-4dd2-a244-13393513b27e" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_f5c63dbc-f504-4a29-b1bd-1ebe6e7773d5" xlink:to="loc_srt_StatementGeographicalAxis_d2fe7665-e29d-4dd2-a244-13393513b27e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d2fe7665-e29d-4dd2-a244-13393513b27e_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_d2fe7665-e29d-4dd2-a244-13393513b27e" xlink:to="loc_srt_SegmentGeographicalDomain_d2fe7665-e29d-4dd2-a244-13393513b27e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_1e825778-801c-4883-a364-c1892d067bb9" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_d2fe7665-e29d-4dd2-a244-13393513b27e" xlink:to="loc_srt_SegmentGeographicalDomain_1e825778-801c-4883-a364-c1892d067bb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_f2b0a61d-e6b4-4a6d-abcb-773663d29612" xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1e825778-801c-4883-a364-c1892d067bb9" xlink:to="loc_country_US_f2b0a61d-e6b4-4a6d-abcb-773663d29612" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_ccead2c5-8ac1-4c85-866a-26a0dbe73991" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1e825778-801c-4883-a364-c1892d067bb9" xlink:to="loc_us-gaap_NonUsMember_ccead2c5-8ac1-4c85-866a-26a0dbe73991" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RelatedPartyTransactions" xlink:type="simple" xlink:href="crwd-20200731.xsd#RelatedPartyTransactions"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RelatedPartyTransactions" xlink:type="extended" id="ifb4001d6fe484f0982dcf8433e7bd26c_RelatedPartyTransactions"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RelatedPartyTransactionsDetails" xlink:type="extended" id="i29620c3520224bf6a21efed3fe84ea43_RelatedPartyTransactionsDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholders" xlink:type="simple" xlink:href="crwd-20200731.xsd#NetLossPerShareAttributabletoCommonStockholders"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholders" xlink:type="extended" id="ida6ac8800a104a25b2e1cd66a65bbfc1_NetLossPerShareAttributabletoCommonStockholders"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersTables" xlink:type="simple" xlink:href="crwd-20200731.xsd#NetLossPerShareAttributabletoCommonStockholdersTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersTables" xlink:type="extended" id="i81dabea172224523b48a34f44c20d2ac_NetLossPerShareAttributabletoCommonStockholdersTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#NetLossPerShareAttributabletoCommonStockholdersDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersDetails" xlink:type="extended" id="ic42600ad3015458fa0ce8c640279549e_NetLossPerShareAttributabletoCommonStockholdersDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d48df102-466b-4477-9a3b-2682c3516cc3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_5b8c1f26-09bd-4fdb-8818-ae16a70a234a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d48df102-466b-4477-9a3b-2682c3516cc3" xlink:to="loc_us-gaap_NetIncomeLoss_5b8c1f26-09bd-4fdb-8818-ae16a70a234a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_769453d6-f4fb-4a31-905a-87f7a047ba03" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d48df102-466b-4477-9a3b-2682c3516cc3" xlink:to="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_769453d6-f4fb-4a31-905a-87f7a047ba03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_5e241426-4e9f-43f7-a3c6-6bb1f2fe7ffd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d48df102-466b-4477-9a3b-2682c3516cc3" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDiluted_5e241426-4e9f-43f7-a3c6-6bb1f2fe7ffd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9c07d9ee-1b7c-4107-8aca-eed2bf7c3635" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d48df102-466b-4477-9a3b-2682c3516cc3" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9c07d9ee-1b7c-4107-8aca-eed2bf7c3635" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1fb5c4fd-3ab8-4e0f-8dd6-8ec523e47dbc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9c07d9ee-1b7c-4107-8aca-eed2bf7c3635" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1fb5c4fd-3ab8-4e0f-8dd6-8ec523e47dbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1fb5c4fd-3ab8-4e0f-8dd6-8ec523e47dbc_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1fb5c4fd-3ab8-4e0f-8dd6-8ec523e47dbc" xlink:to="loc_us-gaap_ClassOfStockDomain_1fb5c4fd-3ab8-4e0f-8dd6-8ec523e47dbc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_9325bd4d-b8a3-4835-b5d9-207d8ac186bb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1fb5c4fd-3ab8-4e0f-8dd6-8ec523e47dbc" xlink:to="loc_us-gaap_ClassOfStockDomain_9325bd4d-b8a3-4835-b5d9-207d8ac186bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_bb487aab-9b1b-43c4-bb62-e1335b6b1561" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_9325bd4d-b8a3-4835-b5d9-207d8ac186bb" xlink:to="loc_us-gaap_CommonClassAMember_bb487aab-9b1b-43c4-bb62-e1335b6b1561" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_6f94b26f-ef57-4463-af20-b004b6b1c725" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_9325bd4d-b8a3-4835-b5d9-207d8ac186bb" xlink:to="loc_us-gaap_CommonClassBMember_6f94b26f-ef57-4463-af20-b004b6b1c725" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails" xlink:type="simple" xlink:href="crwd-20200731.xsd#NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails" xlink:type="extended" id="i1e57fb64eef446cb90a149691b340bfd_NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_83055b95-25e9-42c4-872b-5b17ad53d84c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_bdcc70b1-19c7-4119-b5e4-13a4e279442c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_83055b95-25e9-42c4-872b-5b17ad53d84c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_bdcc70b1-19c7-4119-b5e4-13a4e279442c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d270fba0-09ee-4eeb-b739-a4c55e9aa4d4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_83055b95-25e9-42c4-872b-5b17ad53d84c" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d270fba0-09ee-4eeb-b739-a4c55e9aa4d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_bbba6849-08d9-422d-b91d-8c678cfb0de5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d270fba0-09ee-4eeb-b739-a4c55e9aa4d4" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_bbba6849-08d9-422d-b91d-8c678cfb0de5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_bbba6849-08d9-422d-b91d-8c678cfb0de5_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_bbba6849-08d9-422d-b91d-8c678cfb0de5" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_bbba6849-08d9-422d-b91d-8c678cfb0de5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1d2bafa4-1b22-41e8-9605-6f598c0377d7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_bbba6849-08d9-422d-b91d-8c678cfb0de5" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1d2bafa4-1b22-41e8-9605-6f598c0377d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockRepurchaseFromOutstandingStockOptionsMember_125cd742-8069-429a-9413-6ec47509743c" xlink:href="crwd-20200731.xsd#crwd_StockRepurchaseFromOutstandingStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1d2bafa4-1b22-41e8-9605-6f598c0377d7" xlink:to="loc_crwd_StockRepurchaseFromOutstandingStockOptionsMember_125cd742-8069-429a-9413-6ec47509743c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_90bbddc1-af1f-4708-ae2a-12e7a2780af4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1d2bafa4-1b22-41e8-9605-6f598c0377d7" xlink:to="loc_us-gaap_RestrictedStockMember_90bbddc1-af1f-4708-ae2a-12e7a2780af4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_3bc5832e-b47b-408c-8682-d29d53fe2480" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1d2bafa4-1b22-41e8-9605-6f598c0377d7" xlink:to="loc_us-gaap_EmployeeStockOptionMember_3bc5832e-b47b-408c-8682-d29d53fe2480" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SharePurchaseRightsUnderEmployeeStockPurchasePlanMember_bbc04d12-6f57-49ee-9e4d-05192980084d" xlink:href="crwd-20200731.xsd#crwd_SharePurchaseRightsUnderEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1d2bafa4-1b22-41e8-9605-6f598c0377d7" xlink:to="loc_crwd_SharePurchaseRightsUnderEmployeeStockPurchasePlanMember_bbc04d12-6f57-49ee-9e4d-05192980084d" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
