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>Former 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>40000</noOfUnitsSold>
        <aggregateMarketValue>1882359.72</aggregateMarketValue>
        <noOfUnitsOutstanding>62814333</noOfUnitsOutstanding>
        <approxSaleDate>04/30/2025</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/20/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4366</amountOfSecuritiesAcquired>
        <paymentDate>02/20/2019</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/20/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1114</amountOfSecuritiesAcquired>
        <paymentDate>05/20/2019</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/20/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>859</amountOfSecuritiesAcquired>
        <paymentDate>08/20/2019</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/20/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>859</amountOfSecuritiesAcquired>
        <paymentDate>11/20/2019</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/20/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4754</amountOfSecuritiesAcquired>
        <paymentDate>02/20/2020</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/20/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1832</amountOfSecuritiesAcquired>
        <paymentDate>05/20/2020</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/20/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1833</amountOfSecuritiesAcquired>
        <paymentDate>08/20/2020</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/20/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1833</amountOfSecuritiesAcquired>
        <paymentDate>11/20/2020</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/20/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2336</amountOfSecuritiesAcquired>
        <paymentDate>02/20/2021</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/20/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>8465</amountOfSecuritiesAcquired>
        <paymentDate>05/20/2021</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/20/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3490</amountOfSecuritiesAcquired>
        <paymentDate>08/20/2021</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/20/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3491</amountOfSecuritiesAcquired>
        <paymentDate>11/20/2021</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/20/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4768</amountOfSecuritiesAcquired>
        <paymentDate>02/20/2022</paymentDate>
        <natureOfPayment>Compensation</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>03/26/2025</saleDate>
        <amountOfSecuritiesSold>20000</amountOfSecuritiesSold>
        <grossProceeds>1005044.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <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>03/27/2025</saleDate>
        <amountOfSecuritiesSold>20000</amountOfSecuritiesSold>
        <grossProceeds>1005212.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <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>04/25/2025</saleDate>
        <amountOfSecuritiesSold>56760</amountOfSecuritiesSold>
        <grossProceeds>2665103.36</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>04/30/2025</noticeDate>
        <signature>/s/Wade Moss, 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": 11258}]
text: 144
  0001688366
  XXXXXXXX
  LIVE
  0001666134
  BLACKLINE, INC.
  001-37924
  21300 VICTORY BOULEVARD
  12TH FLOOR
  WOODLAND HILLS
  CA
  91367
  818-223-9008
  Partin Mark
  Former Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  40000
  1882359.72
  62814333
  04/30/2025
  NASDAQ
  Common
  02/20/2019
  Restricted Stock Vesting
  Issuer
  N
  4366
  02/20/2019
  Compensation
  Common
  05/20/2019
  Restricted Stock Vesting
  Issuer
  N
  1114
  05/20/2019
  Compensation
  Common
  08/20/2019
  Restricted Stock Vesting
  Issuer
  N
  859
  08/20/2019
  Compensation
  Common
  11/20/2019
  Restricted Stock Vesting
  Issuer
  N
  859
  11/20/2019
  Compensation
  Common
  02/20/2020
  Restricted Stock Vesting
  Issuer
  N
  4754
  02/20/2020
  Compensation
  Common
  05/20/2020
  Restricted Stock Vesting
  Issuer
  N
  1832
  05/20/2020
  Compensation
  Common
  08/20/2020
  Restricted Stock Vesting
  Issuer
  N
  1833
  08/20/2020
  Compensation
  Common
  11/20/2020
  Restricted Stock Vesting
  Issuer
  N
  1833
  11/20/2020
  Compensation
  Common
  02/20/2021
  Restricted Stock Vesting
  Issuer
  N
  2336
  02/20/2021
  Compensation
  Common
  05/20/2021
  Restricted Stock Vesting
  Issuer
  N
  8465
  05/20/2021
  Compensation
  Common
  08/20/2021
  Restricted Stock Vesting
  Issuer
  N
  3490
  08/20/2021
  Compensation
  Common
  11/20/2021
  Restricted Stock Vesting
  Issuer
  N
  3491
  11/20/2021
  Compensation
  Common
  02/20/2022
  Restricted Stock Vesting
  Issuer
  N
  4768
  02/20/2022
  Compensation
  N
  Mark Partin
  21300 Victory Boulevard
  12th Floor
  Woodland Hills
  CA
  91367
  Common
  03/26/2025
  20000
  1005044.00
  Mark Partin
  21300 Victory Boulevard
  12th Floor
  Woodland Hills
  CA
  91367
  Common
  03/27/2025
  20000
  1005212.00
  Mark Partin
  21300 Victory Boulevard
  12th Floor
  Woodland Hills
  CA
  91367
  Common
  04/25/2025
  56760
  2665103.36
  04/30/2025
  /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Partin