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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019f1901-df55-71c4-b53d-7cab636603a2,g:28d0e399-730d-468f-b91c-412233606865-->
<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.chewy.com/role/CoverPage" xlink:type="simple" xlink:href="chwy-20260802.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019f1901-e01b-7e19-827d-fe9928e161a0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntitiesTable_019f1901-e01b-7e19-827d-fe9928e161a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7bb4-83ab-f262bd984108" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019f1901-e01b-7e19-827d-fe9928e161a0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7bb4-83ab-f262bd984108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7bb4-83ab-f262bd984108_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7bb4-83ab-f262bd984108" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7bb4-83ab-f262bd984108_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7551-8e03-7d1f8201d1d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7bb4-83ab-f262bd984108" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7551-8e03-7d1f8201d1d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019f1901-e01b-7e79-8a6e-a555bfa154c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7551-8e03-7d1f8201d1d1" xlink:to="loc_us-gaap_CommonClassAMember_019f1901-e01b-7e79-8a6e-a555bfa154c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019f1901-e01b-780f-938a-4d9dc185bd16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7551-8e03-7d1f8201d1d1" xlink:to="loc_us-gaap_CommonClassBMember_019f1901-e01b-780f-938a-4d9dc185bd16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019f1901-e01b-7a91-9dbd-1d64bfb04734" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_DocumentType_019f1901-e01b-7a91-9dbd-1d64bfb04734" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019f1901-e01b-76ef-b058-1512c7b7b164" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_DocumentQuarterlyReport_019f1901-e01b-76ef-b058-1512c7b7b164" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019f1901-e01b-72a9-aa0f-98017f511912" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_DocumentPeriodEndDate_019f1901-e01b-72a9-aa0f-98017f511912" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019f1901-e01b-7f43-8b3e-ed9d7e5781cc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_DocumentTransitionReport_019f1901-e01b-7f43-8b3e-ed9d7e5781cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019f1901-e01b-7a72-b07c-d472de4f1afa" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityFileNumber_019f1901-e01b-7a72-b07c-d472de4f1afa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019f1901-e01b-774e-a2c4-a38f88f2a39a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityRegistrantName_019f1901-e01b-774e-a2c4-a38f88f2a39a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019f1901-e01b-77c6-b603-36b52345e9e2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019f1901-e01b-77c6-b603-36b52345e9e2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019f1901-e01b-7300-8dd0-55d0de168bdf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityTaxIdentificationNumber_019f1901-e01b-7300-8dd0-55d0de168bdf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019f1901-e01b-703d-9d26-81b7c26603ea" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityAddressAddressLine1_019f1901-e01b-703d-9d26-81b7c26603ea" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019f1901-e01b-733b-b19b-48664b82889c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityAddressCityOrTown_019f1901-e01b-733b-b19b-48664b82889c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019f1901-e01b-774a-91de-1c0497973c92" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityAddressStateOrProvince_019f1901-e01b-774a-91de-1c0497973c92" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019f1901-e01b-78d1-aa80-aa5d9be53cdf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityAddressPostalZipCode_019f1901-e01b-78d1-aa80-aa5d9be53cdf" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019f1901-e01b-7a7b-b0e5-1ed92ad5e25f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_CityAreaCode_019f1901-e01b-7a7b-b0e5-1ed92ad5e25f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019f1901-e01b-793b-b136-c035095ae99a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_LocalPhoneNumber_019f1901-e01b-793b-b136-c035095ae99a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019f1901-e01b-7245-b502-cf24dad9d955" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_Security12bTitle_019f1901-e01b-7245-b502-cf24dad9d955" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019f1901-e01b-7075-9bfa-81500b2939a1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_TradingSymbol_019f1901-e01b-7075-9bfa-81500b2939a1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019f1901-e01b-7523-8e65-c38fa6bbd1e8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_SecurityExchangeName_019f1901-e01b-7523-8e65-c38fa6bbd1e8" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019f1901-e01b-7c42-bfc1-25c0875ccb71" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityCurrentReportingStatus_019f1901-e01b-7c42-bfc1-25c0875ccb71" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019f1901-e01b-7f87-aff7-8817abfc049e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityInteractiveDataCurrent_019f1901-e01b-7f87-aff7-8817abfc049e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019f1901-e01b-7724-8250-ec0d0cbdf1c5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityFilerCategory_019f1901-e01b-7724-8250-ec0d0cbdf1c5" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019f1901-e01b-7c17-b490-30160cd1aa77" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntitySmallBusiness_019f1901-e01b-7c17-b490-30160cd1aa77" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019f1901-e01b-74da-8a1a-5977252ddfff" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityEmergingGrowthCompany_019f1901-e01b-74da-8a1a-5977252ddfff" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019f1901-e01b-714b-831c-14fea547a8a0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityShellCompany_019f1901-e01b-714b-831c-14fea547a8a0" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019f1901-e01b-7d66-b295-852a048927dc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019f1901-e01b-7d66-b295-852a048927dc" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019f1901-e01b-7755-9168-a03fa2f63f44" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_AmendmentFlag_019f1901-e01b-7755-9168-a03fa2f63f44" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019f1901-e01b-7ed1-b49a-d1427f347110" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019f1901-e01b-7ed1-b49a-d1427f347110" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019f1901-e01b-74e1-b1e6-48d14708eff5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_DocumentFiscalYearFocus_019f1901-e01b-74e1-b1e6-48d14708eff5" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019f1901-e01b-71dc-8450-550ab731f7fb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_EntityCentralIndexKey_019f1901-e01b-71dc-8450-550ab731f7fb" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019f1901-e01b-7f7c-86ed-7320a82758cd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019f1901-e01b-7f36-80d9-90cb346c4736" xlink:to="loc_dei_CurrentFiscalYearEndDate_019f1901-e01b-7f7c-86ed-7320a82758cd" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="chwy-20260802.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019f1901-e01b-7a79-bcca-54113380912e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019f1901-e01b-708b-9499-eb36d77f52de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7a79-bcca-54113380912e" xlink:to="loc_us-gaap_StatementTable_019f1901-e01b-708b-9499-eb36d77f52de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-73c6-bc11-2448aa208a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019f1901-e01b-708b-9499-eb36d77f52de" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-73c6-bc11-2448aa208a7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-73c6-bc11-2448aa208a7b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-73c6-bc11-2448aa208a7b" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-73c6-bc11-2448aa208a7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7f7a-abf4-2f8c5580b557" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-73c6-bc11-2448aa208a7b" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7f7a-abf4-2f8c5580b557" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019f1901-e01b-762b-b8a1-8940f5116f65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7f7a-abf4-2f8c5580b557" xlink:to="loc_us-gaap_CommonClassAMember_019f1901-e01b-762b-b8a1-8940f5116f65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019f1901-e01b-7fd3-b394-514e326bcc75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7f7a-abf4-2f8c5580b557" xlink:to="loc_us-gaap_CommonClassBMember_019f1901-e01b-7fd3-b394-514e326bcc75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7a79-bcca-54113380912e" xlink:to="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019f1901-e01b-7571-add7-915da1b5fc49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019f1901-e01b-7571-add7-915da1b5fc49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesCurrent_019f1901-e01b-79a9-8b06-4e325f5a4f6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:to="loc_us-gaap_MarketableSecuritiesCurrent_019f1901-e01b-79a9-8b06-4e325f5a4f6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019f1901-e01b-7383-aa71-7557ead2e7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019f1901-e01b-7383-aa71-7557ead2e7ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019f1901-e01b-7466-9ac6-96676a028a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:to="loc_us-gaap_InventoryNet_019f1901-e01b-7466-9ac6-96676a028a0b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019f1901-e01b-7c35-9b37-076852c09a43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019f1901-e01b-7c35-9b37-076852c09a43" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019f1901-e01b-712f-9a0e-38addb0055b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019f1901-e01b-7914-88fe-6e0b6f09f2c2" xlink:to="loc_us-gaap_AssetsCurrent_019f1901-e01b-712f-9a0e-38addb0055b4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019f1901-e01b-7b15-896f-002094a832b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019f1901-e01b-7b15-896f-002094a832b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019f1901-e01b-7877-bb36-043e75e7c9ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019f1901-e01b-7877-bb36-043e75e7c9ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019f1901-e01b-7cf9-80e6-1f15dfefcc46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019f1901-e01b-7cf9-80e6-1f15dfefcc46" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019f1901-e01b-73c5-aabd-bfafb8931f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_Goodwill_019f1901-e01b-73c5-aabd-bfafb8931f5c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_019f1901-e01b-74df-af9e-901f5615aa49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_019f1901-e01b-74df-af9e-901f5615aa49" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019f1901-e01b-7b60-a927-42d5a23c654f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019f1901-e01b-7b60-a927-42d5a23c654f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019f1901-e01b-7433-8f24-9c577c4fef15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019f1901-e01b-77af-8c92-829846bca72c" xlink:to="loc_us-gaap_Assets_019f1901-e01b-7433-8f24-9c577c4fef15" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7a79-bcca-54113380912e" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_019f1901-e01b-7433-912a-87efc6917595" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_019f1901-e01b-7433-912a-87efc6917595" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableTradeCurrent_019f1901-e01b-7215-afff-8844666534cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableTradeCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019f1901-e01b-7433-912a-87efc6917595" xlink:to="loc_us-gaap_AccountsPayableTradeCurrent_019f1901-e01b-7215-afff-8844666534cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019f1901-e01b-79c2-9add-8ad94eacda3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019f1901-e01b-7433-912a-87efc6917595" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_019f1901-e01b-79c2-9add-8ad94eacda3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019fd4cb-7142-79a3-9fb2-ae0808ee5eef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019f1901-e01b-7433-912a-87efc6917595" xlink:to="loc_us-gaap_LongTermDebtCurrent_019fd4cb-7142-79a3-9fb2-ae0808ee5eef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019f1901-e01b-74f5-9edd-ef3bb0f7e59b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019f1901-e01b-7433-912a-87efc6917595" xlink:to="loc_us-gaap_LiabilitiesCurrent_019f1901-e01b-74f5-9edd-ef3bb0f7e59b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019f1901-e01b-7175-befc-d3c896439e79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019f1901-e01b-7175-befc-d3c896439e79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019fd4cc-5977-7ef3-8740-0e8d8fde37e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019fd4cc-5977-7ef3-8740-0e8d8fde37e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019f1901-e01b-7bf3-b7f1-8e566f0d7a62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019f1901-e01b-7bf3-b7f1-8e566f0d7a62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019f1901-e01b-75fd-beab-2f4c5ae5c7c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:to="loc_us-gaap_Liabilities_019f1901-e01b-75fd-beab-2f4c5ae5c7c8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:to="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019f1901-e01b-7755-85b7-1f46e0296f23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:to="loc_us-gaap_PreferredStockValue_019f1901-e01b-7755-85b7-1f46e0296f23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019f1901-e01b-7e71-b066-3979005b7d17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:to="loc_us-gaap_CommonStockValue_019f1901-e01b-7e71-b066-3979005b7d17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019f1901-e01b-7e4d-8f4c-0bb81285a7de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019f1901-e01b-7e4d-8f4c-0bb81285a7de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019f1901-e01b-7fb0-9cab-7432f4463f0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019f1901-e01b-7fb0-9cab-7432f4463f0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019f1901-e01b-72a3-a046-fe063a86f8bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019f1901-e01b-72a3-a046-fe063a86f8bf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019f1901-e01b-75be-a361-c2f48cb19493" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019f1901-e01b-7d86-8110-6405244372f6" xlink:to="loc_us-gaap_StockholdersEquity_019f1901-e01b-75be-a361-c2f48cb19493" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019f1901-e01b-7e66-8c44-45f6e492095b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019f1901-e01b-7946-ae2b-1ba8fcb2c551" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019f1901-e01b-7e66-8c44-45f6e492095b" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="chwy-20260802.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019f1901-e01b-7821-8117-e7f4d5cb2da1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_StatementTable_019f1901-e01b-7821-8117-e7f4d5cb2da1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7b39-9317-582de649d0f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019f1901-e01b-7821-8117-e7f4d5cb2da1" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7b39-9317-582de649d0f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7b39-9317-582de649d0f8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7b39-9317-582de649d0f8" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7b39-9317-582de649d0f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7d6a-99dc-618038832cd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7b39-9317-582de649d0f8" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7d6a-99dc-618038832cd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019f1901-e01b-7cc2-ba01-ed3f076806b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7d6a-99dc-618038832cd2" xlink:to="loc_us-gaap_CommonClassAMember_019f1901-e01b-7cc2-ba01-ed3f076806b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019f1901-e01b-7e4b-9e6d-3d598eb832e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7d6a-99dc-618038832cd2" xlink:to="loc_us-gaap_CommonClassBMember_019f1901-e01b-7e4b-9e6d-3d598eb832e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019f1901-e01b-744e-a776-63a5340f3256" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019f1901-e01b-744e-a776-63a5340f3256" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_019f1901-e01b-7f0b-a096-2cc25ca22051" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_019f1901-e01b-7f0b-a096-2cc25ca22051" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_019f1901-e01b-79fa-93c8-4eb2c1d52fd5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_PreferredStockSharesIssued_019f1901-e01b-79fa-93c8-4eb2c1d52fd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_019f1901-e01b-756e-b58c-ae2ebc5c55f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_019f1901-e01b-756e-b58c-ae2ebc5c55f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019f1901-e01b-71c8-ab88-e4d86e47c6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019f1901-e01b-71c8-ab88-e4d86e47c6c7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019f1901-e01b-711a-964c-f9c422f41421" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019f1901-e01b-711a-964c-f9c422f41421" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019f1901-e01b-7d58-9352-54d3b9994c3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_CommonStockSharesIssued_019f1901-e01b-7d58-9352-54d3b9994c3b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019f1901-e01b-7eda-b81d-0d81527772d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-7e5c-85ea-d658076a88b4" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019f1901-e01b-7eda-b81d-0d81527772d6" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="chwy-20260802.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019f1901-e01b-79d6-80be-ed172246f08e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019f1901-e01b-706d-96b6-14be1b1c5101" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-79d6-80be-ed172246f08e" xlink:to="loc_us-gaap_StatementTable_019f1901-e01b-706d-96b6-14be1b1c5101" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019f1901-e01b-7264-9690-1fe625ceb90d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019f1901-e01b-706d-96b6-14be1b1c5101" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019f1901-e01b-7264-9690-1fe625ceb90d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019f1901-e01b-7264-9690-1fe625ceb90d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019f1901-e01b-7264-9690-1fe625ceb90d" xlink:to="loc_us-gaap_EquityComponentDomain_019f1901-e01b-7264-9690-1fe625ceb90d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019f1901-e01b-719a-8d1d-839e299071e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019f1901-e01b-7264-9690-1fe625ceb90d" xlink:to="loc_us-gaap_EquityComponentDomain_019f1901-e01b-719a-8d1d-839e299071e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019f1901-e01b-771c-92e3-0902b5d26683" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019f1901-e01b-719a-8d1d-839e299071e0" xlink:to="loc_us-gaap_CommonStockMember_019f1901-e01b-771c-92e3-0902b5d26683" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019f1901-e01b-7d58-a171-141e93932416" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019f1901-e01b-719a-8d1d-839e299071e0" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019f1901-e01b-7d58-a171-141e93932416" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019f1901-e01b-7397-a9df-a627557372d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019f1901-e01b-719a-8d1d-839e299071e0" xlink:to="loc_us-gaap_RetainedEarningsMember_019f1901-e01b-7397-a9df-a627557372d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019f1901-e01b-730a-82c9-8e69a3c39566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019f1901-e01b-719a-8d1d-839e299071e0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019f1901-e01b-730a-82c9-8e69a3c39566" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019f1901-e01b-79d6-80be-ed172246f08e" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019f1901-e01b-716a-a79a-c35c0e685a4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019f1901-e01b-716a-a79a-c35c0e685a4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019f1901-e01b-7934-a80d-4ff13edd30de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_StockholdersEquity_019f1901-e01b-7934-a80d-4ff13edd30de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019f1901-e01b-7c45-9967-1aff03dd9273" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019f1901-e01b-7c45-9967-1aff03dd9273" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019f1901-e01b-7a69-b4a9-39870d42b660" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019f1901-e01b-7a69-b4a9-39870d42b660" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019f1901-e01b-70bf-9783-b06601d6a84d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019f1901-e01b-70bf-9783-b06601d6a84d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019f1901-e01b-7fd3-96e0-06265f8f7183" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019f1901-e01b-7fd3-96e0-06265f8f7183" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019f1901-e01b-7996-911d-d0e1a23bee56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019f1901-e01b-7996-911d-d0e1a23bee56" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_StockRepurchasedAndRetiredDuringPeriodSharesIncludingCommissionsAndExciseTax_019f1901-e01b-7d11-aca3-170fbc113875" xlink:href="chwy-20260802.xsd#chwy_StockRepurchasedAndRetiredDuringPeriodSharesIncludingCommissionsAndExciseTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_chwy_StockRepurchasedAndRetiredDuringPeriodSharesIncludingCommissionsAndExciseTax_019f1901-e01b-7d11-aca3-170fbc113875" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_StockRepurchasedAndRetiredDuringPeriodValueIncludingCommissionsAndExciseTax_019f1901-e01b-76cb-a2fc-26d537bdd5be" xlink:href="chwy-20260802.xsd#chwy_StockRepurchasedAndRetiredDuringPeriodValueIncludingCommissionsAndExciseTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_chwy_StockRepurchasedAndRetiredDuringPeriodValueIncludingCommissionsAndExciseTax_019f1901-e01b-76cb-a2fc-26d537bdd5be" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019f1901-e01b-7d0b-843c-7b5118024682" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_NetIncomeLoss_019f1901-e01b-7d0b-843c-7b5118024682" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019f1901-e01b-710b-bb36-d4ac6a411e26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019f1901-e01b-72d9-89d0-b480018cb342" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019f1901-e01b-710b-bb36-d4ac6a411e26" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019f1901-e01b-71dc-b199-c76626162cbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019f1901-e01b-78fb-9849-08e6c424ecbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/BasisofPresentationandSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#BasisofPresentationandSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/BasisofPresentationandSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019f1901-e01b-7ac7-86ea-d7987ecb03a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019f1901-e01b-7ac7-86ea-d7987ecb03a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7e6b-9c92-39fe4da4eaf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019f1901-e01b-7ac7-86ea-d7987ecb03a7" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7e6b-9c92-39fe4da4eaf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7e6b-9c92-39fe4da4eaf4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7e6b-9c92-39fe4da4eaf4" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7e6b-9c92-39fe4da4eaf4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7cdd-8aeb-ab7b1ef446fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e01b-7e6b-9c92-39fe4da4eaf4" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7cdd-8aeb-ab7b1ef446fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019f1901-e01b-7ca8-97e3-38c60b98db32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7cdd-8aeb-ab7b1ef446fa" xlink:to="loc_us-gaap_CommonClassAMember_019f1901-e01b-7ca8-97e3-38c60b98db32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019f1901-e01b-7e1c-9d7f-0068aa16d4b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e01b-7cdd-8aeb-ab7b1ef446fa" xlink:to="loc_us-gaap_CommonClassBMember_019f1901-e01b-7e1c-9d7f-0068aa16d4b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019f1901-e01b-7f71-9f2c-89482c548416" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019f1901-e01b-7ac7-86ea-d7987ecb03a7" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019f1901-e01b-7f71-9f2c-89482c548416" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019f1901-e01b-7f71-9f2c-89482c548416_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019f1901-e01b-7f71-9f2c-89482c548416" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019f1901-e01b-7f71-9f2c-89482c548416_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019f1901-e01b-7e41-b2da-2d8e4d3059da" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019f1901-e01b-7f71-9f2c-89482c548416" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019f1901-e01b-7e41-b2da-2d8e4d3059da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_RepurchaseProgramMember_019f1901-e01b-766d-90d0-76a2c9348c64" xlink:href="chwy-20260802.xsd#chwy_RepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019f1901-e01b-7e41-b2da-2d8e4d3059da" xlink:to="loc_chwy_RepurchaseProgramMember_019f1901-e01b-766d-90d0-76a2c9348c64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_June2025ConcurrentStockRepurchaseMember_019fd4f4-71eb-7a5f-bf5c-873b9a47752b" xlink:href="chwy-20260802.xsd#chwy_June2025ConcurrentStockRepurchaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019f1901-e01b-7e41-b2da-2d8e4d3059da" xlink:to="loc_chwy_June2025ConcurrentStockRepurchaseMember_019fd4f4-71eb-7a5f-bf5c-873b9a47752b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_01a0349c-3f24-7d03-b129-e26ae17c9af9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019f1901-e01b-7ac7-86ea-d7987ecb03a7" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_01a0349c-3f24-7d03-b129-e26ae17c9af9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_01a0349c-3f24-7d03-b129-e26ae17c9af9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_01a0349c-3f24-7d03-b129-e26ae17c9af9" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_01a0349c-3f24-7d03-b129-e26ae17c9af9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_01a0349c-3f24-72f2-8950-2a498218ebc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_01a0349c-3f24-7d03-b129-e26ae17c9af9" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_01a0349c-3f24-72f2-8950-2a498218ebc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_SecondaryOfferingMember_01a0349c-3f24-7236-85b7-ee05b0eb6be1" xlink:href="chwy-20260802.xsd#chwy_SecondaryOfferingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_01a0349c-3f24-72f2-8950-2a498218ebc5" xlink:to="loc_chwy_SecondaryOfferingMember_01a0349c-3f24-7236-85b7-ee05b0eb6be1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OverAllotmentOptionMember_01a0349c-3f24-7b4c-a8e5-6d15e71bb2d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OverAllotmentOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_01a0349c-3f24-72f2-8950-2a498218ebc5" xlink:to="loc_us-gaap_OverAllotmentOptionMember_01a0349c-3f24-7b4c-a8e5-6d15e71bb2d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_OptionSharesOfferingMember_01a0349c-3f24-7482-8c60-ddc4f0c36b1f" xlink:href="chwy-20260802.xsd#chwy_OptionSharesOfferingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_01a0349c-3f24-72f2-8950-2a498218ebc5" xlink:to="loc_chwy_OptionSharesOfferingMember_01a0349c-3f24-7482-8c60-ddc4f0c36b1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_01a0349c-3f24-7c3c-a3bc-7cf8c3bcb2d0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019f1901-e01b-7ac7-86ea-d7987ecb03a7" xlink:to="loc_dei_LegalEntityAxis_01a0349c-3f24-7c3c-a3bc-7cf8c3bcb2d0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a0349c-3f24-7c3c-a3bc-7cf8c3bcb2d0_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_01a0349c-3f24-7c3c-a3bc-7cf8c3bcb2d0" xlink:to="loc_dei_EntityDomain_01a0349c-3f24-7c3c-a3bc-7cf8c3bcb2d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a0349c-3f24-723c-8bdf-1b1433d12b7c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_01a0349c-3f24-7c3c-a3bc-7cf8c3bcb2d0" xlink:to="loc_dei_EntityDomain_01a0349c-3f24-723c-8bdf-1b1433d12b7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_BuddyChesterSubLLCMember_01a0349c-3f24-74c5-b96d-9f542824f6c7" xlink:href="chwy-20260802.xsd#chwy_BuddyChesterSubLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_01a0349c-3f24-723c-8bdf-1b1433d12b7c" xlink:to="loc_chwy_BuddyChesterSubLLCMember_01a0349c-3f24-74c5-b96d-9f542824f6c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019f1901-e01b-7d5b-9ba9-877c90ae126b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019f1901-e01b-7d5b-9ba9-877c90ae126b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019f1901-e01b-7120-bdf5-433099301ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019f1901-e01b-7120-bdf5-433099301ad0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019f1901-e01b-7853-a82e-071c686c18ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019f1901-e01b-7853-a82e-071c686c18ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019f1901-e01b-7116-b440-981c7e597cab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019f1901-e01b-7116-b440-981c7e597cab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019f1901-e01b-7c63-ab89-17e1d8f3367c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019f1901-e01b-7c63-ab89-17e1d8f3367c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ShareRepurchaseProgramPayable_019f1901-e01b-75cb-9dbe-1171fecf2df7" xlink:href="chwy-20260802.xsd#chwy_ShareRepurchaseProgramPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_chwy_ShareRepurchaseProgramPayable_019f1901-e01b-75cb-9dbe-1171fecf2df7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_01a0349c-3f24-71d5-ad65-33e19f84ed87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_01a0349c-3f24-71d5-ad65-33e19f84ed87" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_01a0349c-3f24-7ef9-b10c-0356574be161" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_SharePrice_01a0349c-3f24-7ef9-b10c-0356574be161" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_StockIssuedDuringPeriodNumberOfDays_01a0349c-3f24-7e4c-9bdb-9c6eb6c94d53" xlink:href="chwy-20260802.xsd#chwy_StockIssuedDuringPeriodNumberOfDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_chwy_StockIssuedDuringPeriodNumberOfDays_01a0349c-3f24-7e4c-9bdb-9c6eb6c94d53" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_01a0349c-3f24-75c0-a7e3-7cf5fa85eba8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_01a0349c-3f24-75c0-a7e3-7cf5fa85eba8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_01a0349c-3f24-7e72-b660-03d646a529b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConversionOfStockSharesConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_ConversionOfStockSharesConverted1_01a0349c-3f24-7e72-b660-03d646a529b7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019f1901-e01b-7d30-8d2d-96e548ea069c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f1901-e01b-7f6d-bc9b-4c528a2f2777" xlink:to="loc_us-gaap_InterestPaidNet_019f1901-e01b-7d30-8d2d-96e548ea069c" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/AcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-758d-83ae-4d3a0994c991" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7a61-943a-f2cd65cfa776" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-758d-83ae-4d3a0994c991" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7a61-943a-f2cd65cfa776" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7e21-b5dc-520c5a515523" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7a61-943a-f2cd65cfa776" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7e21-b5dc-520c5a515523" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7e21-b5dc-520c5a515523_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7e21-b5dc-520c5a515523" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7e21-b5dc-520c5a515523_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-721c-ab86-a22f1b50bac2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7e21-b5dc-520c5a515523" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-721c-ab86-a22f1b50bac2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_SmartPakEquineLLCMember_019fd680-8cbf-7123-bd79-06598a547653" xlink:href="chwy-20260802.xsd#chwy_SmartPakEquineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-721c-ab86-a22f1b50bac2" xlink:to="loc_chwy_SmartPakEquineLLCMember_019fd680-8cbf-7123-bd79-06598a547653" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ModernAnimalInc.Member_019f1901-e01b-7407-9cc7-4c03eb5234af" xlink:href="chwy-20260802.xsd#chwy_ModernAnimalInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-721c-ab86-a22f1b50bac2" xlink:to="loc_chwy_ModernAnimalInc.Member_019f1901-e01b-7407-9cc7-4c03eb5234af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-721c-b9ff-598f65b04ae2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7a61-943a-f2cd65cfa776" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-721c-b9ff-598f65b04ae2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-721c-b9ff-598f65b04ae2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-721c-b9ff-598f65b04ae2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-721c-b9ff-598f65b04ae2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7077-842f-edaacd587e2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-721c-b9ff-598f65b04ae2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7077-842f-edaacd587e2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019f1901-e01b-7e9a-bc52-c8cafeae8af7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7077-842f-edaacd587e2e" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019f1901-e01b-7e9a-bc52-c8cafeae8af7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_019f1901-e01b-760b-8320-c942adcbc2f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7077-842f-edaacd587e2e" xlink:to="loc_us-gaap_TrademarksMember_019f1901-e01b-760b-8320-c942adcbc2f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ProductPortfolioMember_019f1901-e01b-7dca-894a-9ae6ddc3f8e3" xlink:href="chwy-20260802.xsd#chwy_ProductPortfolioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7077-842f-edaacd587e2e" xlink:to="loc_chwy_ProductPortfolioMember_019f1901-e01b-7dca-894a-9ae6ddc3f8e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_01a034af-4bef-7c67-a42f-c1020d305bf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7077-842f-edaacd587e2e" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_01a034af-4bef-7c67-a42f-c1020d305bf8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019f1901-e01b-7999-bdbe-4d9dc63106d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-758d-83ae-4d3a0994c991" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019f1901-e01b-7999-bdbe-4d9dc63106d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019f1901-e01b-7fec-9044-1449c5e9b00b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-758d-83ae-4d3a0994c991" xlink:to="loc_us-gaap_Goodwill_019f1901-e01b-7fec-9044-1449c5e9b00b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019f1901-e01b-7262-8450-b7336447414d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-758d-83ae-4d3a0994c991" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019f1901-e01b-7262-8450-b7336447414d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019f1901-e01b-76e1-91f3-e461b6e28f6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-758d-83ae-4d3a0994c991" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019f1901-e01b-76e1-91f3-e461b6e28f6f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a034ac-b4f2-7bc6-9986-bc259ecc8b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-758d-83ae-4d3a0994c991" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a034ac-b4f2-7bc6-9986-bc259ecc8b1b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/AcquisitionsScheduleofEstimatedPurchasePriceNetofCashAcquiredDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#AcquisitionsScheduleofEstimatedPurchasePriceNetofCashAcquiredDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/AcquisitionsScheduleofEstimatedPurchasePriceNetofCashAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7f75-9449-71c7e4c794aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7546-a758-cb27e1d9e03b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7f75-9449-71c7e4c794aa" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7546-a758-cb27e1d9e03b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-78bd-82df-70bf75cc180d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7546-a758-cb27e1d9e03b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-78bd-82df-70bf75cc180d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-78bd-82df-70bf75cc180d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-78bd-82df-70bf75cc180d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-78bd-82df-70bf75cc180d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7d62-89d7-d18587523dcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-78bd-82df-70bf75cc180d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7d62-89d7-d18587523dcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_SmartPakEquineLLCMember_019fd681-7381-7639-916d-417a7b4ff069" xlink:href="chwy-20260802.xsd#chwy_SmartPakEquineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7d62-89d7-d18587523dcd" xlink:to="loc_chwy_SmartPakEquineLLCMember_019fd681-7381-7639-916d-417a7b4ff069" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ModernAnimalInc.Member_019f1901-e01b-7b53-8dc3-a3320faf7179" xlink:href="chwy-20260802.xsd#chwy_ModernAnimalInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7d62-89d7-d18587523dcd" xlink:to="loc_chwy_ModernAnimalInc.Member_019f1901-e01b-7b53-8dc3-a3320faf7179" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019f1901-e01b-75a7-b87d-68f097ddf33b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7f75-9449-71c7e4c794aa" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019f1901-e01b-75a7-b87d-68f097ddf33b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_019f1901-e01b-71b0-8f82-e60f5aa0d5dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7f75-9449-71c7e4c794aa" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_019f1901-e01b-71b0-8f82-e60f5aa0d5dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019f1901-e01b-70e4-be22-fea67e614832" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7f75-9449-71c7e4c794aa" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019f1901-e01b-70e4-be22-fea67e614832" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7087-814b-d5de44181ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7eae-8f3c-71edf50a392d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7087-814b-d5de44181ec3" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7eae-8f3c-71edf50a392d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7d76-a7c2-abc06c6f8f84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f1901-e01b-7eae-8f3c-71edf50a392d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7d76-a7c2-abc06c6f8f84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7d76-a7c2-abc06c6f8f84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7d76-a7c2-abc06c6f8f84" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7d76-a7c2-abc06c6f8f84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7233-959f-e00443386c2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f1901-e01b-7d76-a7c2-abc06c6f8f84" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7233-959f-e00443386c2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_SmartPakEquineLLCMember_019fd682-da4b-7bca-aaef-cce2fa3bb36e" xlink:href="chwy-20260802.xsd#chwy_SmartPakEquineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7233-959f-e00443386c2c" xlink:to="loc_chwy_SmartPakEquineLLCMember_019fd682-da4b-7bca-aaef-cce2fa3bb36e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ModernAnimalInc.Member_019f1901-e01b-707a-97db-c73795b121e7" xlink:href="chwy-20260802.xsd#chwy_ModernAnimalInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f1901-e01b-7233-959f-e00443386c2c" xlink:to="loc_chwy_ModernAnimalInc.Member_019f1901-e01b-707a-97db-c73795b121e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7087-814b-d5de44181ec3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019f1901-e01b-74bf-b763-35d3e29a11fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019f1901-e01b-74bf-b763-35d3e29a11fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019f1901-e01b-759f-b456-2961b6235180" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019f1901-e01b-759f-b456-2961b6235180" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019f1901-e01b-71ba-8a52-30eb660bd222" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019f1901-e01b-71ba-8a52-30eb660bd222" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_019f1901-e01b-7457-93ce-2d483a0f2da2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_019f1901-e01b-7457-93ce-2d483a0f2da2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019f1901-e01b-7b9b-8271-425ac437fa16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019f1901-e01b-7b9b-8271-425ac437fa16" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAssets_019f1901-e01b-7e78-9e9d-4542923c7ff9" xlink:href="chwy-20260802.xsd#chwy_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_chwy_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAssets_019f1901-e01b-7e78-9e9d-4542923c7ff9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019f1901-e01b-7e1b-9329-0034dda7e24a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_Goodwill_019f1901-e01b-7e1b-9329-0034dda7e24a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019f1901-e01b-711a-b0b9-9405e16f0daa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019f1901-e01b-711a-b0b9-9405e16f0daa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_01a0128b-6ed0-7017-b223-a82494eb71c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_01a0128b-6ed0-7017-b223-a82494eb71c6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019f1901-e01b-761d-8a7a-7d1a196d1deb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019f1901-e01b-7a84-a70c-28a7ff9e91f0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019f1901-e01b-761d-8a7a-7d1a196d1deb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019f1901-e01b-7399-88bd-e709714ad68c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7087-814b-d5de44181ec3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019f1901-e01b-7399-88bd-e709714ad68c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019f1901-e01b-7795-8658-e3da5d7eeee6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019f1901-e01b-7399-88bd-e709714ad68c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019f1901-e01b-7795-8658-e3da5d7eeee6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_BusinessCombinationRecognizedLiabilityAssumedAccruedExpensesAndOtherLiabilityCurrent_019f1901-e01b-793c-ae37-ef5b3e213b8b" xlink:href="chwy-20260802.xsd#chwy_BusinessCombinationRecognizedLiabilityAssumedAccruedExpensesAndOtherLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019f1901-e01b-7399-88bd-e709714ad68c" xlink:to="loc_chwy_BusinessCombinationRecognizedLiabilityAssumedAccruedExpensesAndOtherLiabilityCurrent_019f1901-e01b-793c-ae37-ef5b3e213b8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019f1901-e01b-74ef-b04f-8bc93b1200c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019f1901-e01b-7399-88bd-e709714ad68c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019f1901-e01b-74ef-b04f-8bc93b1200c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019f1901-e01b-7853-a743-404129a5a67e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f1901-e01b-7087-814b-d5de44181ec3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019f1901-e01b-7853-a743-404129a5a67e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/FinancialInstrumentsScheduleofCashandCashEquivalentsDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#FinancialInstrumentsScheduleofCashandCashEquivalentsDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/FinancialInstrumentsScheduleofCashandCashEquivalentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019f1901-e01b-73c3-8d59-c1761decff6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019f1901-e01b-7c1c-afa7-264c19f975f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019f1901-e01b-73c3-8d59-c1761decff6a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019f1901-e01b-7c1c-afa7-264c19f975f7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019f1901-e01b-77d6-b7ca-2ff48e55b01c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019f1901-e01b-7c1c-afa7-264c19f975f7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019f1901-e01b-77d6-b7ca-2ff48e55b01c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019f1901-e01b-77d6-b7ca-2ff48e55b01c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019f1901-e01b-77d6-b7ca-2ff48e55b01c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019f1901-e01b-77d6-b7ca-2ff48e55b01c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019f1901-e01b-7e89-a000-19c075dd39f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019f1901-e01b-77d6-b7ca-2ff48e55b01c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019f1901-e01b-7e89-a000-19c075dd39f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashMember_019f1901-e01b-71f0-89db-eeaf50a71e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019f1901-e01b-7e89-a000-19c075dd39f3" xlink:to="loc_us-gaap_CashMember_019f1901-e01b-71f0-89db-eeaf50a71e1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019f1901-e01b-720e-874a-052481584974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019f1901-e01b-7e89-a000-19c075dd39f3" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019f1901-e01b-720e-874a-052481584974" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019f1901-e01b-7e8a-b0c6-461a83fabde5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019f1901-e01b-7c1c-afa7-264c19f975f7" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019f1901-e01b-7e8a-b0c6-461a83fabde5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f1901-e01b-7e8a-b0c6-461a83fabde5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f1901-e01b-7e8a-b0c6-461a83fabde5" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f1901-e01b-7e8a-b0c6-461a83fabde5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f1901-e01b-7963-a88b-22f5cc44e503" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f1901-e01b-7e8a-b0c6-461a83fabde5" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f1901-e01b-7963-a88b-22f5cc44e503" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019f1901-e01b-7553-9435-8dc884510292" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f1901-e01b-7963-a88b-22f5cc44e503" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019f1901-e01b-7553-9435-8dc884510292" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f1901-e01b-7dd5-b1bf-18a422254252" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019f1901-e01b-7c1c-afa7-264c19f975f7" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f1901-e01b-7dd5-b1bf-18a422254252" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f1901-e01b-7dd5-b1bf-18a422254252_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f1901-e01b-7dd5-b1bf-18a422254252" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f1901-e01b-7dd5-b1bf-18a422254252_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f1901-e01b-7958-932c-c3b3fa326347" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f1901-e01b-7dd5-b1bf-18a422254252" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f1901-e01b-7958-932c-c3b3fa326347" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019f1901-e01b-79d6-9abe-dc86c39bb319" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f1901-e01b-7958-932c-c3b3fa326347" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019f1901-e01b-79d6-9abe-dc86c39bb319" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019f1901-e01b-7350-ae1b-01b75bc58e29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f1901-e01b-7958-932c-c3b3fa326347" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019f1901-e01b-7350-ae1b-01b75bc58e29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019f1901-e01b-70b4-8c68-3941a2b6dfcf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f1901-e01b-7958-932c-c3b3fa326347" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019f1901-e01b-70b4-8c68-3941a2b6dfcf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019f1901-e01b-7ee4-8ed5-2d6199b5f941" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019f1901-e01b-73c3-8d59-c1761decff6a" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019f1901-e01b-7ee4-8ed5-2d6199b5f941" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019f1901-e01b-7595-8f56-9d73a1c8a2b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019f1901-e01b-73c3-8d59-c1761decff6a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019f1901-e01b-7595-8f56-9d73a1c8a2b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019f1901-e01b-7796-a4e9-4bb409e06750" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019f1901-e01b-73c3-8d59-c1761decff6a" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019f1901-e01b-7796-a4e9-4bb409e06750" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesCurrent_019f1901-e01b-7f0c-8687-b4e353ad2a45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019f1901-e01b-73c3-8d59-c1761decff6a" xlink:to="loc_us-gaap_MarketableSecuritiesCurrent_019f1901-e01b-7f0c-8687-b4e353ad2a45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019f1901-e01b-79ec-9e43-3e6aefb53472" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019f1901-e01b-73c3-8d59-c1761decff6a" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019f1901-e01b-79ec-9e43-3e6aefb53472" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/PropertyandEquipmentnetScheduleofPropertyandEquipmentNetDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#PropertyandEquipmentnetScheduleofPropertyandEquipmentNetDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/PropertyandEquipmentnetScheduleofPropertyandEquipmentNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-73f5-a6b2-2f1a2d8fd5e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-75c5-b7f9-cc382016e98e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-73f5-a6b2-2f1a2d8fd5e0" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-75c5-b7f9-cc382016e98e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7168-a0f5-9f5fea2e8ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-75c5-b7f9-cc382016e98e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7168-a0f5-9f5fea2e8ee1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7168-a0f5-9f5fea2e8ee1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7168-a0f5-9f5fea2e8ee1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7168-a0f5-9f5fea2e8ee1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-79c8-ad61-1066e5ec70c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7168-a0f5-9f5fea2e8ee1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-79c8-ad61-1066e5ec70c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_FurnitureFixturesAndEquipmentMember_019f1901-e01b-7b54-9ecf-af48307214ea" xlink:href="chwy-20260802.xsd#chwy_FurnitureFixturesAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-79c8-ad61-1066e5ec70c1" xlink:to="loc_chwy_FurnitureFixturesAndEquipmentMember_019f1901-e01b-7b54-9ecf-af48307214ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_019f1901-e01b-7576-8df0-333b4d01e7a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-79c8-ad61-1066e5ec70c1" xlink:to="loc_us-gaap_ComputerEquipmentMember_019f1901-e01b-7576-8df0-333b4d01e7a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019f1901-e01b-7683-8a15-1285f16d3b25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-79c8-ad61-1066e5ec70c1" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019f1901-e01b-7683-8a15-1285f16d3b25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_019f1901-e01b-766a-bc4a-deed0db26ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-79c8-ad61-1066e5ec70c1" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_019f1901-e01b-766a-bc4a-deed0db26ba5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_019f1901-e01b-7080-981c-424b251b2ede" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-79c8-ad61-1066e5ec70c1" xlink:to="loc_us-gaap_ConstructionInProgressMember_019f1901-e01b-7080-981c-424b251b2ede" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019f1901-e01b-7735-802c-74ac3b6cdc42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-73f5-a6b2-2f1a2d8fd5e0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019f1901-e01b-7735-802c-74ac3b6cdc42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019f1901-e01b-73f2-b8b9-7f40238e5334" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-73f5-a6b2-2f1a2d8fd5e0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019f1901-e01b-73f2-b8b9-7f40238e5334" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019f1901-e01b-77b2-bd97-cd4f77e35ad1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-73f5-a6b2-2f1a2d8fd5e0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019f1901-e01b-77b2-bd97-cd4f77e35ad1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/PropertyandEquipmentnetScheduleofInternalUseSoftwarenetDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#PropertyandEquipmentnetScheduleofInternalUseSoftwarenetDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/PropertyandEquipmentnetScheduleofInternalUseSoftwarenetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-7ec7-a53c-edd66a7ab256" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-7a84-b3c5-d7bda386b2ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-7ec7-a53c-edd66a7ab256" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-7a84-b3c5-d7bda386b2ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7dcd-bb4c-414864c4a3b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-7a84-b3c5-d7bda386b2ee" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7dcd-bb4c-414864c4a3b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7dcd-bb4c-414864c4a3b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7dcd-bb4c-414864c4a3b4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7dcd-bb4c-414864c4a3b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7cd9-bd4e-693cc5f8304e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7dcd-bb4c-414864c4a3b4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7cd9-bd4e-693cc5f8304e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019f1901-e01b-70cc-a8df-bb3c83eea2b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7cd9-bd4e-693cc5f8304e" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019f1901-e01b-70cc-a8df-bb3c83eea2b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019f1901-e01b-781d-9a73-a1de2b7f946f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-7ec7-a53c-edd66a7ab256" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019f1901-e01b-781d-9a73-a1de2b7f946f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019f1901-e01b-76f9-a958-a96efff8e8bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-7ec7-a53c-edd66a7ab256" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019f1901-e01b-76f9-a958-a96efff8e8bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019f1901-e01b-7f05-9373-094b2e0a5ede" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-7ec7-a53c-edd66a7ab256" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019f1901-e01b-7f05-9373-094b2e0a5ede" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/PropertyandEquipmentnetNarrativeDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#PropertyandEquipmentnetNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/PropertyandEquipmentnetNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-78c9-85ad-678f6e370a2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-72b3-8967-f66fc6e8abe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-78c9-85ad-678f6e370a2c" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-72b3-8967-f66fc6e8abe1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7022-aec8-21e72417c136" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019f1901-e01b-72b3-8967-f66fc6e8abe1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7022-aec8-21e72417c136" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7022-aec8-21e72417c136_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7022-aec8-21e72417c136" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7022-aec8-21e72417c136_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7a70-81c2-377c270a84ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e01b-7022-aec8-21e72417c136" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7a70-81c2-377c270a84ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019f1901-e01b-7b96-9ef0-d30dd2dd145f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e01b-7a70-81c2-377c270a84ec" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019f1901-e01b-7b96-9ef0-d30dd2dd145f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019f1901-e01b-73e6-a77f-9f8a3063505d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-78c9-85ad-678f6e370a2c" xlink:to="loc_us-gaap_Depreciation_019f1901-e01b-73e6-a77f-9f8a3063505d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_019f1901-e01b-7105-9321-f24df45cd1c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019f1901-e01b-78c9-85ad-678f6e370a2c" xlink:to="loc_us-gaap_AdjustmentForAmortization_019f1901-e01b-7105-9321-f24df45cd1c2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/IntangibleAssetsnetScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#IntangibleAssetsnetScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/IntangibleAssetsnetScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019f1901-e01b-73d0-b95b-fadd25395d7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019f1901-e01b-7ee8-9828-f4b13f8e325f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019f1901-e01b-73d0-b95b-fadd25395d7d" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019f1901-e01b-7ee8-9828-f4b13f8e325f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-766c-a428-1973fe6362bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019f1901-e01b-7ee8-9828-f4b13f8e325f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-766c-a428-1973fe6362bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-766c-a428-1973fe6362bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-766c-a428-1973fe6362bd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-766c-a428-1973fe6362bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7185-bd2a-adda0810eda4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-766c-a428-1973fe6362bd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7185-bd2a-adda0810eda4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_01a01094-e79b-71c4-964a-33d83c8d3d8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7185-bd2a-adda0810eda4" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_01a01094-e79b-71c4-964a-33d83c8d3d8f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019f1901-e01b-761f-8bb2-d96095f73b21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7185-bd2a-adda0810eda4" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019f1901-e01b-761f-8bb2-d96095f73b21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_019f1901-e01b-78ce-a26b-08347b9bafa3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7185-bd2a-adda0810eda4" xlink:to="loc_us-gaap_TrademarksMember_019f1901-e01b-78ce-a26b-08347b9bafa3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ProductPortfolioMember_019f1901-e01b-78ad-8a6b-2a72334db094" xlink:href="chwy-20260802.xsd#chwy_ProductPortfolioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7185-bd2a-adda0810eda4" xlink:to="loc_chwy_ProductPortfolioMember_019f1901-e01b-78ad-8a6b-2a72334db094" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019f1901-e01b-79f1-93c0-002f1501df53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019f1901-e01b-73d0-b95b-fadd25395d7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019f1901-e01b-79f1-93c0-002f1501df53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019f1901-e01b-75cd-8bbe-27247d3c5bd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019f1901-e01b-73d0-b95b-fadd25395d7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019f1901-e01b-75cd-8bbe-27247d3c5bd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019f1901-e01b-7414-ba86-16f85a788ab1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019f1901-e01b-73d0-b95b-fadd25395d7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019f1901-e01b-7414-ba86-16f85a788ab1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019f1901-e01b-7561-ab0e-3a964af87d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019f1901-e01b-73d0-b95b-fadd25395d7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019f1901-e01b-7561-ab0e-3a964af87d1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019f1901-e01b-7f7b-9d83-4e4c59654bc3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019f1901-e01b-7e6c-8e1f-4ebff4ad3106" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019f1901-e01b-7f7b-9d83-4e4c59654bc3" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019f1901-e01b-7e6c-8e1f-4ebff4ad3106" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-7832-ae40-826a2a0263ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019f1901-e01b-7e6c-8e1f-4ebff4ad3106" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-7832-ae40-826a2a0263ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7832-ae40-826a2a0263ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-7832-ae40-826a2a0263ba" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-7832-ae40-826a2a0263ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-77ef-b344-790a203723ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019f1901-e01b-7832-ae40-826a2a0263ba" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-77ef-b344-790a203723ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_019f1901-e01b-7024-a261-94d9b81c5f4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019f1901-e01b-77ef-b344-790a203723ab" xlink:to="loc_us-gaap_LicensingAgreementsMember_019f1901-e01b-7024-a261-94d9b81c5f4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019f1901-e01b-7b6a-b17e-fd9c027cb0b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019f1901-e01b-7f7b-9d83-4e4c59654bc3" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019f1901-e01b-7b6a-b17e-fd9c027cb0b0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_019f1901-e01b-7918-aa14-49c98bba6c32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019f1901-e01b-7918-aa14-49c98bba6c32" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019ffee4-8dad-7947-a65b-d7352754a2ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019f1901-e01b-7918-aa14-49c98bba6c32" xlink:to="loc_us-gaap_CreditFacilityAxis_019ffee4-8dad-7947-a65b-d7352754a2ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ffee4-8dad-7947-a65b-d7352754a2ed_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019ffee4-8dad-7947-a65b-d7352754a2ed" xlink:to="loc_us-gaap_CreditFacilityDomain_019ffee4-8dad-7947-a65b-d7352754a2ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ffee4-8dad-7b70-be61-741d1dca5bea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019ffee4-8dad-7947-a65b-d7352754a2ed" xlink:to="loc_us-gaap_CreditFacilityDomain_019ffee4-8dad-7b70-be61-741d1dca5bea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019ffee4-8dad-7d29-be37-693f55935798" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ffee4-8dad-7b70-be61-741d1dca5bea" xlink:to="loc_us-gaap_SecuredDebtMember_019ffee4-8dad-7d29-be37-693f55935798" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019ffee4-c457-77e4-acc5-38759a7300b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ffee4-8dad-7b70-be61-741d1dca5bea" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019ffee4-c457-77e4-acc5-38759a7300b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019ffee4-8dad-7d0a-889f-6138726de812" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019f1901-e01b-7918-aa14-49c98bba6c32" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019ffee4-8dad-7d0a-889f-6138726de812" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019ffee4-8dad-7d0a-889f-6138726de812_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019ffee4-8dad-7d0a-889f-6138726de812" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019ffee4-8dad-7d0a-889f-6138726de812_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019ffee4-8dad-78ad-964c-54df5f9fd686" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019ffee4-8dad-7d0a-889f-6138726de812" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019ffee4-8dad-78ad-964c-54df5f9fd686" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019ffee4-8dad-7483-9570-70fe8d83bef0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019ffee4-8dad-78ad-964c-54df5f9fd686" xlink:to="loc_us-gaap_LineOfCreditMember_019ffee4-8dad-7483-9570-70fe8d83bef0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019ffee4-8dad-7300-814f-a0505f700f49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019f1901-e01b-7918-aa14-49c98bba6c32" xlink:to="loc_us-gaap_VariableRateAxis_019ffee4-8dad-7300-814f-a0505f700f49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019ffee4-8dad-7300-814f-a0505f700f49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019ffee4-8dad-7300-814f-a0505f700f49" xlink:to="loc_us-gaap_VariableRateDomain_019ffee4-8dad-7300-814f-a0505f700f49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019ffee4-8dad-7b9a-b4b4-2211ba2e85cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019ffee4-8dad-7300-814f-a0505f700f49" xlink:to="loc_us-gaap_VariableRateDomain_019ffee4-8dad-7b9a-b4b4-2211ba2e85cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019ffee4-8dad-7ed6-84ca-89d7b717e88b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019ffee4-8dad-7b9a-b4b4-2211ba2e85cf" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019ffee4-8dad-7ed6-84ca-89d7b717e88b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019ffee4-8dad-7a24-b995-f54af74d8763" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019ffee4-8dad-7b9a-b4b4-2211ba2e85cf" xlink:to="loc_us-gaap_BaseRateMember_019ffee4-8dad-7a24-b995-f54af74d8763" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019ffee4-c457-77a0-83ba-d90d9b19dfba" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019f1901-e01b-7918-aa14-49c98bba6c32" xlink:to="loc_srt_RangeAxis_019ffee4-c457-77a0-83ba-d90d9b19dfba" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ffee4-c457-77a0-83ba-d90d9b19dfba_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019ffee4-c457-77a0-83ba-d90d9b19dfba" xlink:to="loc_srt_RangeMember_019ffee4-c457-77a0-83ba-d90d9b19dfba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ffee4-c457-7be5-a359-c925ad972624" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019ffee4-c457-77a0-83ba-d90d9b19dfba" xlink:to="loc_srt_RangeMember_019ffee4-c457-7be5-a359-c925ad972624" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019ffee4-c457-75eb-ae48-90f3f1eb0180" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ffee4-c457-7be5-a359-c925ad972624" xlink:to="loc_srt_MinimumMember_019ffee4-c457-75eb-ae48-90f3f1eb0180" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MedianMember_019ffee4-c457-762c-a317-e3b78b37d7c6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MedianMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ffee4-c457-7be5-a359-c925ad972624" xlink:to="loc_srt_MedianMember_019ffee4-c457-762c-a317-e3b78b37d7c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019ffee4-c457-7a05-8816-336ac1bb2f63" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ffee4-c457-7be5-a359-c925ad972624" xlink:to="loc_srt_MaximumMember_019ffee4-c457-7a05-8816-336ac1bb2f63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019ffee4-8dad-77be-93e5-2fb702e33643" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_DebtInstrumentTerm_019ffee4-8dad-77be-93e5-2fb702e33643" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ffee4-8dad-7fb5-9f36-2fd2c13ad69d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ffee4-8dad-7fb5-9f36-2fd2c13ad69d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019ffee4-8dad-7cbb-bd78-552c34b8e6b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019ffee4-8dad-7cbb-bd78-552c34b8e6b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_01a034bc-85ab-7e3f-8de7-be309126bbfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_01a034bc-85ab-7e3f-8de7-be309126bbfa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_01a067f9-e3ac-7fcd-96d8-9954f9d8fffd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_01a067f9-e3ac-7fcd-96d8-9954f9d8fffd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_DebtInstrumentQuarterlyPaymentPercentOfPrincipal_019ffee4-8dad-747b-81a2-1b58cc130604" xlink:href="chwy-20260802.xsd#chwy_DebtInstrumentQuarterlyPaymentPercentOfPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_chwy_DebtInstrumentQuarterlyPaymentPercentOfPrincipal_019ffee4-8dad-747b-81a2-1b58cc130604" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019ffee4-c457-7012-962f-c48f31dfde72" xlink:href="chwy-20260802.xsd#chwy_LineOfCreditFacilityAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_chwy_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019ffee4-c457-7012-962f-c48f31dfde72" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019ffee4-c457-7c25-bdd1-fc40e9c21867" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_LineOfCredit_019ffee4-c457-7c25-bdd1-fc40e9c21867" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019ffee4-c457-7ef6-8cfe-bcd479d40135" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019ffee4-c457-7ef6-8cfe-bcd479d40135" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019ffeee-4a41-79bc-8926-53f899706915" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019ffeee-4a41-79bc-8926-53f899706915" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_DebtInstrumentNumberOfDaysWithOutstandingDebt_01a034b9-440a-7586-9ffb-bae4b760dc36" xlink:href="chwy-20260802.xsd#chwy_DebtInstrumentNumberOfDaysWithOutstandingDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_chwy_DebtInstrumentNumberOfDaysWithOutstandingDebt_01a034b9-440a-7586-9ffb-bae4b760dc36" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019ffee4-c457-73c2-af14-488f8e383b57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_InterestPaidNet_019ffee4-c457-73c2-af14-488f8e383b57" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_019ffee4-c457-7bc1-aaf3-4a3310eaf652" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_019ffee4-c457-7bc1-aaf3-4a3310eaf652" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019ffee4-c457-7382-9155-5074fe111855" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fecc9-95ff-79de-b30e-227bda5bf71a" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019ffee4-c457-7382-9155-5074fe111855" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/DebtScheduleofMaturitiesofLongTermDebtDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#DebtScheduleofMaturitiesofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/DebtScheduleofMaturitiesofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_01a01076-487c-74b3-a65d-8e12152ac2c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_DebtInstrumentTable_01a01076-487c-74b3-a65d-8e12152ac2c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_01a01076-487c-7624-aa3e-5ea9f86c8f92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a01076-487c-74b3-a65d-8e12152ac2c2" xlink:to="loc_us-gaap_CreditFacilityAxis_01a01076-487c-7624-aa3e-5ea9f86c8f92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a01076-487c-7624-aa3e-5ea9f86c8f92_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_01a01076-487c-7624-aa3e-5ea9f86c8f92" xlink:to="loc_us-gaap_CreditFacilityDomain_01a01076-487c-7624-aa3e-5ea9f86c8f92_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a01076-487c-73ad-b4af-60d163a61e81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_01a01076-487c-7624-aa3e-5ea9f86c8f92" xlink:to="loc_us-gaap_CreditFacilityDomain_01a01076-487c-73ad-b4af-60d163a61e81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_01a01076-487c-72f2-9295-0f1621a63005" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a01076-487c-73ad-b4af-60d163a61e81" xlink:to="loc_us-gaap_SecuredDebtMember_01a01076-487c-72f2-9295-0f1621a63005" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a01076-487c-7cf2-ba31-5798c2987571" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a01076-487c-74b3-a65d-8e12152ac2c2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a01076-487c-7cf2-ba31-5798c2987571" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a01076-487c-7cf2-ba31-5798c2987571_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a01076-487c-7cf2-ba31-5798c2987571" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a01076-487c-7cf2-ba31-5798c2987571_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a01076-487c-7ba1-b7f6-ce84609aeb2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a01076-487c-7cf2-ba31-5798c2987571" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a01076-487c-7ba1-b7f6-ce84609aeb2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a01076-487c-70bc-b91b-0249ad6fa675" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a01076-487c-7ba1-b7f6-ce84609aeb2a" xlink:to="loc_us-gaap_LineOfCreditMember_01a01076-487c-70bc-b91b-0249ad6fa675" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_019ffee2-db79-774b-a633-ea34b3dc2920" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_019ffee2-db79-774b-a633-ea34b3dc2920" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_019ffee2-db79-7cd9-9b62-c579d7891a90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_019ffee2-db79-7cd9-9b62-c579d7891a90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_019ffee2-db79-7e55-a7ca-cf21dbc91cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_019ffee2-db79-7e55-a7ca-cf21dbc91cd3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_019ffee2-db79-7b5f-8f3b-38becff54884" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_019ffee2-db79-7b5f-8f3b-38becff54884" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_019ffee2-db79-79d3-915b-d50d69c73b05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_019ffee2-db79-79d3-915b-d50d69c73b05" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_019ffee2-db79-717e-ba9c-5e6649fc79cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_019ffee2-db79-717e-ba9c-5e6649fc79cb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_019ffee2-db79-7714-b4d8-c9a73a98ae6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_019ffee2-db79-7714-b4d8-c9a73a98ae6a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019ffee2-db79-75ad-af07-5f94ed77eb43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a01076-487c-7574-9974-6b246dc9d72d" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019ffee2-db79-75ad-af07-5f94ed77eb43" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019f1901-e0cb-71cb-a408-0b07f6f80be0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019f1901-e0cb-71cb-a408-0b07f6f80be0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e0cb-7f4f-afc0-eefabd59c8d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019f1901-e0cb-71cb-a408-0b07f6f80be0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e0cb-7f4f-afc0-eefabd59c8d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e0cb-7f4f-afc0-eefabd59c8d8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e0cb-7f4f-afc0-eefabd59c8d8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e0cb-7f4f-afc0-eefabd59c8d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e0cb-74e7-b849-7ba9cb8819f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019f1901-e0cb-7f4f-afc0-eefabd59c8d8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e0cb-74e7-b849-7ba9cb8819f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndBuildingMember_019f1901-e0cb-70ef-aa8e-b9da123078be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LandAndBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e0cb-74e7-b849-7ba9cb8819f9" xlink:to="loc_us-gaap_LandAndBuildingMember_019f1901-e0cb-70ef-aa8e-b9da123078be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_019f1901-e0cb-7a3f-a355-1c2bed93f865" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019f1901-e0cb-74e7-b849-7ba9cb8819f9" xlink:to="loc_us-gaap_EquipmentMember_019f1901-e0cb-7a3f-a355-1c2bed93f865" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019f1901-e0cb-78da-999b-d055485e0f99" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019f1901-e0cb-71cb-a408-0b07f6f80be0" xlink:to="loc_srt_RangeAxis_019f1901-e0cb-78da-999b-d055485e0f99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f1901-e0cb-78da-999b-d055485e0f99_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019f1901-e0cb-78da-999b-d055485e0f99" xlink:to="loc_srt_RangeMember_019f1901-e0cb-78da-999b-d055485e0f99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f1901-e0cb-76fd-8d70-7d8a6dd38294" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019f1901-e0cb-78da-999b-d055485e0f99" xlink:to="loc_srt_RangeMember_019f1901-e0cb-76fd-8d70-7d8a6dd38294" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019f1901-e0cb-7692-837c-0a4dfc8d53f1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019f1901-e0cb-76fd-8d70-7d8a6dd38294" xlink:to="loc_srt_MinimumMember_019f1901-e0cb-7692-837c-0a4dfc8d53f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019f1901-e0cb-7928-985c-8bcac9baf7b6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019f1901-e0cb-76fd-8d70-7d8a6dd38294" xlink:to="loc_srt_MaximumMember_019f1901-e0cb-7928-985c-8bcac9baf7b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019f1901-e0cb-798a-ad27-55120b7b0d33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019f1901-e0cb-798a-ad27-55120b7b0d33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_LesseeOperatingLeaseNumberOfRenewalOptions_019f1901-e0cb-767e-9d6b-bc9ca7541907" xlink:href="chwy-20260802.xsd#chwy_LesseeOperatingLeaseNumberOfRenewalOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:to="loc_chwy_LesseeOperatingLeaseNumberOfRenewalOptions_019f1901-e0cb-767e-9d6b-bc9ca7541907" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_019f1901-e0cb-7584-9414-0d8ffb6f48c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_019f1901-e0cb-7584-9414-0d8ffb6f48c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019f1901-e0cb-751c-b8d4-9a85ccd8c8f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019f1901-e0cb-751c-b8d4-9a85ccd8c8f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_019f1901-e0cb-7684-8cc5-61018eec954b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:to="loc_us-gaap_LeaseCost_019f1901-e0cb-7684-8cc5-61018eec954b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_019f1901-e0cb-7bcc-9cd0-401dfc9ed727" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019f1901-e0cb-7ee0-a319-cc16bb455cc2" xlink:to="loc_us-gaap_OperatingLeasePayments_019f1901-e0cb-7bcc-9cd0-401dfc9ed727" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/SegmentReportingScheduleofSegmentReportingDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#SegmentReportingScheduleofSegmentReportingDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/SegmentReportingScheduleofSegmentReportingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019f1901-e0cb-74f2-b784-54bad380cef2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019f1901-e0cb-74f2-b784-54bad380cef2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019f1901-e0cb-7c60-9850-b8a065609e89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019f1901-e0cb-74f2-b784-54bad380cef2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019f1901-e0cb-7c60-9850-b8a065609e89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019f1901-e0cb-7c60-9850-b8a065609e89_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019f1901-e0cb-7c60-9850-b8a065609e89" xlink:to="loc_us-gaap_SegmentDomain_019f1901-e0cb-7c60-9850-b8a065609e89_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019f1901-e0cb-79de-b13a-e1b0ac0cf53b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019f1901-e0cb-7c60-9850-b8a065609e89" xlink:to="loc_us-gaap_SegmentDomain_019f1901-e0cb-79de-b13a-e1b0ac0cf53b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ReportableSegmentMember_019f1901-e0cb-7e6e-a483-acaa0b119aa5" xlink:href="chwy-20260802.xsd#chwy_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019f1901-e0cb-79de-b13a-e1b0ac0cf53b" xlink:to="loc_chwy_ReportableSegmentMember_019f1901-e0cb-7e6e-a483-acaa0b119aa5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019f1901-e0cb-73d6-a9d6-e4af212b5dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019f1901-e0cb-73d6-a9d6-e4af212b5dfc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019f1901-e0cb-7649-82f6-7b56d92bd3bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019f1901-e0cb-7649-82f6-7b56d92bd3bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019f1901-e0cb-7b89-a293-778f571e8355" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_GrossProfit_019f1901-e0cb-7b89-a293-778f571e8355" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_FulfillmentExpense_019f1901-e0cb-7ea8-b436-26ad124da641" xlink:href="chwy-20260802.xsd#chwy_FulfillmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_chwy_FulfillmentExpense_019f1901-e0cb-7ea8-b436-26ad124da641" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_ShareBasedPaymentArrangementExpenseAndRelatedTaxes_019f1901-e0cb-7db4-966d-3219b9d93452" xlink:href="chwy-20260802.xsd#chwy_ShareBasedPaymentArrangementExpenseAndRelatedTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_chwy_ShareBasedPaymentArrangementExpenseAndRelatedTaxes_019f1901-e0cb-7db4-966d-3219b9d93452" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019f1901-e0cb-76b5-b9f2-9038f59e0ada" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019f1901-e0cb-76b5-b9f2-9038f59e0ada" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSellingGeneralAndAdministrativeExpense_019f1901-e0cb-720b-a022-e0961f0d7d48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_OtherSellingGeneralAndAdministrativeExpense_019f1901-e0cb-720b-a022-e0961f0d7d48" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingAndAdvertisingExpense_019f1901-e0cb-713c-88c6-6c5335f1f376" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketingAndAdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_MarketingAndAdvertisingExpense_019f1901-e0cb-713c-88c6-6c5335f1f376" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019f1901-e0cb-7997-810c-84f64f011acc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019f1901-e0cb-7997-810c-84f64f011acc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndOtherIncome_019f1901-e0cb-7c12-80ac-6079eb83ba5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndOtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_InterestAndOtherIncome_019f1901-e0cb-7c12-80ac-6079eb83ba5f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019f1901-e0cb-7f87-8867-7bd9de1f80fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019f1901-e0cb-725e-a1b2-39badc4289e8" xlink:to="loc_us-gaap_NetIncomeLoss_019f1901-e0cb-7f87-8867-7bd9de1f80fe" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#ShareBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-748c-a0fa-ee5fae06d5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-76de-8127-df9a4f1e463b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-748c-a0fa-ee5fae06d5a9" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-76de-8127-df9a4f1e463b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019f1901-e0cb-74ea-959c-5a28ee6824ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-76de-8127-df9a4f1e463b" xlink:to="loc_us-gaap_PlanNameAxis_019f1901-e0cb-74ea-959c-5a28ee6824ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019f1901-e0cb-74ea-959c-5a28ee6824ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019f1901-e0cb-74ea-959c-5a28ee6824ba" xlink:to="loc_us-gaap_PlanNameDomain_019f1901-e0cb-74ea-959c-5a28ee6824ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019f1901-e0cb-79cf-9e92-2f4ea9dd37d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019f1901-e0cb-74ea-959c-5a28ee6824ba" xlink:to="loc_us-gaap_PlanNameDomain_019f1901-e0cb-79cf-9e92-2f4ea9dd37d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_A2024OmnibusIncentivePlanMember_019f1901-e0cb-7173-b7f3-7082b98bde74" xlink:href="chwy-20260802.xsd#chwy_A2024OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019f1901-e0cb-79cf-9e92-2f4ea9dd37d9" xlink:to="loc_chwy_A2024OmnibusIncentivePlanMember_019f1901-e0cb-7173-b7f3-7082b98bde74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f1901-e0cb-7500-b540-97de6d772acf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-76de-8127-df9a4f1e463b" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f1901-e0cb-7500-b540-97de6d772acf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e0cb-7500-b540-97de6d772acf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e0cb-7500-b540-97de6d772acf" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e0cb-7500-b540-97de6d772acf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f1901-e0cb-7a8d-9aef-37d12c5618c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f1901-e0cb-7500-b540-97de6d772acf" xlink:to="loc_us-gaap_ClassOfStockDomain_019f1901-e0cb-7a8d-9aef-37d12c5618c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019f1901-e0cb-7ab3-b50e-6684eddd4722" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f1901-e0cb-7a8d-9aef-37d12c5618c3" xlink:to="loc_us-gaap_CommonClassAMember_019f1901-e0cb-7ab3-b50e-6684eddd4722" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-72df-a0fb-6d2f03366ade" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-76de-8127-df9a4f1e463b" xlink:to="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-72df-a0fb-6d2f03366ade" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-72df-a0fb-6d2f03366ade_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-72df-a0fb-6d2f03366ade" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-72df-a0fb-6d2f03366ade_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7434-8016-9be89fbdcb24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-72df-a0fb-6d2f03366ade" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7434-8016-9be89fbdcb24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019f1901-e0cb-7825-98ac-47e9a1f12e5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7434-8016-9be89fbdcb24" xlink:to="loc_us-gaap_CommonStockMember_019f1901-e0cb-7825-98ac-47e9a1f12e5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7d4a-b442-5da4b9cfccfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7434-8016-9be89fbdcb24" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7d4a-b442-5da4b9cfccfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7ae7-8c4f-a291fba4ddad" xlink:href="chwy-20260802.xsd#chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7434-8016-9be89fbdcb24" xlink:to="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7ae7-8c4f-a291fba4ddad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019f1901-e0cb-7782-a86e-60c337c97908" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-748c-a0fa-ee5fae06d5a9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019f1901-e0cb-7782-a86e-60c337c97908" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019f1901-e0cb-7b2f-ab4f-7aa56639d253" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-748c-a0fa-ee5fae06d5a9" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019f1901-e0cb-7b2f-ab4f-7aa56639d253" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019f1901-e0cb-7544-9c7e-d38825bd3c43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-748c-a0fa-ee5fae06d5a9" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019f1901-e0cb-7544-9c7e-d38825bd3c43" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019f1901-e0cb-76b3-8825-348bb7f3610e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-748c-a0fa-ee5fae06d5a9" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019f1901-e0cb-76b3-8825-348bb7f3610e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/ShareBasedCompensationScheduleofServiceandPerformanceBasedAwardsActivityDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#ShareBasedCompensationScheduleofServiceandPerformanceBasedAwardsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/ShareBasedCompensationScheduleofServiceandPerformanceBasedAwardsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4e-9f34-7823944b9fe2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-70eb-97ae-9a9d3dedddbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4e-9f34-7823944b9fe2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-70eb-97ae-9a9d3dedddbf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-735b-88b3-4ce84c779f26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-70eb-97ae-9a9d3dedddbf" xlink:to="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-735b-88b3-4ce84c779f26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-735b-88b3-4ce84c779f26_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-735b-88b3-4ce84c779f26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-735b-88b3-4ce84c779f26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7741-9896-044f1688511d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-735b-88b3-4ce84c779f26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7741-9896-044f1688511d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7e2e-b910-bdd75b4a6675" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7741-9896-044f1688511d" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7e2e-b910-bdd75b4a6675" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7ac3-a338-873570096d92" xlink:href="chwy-20260802.xsd#chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7741-9896-044f1688511d" xlink:to="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7ac3-a338-873570096d92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019f1901-e0cb-7377-99a1-36d264effe4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4e-9f34-7823944b9fe2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019f1901-e0cb-7377-99a1-36d264effe4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019f1901-e0cb-7088-8e0f-50bd1f87ba49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019f1901-e0cb-7377-99a1-36d264effe4a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019f1901-e0cb-7088-8e0f-50bd1f87ba49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019f1901-e0cb-70d5-acca-69c798f0137c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019f1901-e0cb-7377-99a1-36d264effe4a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019f1901-e0cb-70d5-acca-69c798f0137c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019f1901-e0cb-7b01-aa8a-559862629733" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019f1901-e0cb-7377-99a1-36d264effe4a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019f1901-e0cb-7b01-aa8a-559862629733" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019f1901-e0cb-7492-babc-226c7d373cfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019f1901-e0cb-7377-99a1-36d264effe4a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019f1901-e0cb-7492-babc-226c7d373cfc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019f1901-e0cb-78b6-a92f-aa17d2cb0bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019f1901-e0cb-747d-8581-22f43aeef5a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4e-9f34-7823944b9fe2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019f1901-e0cb-747d-8581-22f43aeef5a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019f1901-e0cb-71ed-8917-439195e7cd29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019f1901-e0cb-747d-8581-22f43aeef5a8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019f1901-e0cb-71ed-8917-439195e7cd29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019f1901-e0cb-7e70-af9b-7267de37f819" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019f1901-e0cb-747d-8581-22f43aeef5a8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019f1901-e0cb-7e70-af9b-7267de37f819" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019f1901-e0cb-7aba-aa30-fa40bcf86087" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019f1901-e0cb-747d-8581-22f43aeef5a8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019f1901-e0cb-7aba-aa30-fa40bcf86087" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019f1901-e0cb-7e5b-941d-ee386289eb4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019f1901-e0cb-747d-8581-22f43aeef5a8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019f1901-e0cb-7e5b-941d-ee386289eb4d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019f1901-e0cb-7be0-83d8-313ddd1f3c60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/ShareBasedCompensationScheduleofWeightedAverageGrantDateFairValueandTotalFairValueofServiceandPerformanceBasedAwardsActivityDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#ShareBasedCompensationScheduleofWeightedAverageGrantDateFairValueandTotalFairValueofServiceandPerformanceBasedAwardsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/ShareBasedCompensationScheduleofWeightedAverageGrantDateFairValueandTotalFairValueofServiceandPerformanceBasedAwardsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4b-923c-c60d349f05a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-7da1-bd84-c011fe0b4af5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4b-923c-c60d349f05a7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-7da1-bd84-c011fe0b4af5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7c15-b329-2aaf9c1a44e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-7da1-bd84-c011fe0b4af5" xlink:to="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7c15-b329-2aaf9c1a44e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7c15-b329-2aaf9c1a44e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7c15-b329-2aaf9c1a44e5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7c15-b329-2aaf9c1a44e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7e72-93bc-107e18968ad6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7c15-b329-2aaf9c1a44e5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7e72-93bc-107e18968ad6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7493-a7f6-ac693bd38984" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7e72-93bc-107e18968ad6" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7493-a7f6-ac693bd38984" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7987-9040-fa68e57a9f58" xlink:href="chwy-20260802.xsd#chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7e72-93bc-107e18968ad6" xlink:to="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7987-9040-fa68e57a9f58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019f1901-e0cb-72ba-8859-40256bce1048" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4b-923c-c60d349f05a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019f1901-e0cb-72ba-8859-40256bce1048" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_019f1901-e0cb-7f0c-8f51-3e30e3560c04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7a4b-923c-c60d349f05a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_019f1901-e0cb-7f0c-8f51-3e30e3560c04" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/ShareBasedCompensationScheduleofSharebasedCompensationExpenseDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#ShareBasedCompensationScheduleofSharebasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/ShareBasedCompensationScheduleofSharebasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7f48-9688-d3a502834d41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-791d-9675-f4e58e5a691d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7f48-9688-d3a502834d41" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-791d-9675-f4e58e5a691d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7fd4-bcac-0e32f88cbbda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019f1901-e0cb-791d-9675-f4e58e5a691d" xlink:to="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7fd4-bcac-0e32f88cbbda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7fd4-bcac-0e32f88cbbda_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7fd4-bcac-0e32f88cbbda" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7fd4-bcac-0e32f88cbbda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7a2c-9dee-22b21fa4e4a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019f1901-e0cb-7fd4-bcac-0e32f88cbbda" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7a2c-9dee-22b21fa4e4a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7bd0-a8ad-cc80c8985de3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7a2c-9dee-22b21fa4e4a4" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019f1901-e0cb-7bd0-a8ad-cc80c8985de3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7f57-86e5-83516c0dfad3" xlink:href="chwy-20260802.xsd#chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019f1901-e0cb-7a2c-9dee-22b21fa4e4a4" xlink:to="loc_chwy_PerformanceBasedRestrictedStockUnitsPRSUsMember_019f1901-e0cb-7f57-86e5-83516c0dfad3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019f1901-e0cb-77da-a21e-ecad1718ef62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019f1901-e0cb-7f48-9688-d3a502834d41" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019f1901-e0cb-77da-a21e-ecad1718ef62" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.chewy.com/role/CertainRelationshipsandRelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="chwy-20260802.xsd#CertainRelationshipsandRelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.chewy.com/role/CertainRelationshipsandRelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019f1901-e0cc-7193-bacd-598155b8e24d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019f1901-e0cc-73e7-8674-2a48871f3403" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019f1901-e0cc-7193-bacd-598155b8e24d" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019f1901-e0cc-73e7-8674-2a48871f3403" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019f1901-e0cc-76bd-bf03-f3b286e7ce06" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019f1901-e0cc-73e7-8674-2a48871f3403" xlink:to="loc_srt_CounterpartyNameAxis_019f1901-e0cc-76bd-bf03-f3b286e7ce06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1901-e0cc-76bd-bf03-f3b286e7ce06_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019f1901-e0cc-76bd-bf03-f3b286e7ce06" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1901-e0cc-76bd-bf03-f3b286e7ce06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1901-e0cc-7d5c-8982-249f847c4384" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019f1901-e0cc-76bd-bf03-f3b286e7ce06" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1901-e0cc-7d5c-8982-249f847c4384" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_BCPartnersMember_019f1901-e0cc-7d50-ae0e-bc8dc84997a5" xlink:href="chwy-20260802.xsd#chwy_BCPartnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1901-e0cc-7d5c-8982-249f847c4384" xlink:to="loc_chwy_BCPartnersMember_019f1901-e0cc-7d50-ae0e-bc8dc84997a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019f1901-e0cc-7f14-9b1a-57ffea284f75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019f1901-e0cc-73e7-8674-2a48871f3403" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019f1901-e0cc-7f14-9b1a-57ffea284f75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019f1901-e0cc-7f14-9b1a-57ffea284f75_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019f1901-e0cc-7f14-9b1a-57ffea284f75" xlink:to="loc_us-gaap_RelatedPartyDomain_019f1901-e0cc-7f14-9b1a-57ffea284f75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019f1901-e0cc-7c8e-ba64-a5eab12624a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019f1901-e0cc-7f14-9b1a-57ffea284f75" xlink:to="loc_us-gaap_RelatedPartyDomain_019f1901-e0cc-7c8e-ba64-a5eab12624a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019f1901-e0cc-78f9-833a-86a8b9d5f8dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019f1901-e0cc-7c8e-ba64-a5eab12624a8" xlink:to="loc_us-gaap_RelatedPartyMember_019f1901-e0cc-78f9-833a-86a8b9d5f8dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableOtherCurrent_01a0108e-c157-7fe7-a3ee-9fff8d950aff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableOtherCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019f1901-e0cc-7193-bacd-598155b8e24d" xlink:to="loc_us-gaap_AccountsPayableOtherCurrent_01a0108e-c157-7fe7-a3ee-9fff8d950aff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_019f1901-e0cc-7fa0-88f7-72ec3edf33c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019f1901-e0cc-7193-bacd-598155b8e24d" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_019f1901-e0cc-7fa0-88f7-72ec3edf33c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivableAfterAllowanceForCreditLossNoncurrent_019f1901-e0cc-74ed-9c2e-ec9f897577de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherReceivableAfterAllowanceForCreditLossNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019f1901-e0cc-7193-bacd-598155b8e24d" xlink:to="loc_us-gaap_OtherReceivableAfterAllowanceForCreditLossNoncurrent_019f1901-e0cc-74ed-9c2e-ec9f897577de" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-roles-2026.xsd#eedm1"/>
  <link:definitionLink xlink:role="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="41"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_chwy_WilliamBillingsMember_019f1901-df55-7c4b-9913-122fc5ef05a0" xlink:href="chwy-20260802.xsd#chwy_WilliamBillingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_chwy_WilliamBillingsMember_019f1901-df55-7c4b-9913-122fc5ef05a0" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
