<?xml version="1.0" encoding="UTF-8"?><ns2:edgarSubmission xmlns:com="http://www.sec.gov/edgar/common" xmlns:ns2="http://www.sec.gov/edgar/ownership">
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        <ns2:filerInfo>
            <ns2:filer>
                <ns2:filerCredentials>
                    <ns2:cik>0001649552</ns2:cik>
                    <ns2:ccc>XXXXXXXX</ns2:ccc>
                </ns2:filerCredentials>
            </ns2:filer>
            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



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    <ns2:formData>
        <ns2:issuerInfo>
            <ns2:issuerCik>0001637207</ns2:issuerCik>
            <ns2:issuerName>Planet Fitness, Inc.</ns2:issuerName>
            <ns2:secFileNumber>001-37534</ns2:secFileNumber>
            <ns2:issuerAddress>
                <com:street1>4 Liberty Ln W</com:street1>
                <com:city>Hampton</com:city>
                <com:stateOrCountry>NH</com:stateOrCountry>
                <com:zipCode>03842</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-603-750-0001</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Christopher J. Rondeau</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Director</ns2:relationshipToIssuer>
            </ns2:relationshipsToIssuer>
        </ns2:issuerInfo>
        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
                <ns2:name>Goldman Sachs &amp; Co. LLC</ns2:name>
                <ns2:address>
                    <com:street1>200 West Street</com:street1>
                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
                </ns2:address>
            </ns2:brokerOrMarketmakerDetails>
            <ns2:noOfUnitsSold>250000</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>15110000</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>87098326</ns2:noOfUnitsOutstanding>
            <ns2:approxSaleDate>04/25/2024</ns2:approxSaleDate>
            <ns2:securitiesExchangeName>NYSE</ns2:securitiesExchangeName>
        </ns2:securitiesInformation>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Class A</ns2:securitiesClassTitle>
            <ns2:acquiredDate>08/05/2015</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired Class B common shares from Issuer in private transaction; Class B common shares to be converted to Class A common shares in connection with any sales</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>The Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>250000</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>08/05/2015</ns2:paymentDate>
            <ns2:natureOfPayment>None</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>N</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Christopher Rondeau</ns2:name>
                <ns2:address>
                    <com:street1>4 Liberty Ln W</com:street1>
                    <com:city>Hampton</com:city>
                    <com:stateOrCountry>NH</com:stateOrCountry>
                    <com:zipCode>03842</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:saleDate>04/24/2024</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>264007</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>16004419.96</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:noticeSignature>
            <ns2:noticeDate>04/25/2024</ns2:noticeDate>
            <ns2:planAdoptionDates/>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Christopher J. Rondeau</ns2:signature>
        </ns2:noticeSignature>
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144
0001649552
XXXXXXXX
LIVE
0001637207
Planet Fitness, Inc.
001-37534
4 Liberty Ln W
Hampton
NH
03842
1-603-750-0001
Christopher J. Rondeau
Director
Common
Goldman Sachs & Co. LLC
200 West Street
New York
NY
10282
250000
15110000
87098326
04/25/2024
NYSE
Common Class A
08/05/2015
Acquired Class B common shares from Issuer in private transaction; Class B common shares to be converted to Class A common shares in connection with any sales
The Issuer
N
250000
08/05/2015
None
N
Christopher Rondeau
4 Liberty Ln W
Hampton
NH
03842
Common
04/24/2024
264007
16004419.96
04/25/2024
Goldman Sachs & Co. LLC on behalf of Christopher J. Rondeau