<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001585724</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001464521</issuerCik>
      <issuerName>Heartflow, Inc.</issuerName>
      <secFileNumber>001-42790</secFileNumber>
      <issuerAddress>
        <com:street1>135 MAIN STREET, SUITE 1000</com:street1>
        <com:city>SAN FRANCISCO</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>94105</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>650-241-1221</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Rogers Campbell</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Member of immediate family of any of the foregoing</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>5654</noOfUnitsSold>
      <aggregateMarketValue>311026.54</aggregateMarketValue>
      <noOfUnitsOutstanding>86953627</noOfUnitsOutstanding>
      <approxSaleDate>10/22/2026</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/21/2018</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>5654</amountOfSecuritiesAcquired>
      <paymentDate>03/21/2018</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Campbell Rogers</name>
        <address>
          <com:street1>135 Main Street</com:street1>
          <com:street2>Suite 1000</com:street2>
          <com:city>San Francisco</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94105</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/17/2026</saleDate>
      <amountOfSecuritiesSold>9219</amountOfSecuritiesSold>
      <grossProceeds>380099.37</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Campbell Rogers</name>
        <address>
          <com:street1>135 Main Street</com:street1>
          <com:street2>Suite 1000</com:street2>
          <com:city>San Francisco</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94105</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>09/18/2026</saleDate>
      <amountOfSecuritiesSold>13179</amountOfSecuritiesSold>
      <grossProceeds>660926.85</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Sarah Rogers Ttee Campbell Rogers 2019 Irrevocable</name>
        <address>
          <com:street1>135 Main Street</com:street1>
          <com:street2>Suite 1000</com:street2>
          <com:city>San Francisco</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94105</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>09/18/2026</saleDate>
      <amountOfSecuritiesSold>5653</amountOfSecuritiesSold>
      <grossProceeds>283497.95</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Sarah Rogers 2020 Irrevocable Trust</name>
        <address>
          <com:street1>135 Main Street</com:street1>
          <com:street2>Suite 1000</com:street2>
          <com:city>San Francisco</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94105</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>09/18/2026</saleDate>
      <amountOfSecuritiesSold>6503</amountOfSecuritiesSold>
      <grossProceeds>326125.45</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Today's trade and sales in the last 90 days occurred in the Sarah Rogers Ttee Campbell Rogers 2019 Irrevocable Trust, of whom Sarah D. Rogers is a trustee and the spouse of Campbell D. Rogers, an officer in the company. Sales in past 90 days also took place in the Sarah Rogers 2020 Irrevocable Trust of which Campbell D. Rogers is a trustee and account stakeholder.
</remarks>
    <noticeSignature>
      <noticeDate>10/22/2026</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>06/16/2026</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Campbell Rogers</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
