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>0001165096</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001145255</issuerCik>
        <issuerName>HENNESSY ADVISORS INC</issuerName>
        <secFileNumber>001-36423</secFileNumber>
        <issuerAddress>
          <com:street1>7250 REDWOOD BLVD.</com:street1>
          <com:street2>SUITE 200</com:street2>
          <com:city>NOVATO</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94945</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>415-899-1555</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>STEADMAN DANIEL B</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>FIDELITY BROKERAGE SERVICES LLC </name>
          <address>
            <com:street1>245 SUMMER STREET </com:street1>
            <com:city>BOSTON</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02110</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>24000</noOfUnitsSold>
        <aggregateMarketValue>326400.00</aggregateMarketValue>
        <noOfUnitsOutstanding>7780319</noOfUnitsOutstanding>
        <approxSaleDate>12/16/2024</approxSaleDate>
        <securitiesExchangeName>nasdaq</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/12/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Private place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1654</amountOfSecuritiesAcquired>
        <paymentDate>09/12/2019</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/17/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Private Place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3680</amountOfSecuritiesAcquired>
        <paymentDate>09/17/2019</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/21/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Private place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2576</amountOfSecuritiesAcquired>
        <paymentDate>09/21/2019</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/30/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Private Place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2305</amountOfSecuritiesAcquired>
        <paymentDate>09/30/2019</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/16/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Private Place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1636</amountOfSecuritiesAcquired>
        <paymentDate>09/30/2022</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/21/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Private place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2454</amountOfSecuritiesAcquired>
        <paymentDate>09/21/2022</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/30/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Private place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1244</amountOfSecuritiesAcquired>
        <paymentDate>08/30/2023</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/18/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Private place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3688</amountOfSecuritiesAcquired>
        <paymentDate>09/18/2023</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/18/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Private Place</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4763</amountOfSecuritiesAcquired>
        <paymentDate>09/18/2024</paymentDate>
        <natureOfPayment>n/a</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>12/16/2024</noticeDate>
        <signature>Carmen Zamores as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for STEADMAN DANIEL </signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 6998}]
text: 144
  0001165096
  XXXXXXXX
  LIVE
  0001145255
  HENNESSY ADVISORS INC
  001-36423
  7250 REDWOOD BLVD.
  SUITE 200
  NOVATO
  CA
  94945
  415-899-1555
  STEADMAN DANIEL B
  Officer
  Common
  FIDELITY BROKERAGE SERVICES LLC
  245 SUMMER STREET
  BOSTON
  MA
  02110
  24000
  326400.00
  7780319
  12/16/2024
  nasdaq
  Common
  09/12/2019
  Private place
  Issuer
  N
  1654
  09/12/2019
  n/a
  Common
  09/17/2019
  Private Place
  Issuer
  N
  3680
  09/17/2019
  n/a
  Common
  09/21/2019
  Private place
  Issuer
  N
  2576
  09/21/2019
  n/a
  Common
  09/30/2019
  Private Place
  Issuer
  N
  2305
  09/30/2019
  n/a
  Common
  09/16/2022
  Private Place
  Issuer
  N
  1636
  09/30/2022
  n/a
  Common
  09/21/2022
  Private place
  Issuer
  N
  2454
  09/21/2022
  n/a
  Common
  08/30/2023
  Private place
  Issuer
  N
  1244
  08/30/2023
  n/a
  Common
  09/18/2023
  Private place
  Issuer
  N
  3688
  09/18/2023
  n/a
  Common
  09/18/2024
  Private Place
  Issuer
  N
  4763
  09/18/2024
  n/a
  Y
  12/16/2024
  Carmen Zamores as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for STEADMAN DANIEL