<?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>0001784383</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000105132</issuerCik>
      <issuerName>WD 40 CO</issuerName>
      <secFileNumber>000-06936</secFileNumber>
      <issuerAddress>
        <com:street1>9715 BUSINESSPARK AVENUE</com:street1>
        <com:city>SAN DIEGO</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>92131</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>6192751400</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Olsem Patricia Q</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>420</noOfUnitsSold>
      <aggregateMarketValue>84000.00</aggregateMarketValue>
      <noOfUnitsOutstanding>13572846</noOfUnitsOutstanding>
      <approxSaleDate>06/14/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>10/21/2015</acquiredDate>
      <natureOfAcquisitionTransaction>Performance Shares</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>82</amountOfSecuritiesAcquired>
      <paymentDate>10/21/2015</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>10/23/2020</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>144</amountOfSecuritiesAcquired>
      <paymentDate>10/23/2020</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>10/22/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>194</amountOfSecuritiesAcquired>
      <paymentDate>10/22/2021</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>This trade occurred in the 2007 Olsem Family Trust account of which Patricia Olsem is a trustee.</remarks>
    <noticeSignature>
      <noticeDate>06/14/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>11/07/2022</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Patricia Q. Olsem</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
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144
0001784383
XXXXXXXX
LIVE
0000105132
WD 40 CO
000-06936
9715 BUSINESSPARK AVENUE
SAN DIEGO
CA
92131
6192751400
Olsem Patricia Q
Officer
Common
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RI
02917
420
84000.00
13572846
06/14/2023
NASDAQ
Common
10/21/2015
Performance Shares
Issuer
N
82
10/21/2015
Compensation
Common
10/23/2020
Restricted Stock Vesting
Issuer
N
144
10/23/2020
Compensation
Common
10/22/2021
Restricted Stock Vesting
Issuer
N
194
10/22/2021
Compensation
Y
This trade occurred in the 2007 Olsem Family Trust account of which Patricia Olsem is a trustee.
06/14/2023
11/07/2022
/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Patricia Q. Olsem