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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a0ed8a-c407-7411-896d-9875e3e6aece,g:ccb53240-f760-4055-b783-776dfe817b81-->
<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.butterflynetwork.com/role/Cover" xlink:type="simple" xlink:href="bfly-20260929.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.butterflynetwork.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_01a0ed8a-c407-7ba1-a756-74e7219f8e35" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_DocumentInformationTable_01a0ed8a-c407-7ba1-a756-74e7219f8e35" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_01a0ed8a-c407-71a6-8e54-d475a4613bfe" 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_dei_DocumentInformationTable_01a0ed8a-c407-7ba1-a756-74e7219f8e35" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_01a0ed8a-c407-71a6-8e54-d475a4613bfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a0ed8a-c407-71a6-8e54-d475a4613bfe_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_01a0ed8a-c407-71a6-8e54-d475a4613bfe" xlink:to="loc_us-gaap_EquityComponentDomain_01a0ed8a-c407-71a6-8e54-d475a4613bfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a0ed8a-c407-740d-ae0f-66a948515c9d" 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_01a0ed8a-c407-71a6-8e54-d475a4613bfe" xlink:to="loc_us-gaap_EquityComponentDomain_01a0ed8a-c407-740d-ae0f-66a948515c9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a0ed8a-c407-720f-a7d1-063869adbd98" 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_01a0ed8a-c407-740d-ae0f-66a948515c9d" xlink:to="loc_us-gaap_CommonStockMember_01a0ed8a-c407-720f-a7d1-063869adbd98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a0ed8a-c407-79c2-98de-a0df0adcf001" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_DocumentType_01a0ed8a-c407-79c2-98de-a0df0adcf001" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a0ed8a-c407-7fe5-b5ce-7722145d10a5" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_DocumentPeriodEndDate_01a0ed8a-c407-7fe5-b5ce-7722145d10a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a0ed8a-c407-76bf-ae7c-9620ba4cad91" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityRegistrantName_01a0ed8a-c407-76bf-ae7c-9620ba4cad91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_01a0ed8a-c407-704a-8294-62b38d3d31f4" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityIncorporationStateCountryCode_01a0ed8a-c407-704a-8294-62b38d3d31f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a0ed8a-c407-75f3-9a9e-1939b02a4ef3" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityFileNumber_01a0ed8a-c407-75f3-9a9e-1939b02a4ef3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01a0ed8a-c407-78f8-a854-6bed08655da4" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityTaxIdentificationNumber_01a0ed8a-c407-78f8-a854-6bed08655da4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a0ed8a-c407-7d1c-914c-442513a92aef" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityAddressAddressLine1_01a0ed8a-c407-7d1c-914c-442513a92aef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a0ed8a-c407-7e30-905b-8038fac03894" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityAddressCityOrTown_01a0ed8a-c407-7e30-905b-8038fac03894" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a0ed8a-c407-7726-9f51-6a2ee89eceea" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityAddressStateOrProvince_01a0ed8a-c407-7726-9f51-6a2ee89eceea" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a0ed8a-c407-7c04-a7b4-b54b1425dac4" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityAddressPostalZipCode_01a0ed8a-c407-7c04-a7b4-b54b1425dac4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a0ed8a-c407-751e-b772-a25996b933b3" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_CityAreaCode_01a0ed8a-c407-751e-b772-a25996b933b3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a0ed8a-c407-7528-aedd-264b380df49e" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_LocalPhoneNumber_01a0ed8a-c407-7528-aedd-264b380df49e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_01a0ed8a-c407-739c-b5d1-afa6eb9c5458" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_WrittenCommunications_01a0ed8a-c407-739c-b5d1-afa6eb9c5458" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_01a0ed8a-c407-79f3-be68-13a9a2543128" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_SolicitingMaterial_01a0ed8a-c407-79f3-be68-13a9a2543128" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_01a0ed8a-c407-7dfe-8b57-72dbe0020587" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_PreCommencementTenderOffer_01a0ed8a-c407-7dfe-8b57-72dbe0020587" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_01a0ed8a-c407-79e9-854f-75ce5d506dad" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_01a0ed8a-c407-79e9-854f-75ce5d506dad" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a0ed8a-c407-789b-902f-5da9d89fd8df" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_Security12bTitle_01a0ed8a-c407-789b-902f-5da9d89fd8df" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a0ed8a-c407-7341-b6e9-da2215dba09d" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_TradingSymbol_01a0ed8a-c407-7341-b6e9-da2215dba09d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a0ed8a-c407-710c-bcaa-4d6ed20d5627" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_SecurityExchangeName_01a0ed8a-c407-710c-bcaa-4d6ed20d5627" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_01a0ed8a-c407-718b-b6a9-725ffcebe29f" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityEmergingGrowthCompany_01a0ed8a-c407-718b-b6a9-725ffcebe29f" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a0ed8a-c407-78cd-b9cf-b0b28aa45eed" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_EntityCentralIndexKey_01a0ed8a-c407-78cd-b9cf-b0b28aa45eed" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a0ed8a-c407-74a3-a8f8-5dfc844ac200" 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_DocumentInformationLineItems_01a0ed8a-c407-772d-b1f3-6796f73ddba1" xlink:to="loc_dei_AmendmentFlag_01a0ed8a-c407-74a3-a8f8-5dfc844ac200" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
