<?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>331 E EVELYN AVENUE</com:street1>
        <com:city>MOUNTAIN VIEW</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>94041</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>650-241-1221</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Rogers Campbell</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</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>64533</noOfUnitsSold>
      <aggregateMarketValue>1589934.72</aggregateMarketValue>
      <noOfUnitsOutstanding>85757754</noOfUnitsOutstanding>
      <approxSaleDate>04/01/2026</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>12/27/2019</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>13047</amountOfSecuritiesAcquired>
      <paymentDate>12/27/2019</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/17/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3867</amountOfSecuritiesAcquired>
      <paymentDate>02/17/2021</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>07/31/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4</amountOfSecuritiesAcquired>
      <paymentDate>07/31/2025</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>04/01/2026</acquiredDate>
      <natureOfAcquisitionTransaction>Options Granted - 07/10/2023</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>47615</amountOfSecuritiesAcquired>
      <paymentDate>04/01/2026</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Campbell &amp; Sarah Rogers Ttees Of The Campbell Roge</name>
        <address>
          <com:street1>331 E. Evelyn Avenue</com:street1>
          <com:city>Mountain View</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94041</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>02/12/2026</saleDate>
      <amountOfSecuritiesSold>16918</amountOfSecuritiesSold>
      <grossProceeds>414287.24</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Campbell &amp; Sarah Rogers Ttees Of The Campbell Roge</name>
        <address>
          <com:street1>331 E. Evelyn Avenue</com:street1>
          <com:city>Mountain View</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94041</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/19/2026</saleDate>
      <amountOfSecuritiesSold>16918</amountOfSecuritiesSold>
      <grossProceeds>422950.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Campbell Rogers</name>
        <address>
          <com:street1>331 E. Evelyn Avenue</com:street1>
          <com:city>Mountain View</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94041</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>02/12/2026</saleDate>
      <amountOfSecuritiesSold>48235</amountOfSecuritiesSold>
      <grossProceeds>1181198.43</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Campbell Rogers</name>
        <address>
          <com:street1>331 E. Evelyn Avenue</com:street1>
          <com:city>Mountain View</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94041</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/19/2026</saleDate>
      <amountOfSecuritiesSold>47615</amountOfSecuritiesSold>
      <grossProceeds>1235080.72</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Of today's sale, 16,918 shares were sold in the Campbell &amp; Sarah Rogers Ttees Of The Campbell Roge trust account in which Campbell D. Rogers is a trustee and account stakeholder.</remarks>
    <noticeSignature>
      <noticeDate>04/01/2026</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>09/12/2025</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Campbell D. Rogers</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
