content: <?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>0001688366</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001666134</issuerCik>
        <issuerName>BLACKLINE, INC.</issuerName>
        <secFileNumber>001-37924</secFileNumber>
        <issuerAddress>
          <com:street1>21300 VICTORY BOULEVARD</com:street1>
          <com:street2>12TH FLOOR</com:street2>
          <com:city>WOODLAND HILLS</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>91367</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>818-223-9008</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Partin Mark</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>85308</noOfUnitsSold>
        <aggregateMarketValue>4678018.09</aggregateMarketValue>
        <noOfUnitsOutstanding>62175084</noOfUnitsOutstanding>
        <approxSaleDate>09/30/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted - 03/30/2015</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>39643</amountOfSecuritiesAcquired>
        <paymentDate>09/30/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted - 10/17/2016</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>45665</amountOfSecuritiesAcquired>
        <paymentDate>09/30/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Mark Partin</name>
          <address>
            <com:street1>21300 Victory Boulevard</com:street1>
            <com:street2>12th Floor</com:street2>
            <com:city>Woodland Hills</com:city>
            <com:stateOrCountry>CA</com:stateOrCountry>
            <com:zipCode>91367</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>09/27/2024</saleDate>
        <amountOfSecuritiesSold>5648</amountOfSecuritiesSold>
        <grossProceeds>299344.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>09/30/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>03/06/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Emily Navaro, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  Mark Partin.</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4158}]
text: 144
  0001688366
  XXXXXXXX
  LIVE
  0001666134
  BLACKLINE, INC.
  001-37924
  21300 VICTORY BOULEVARD
  12TH FLOOR
  WOODLAND HILLS
  CA
  91367
  818-223-9008
  Partin Mark
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  85308
  4678018.09
  62175084
  09/30/2024
  NASDAQ
  Common
  09/30/2024
  Option Granted - 03/30/2015
  Issuer
  N
  39643
  09/30/2024
  Cash
  Common
  09/30/2024
  Option Granted - 10/17/2016
  Issuer
  N
  45665
  09/30/2024
  Cash
  N
  Mark Partin
  21300 Victory Boulevard
  12th Floor
  Woodland Hills
  CA
  91367
  Common
  09/27/2024
  5648
  299344.00
  09/30/2024
  03/06/2024
  /s/ Emily Navaro, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  Mark Partin.