<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001707440</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001759631</issuerCik>
            <issuerName>Hyliion Holdings Corp.</issuerName>
            <secFileNumber>001-38823</secFileNumber>
            <issuerAddress>
                <ns2:street1>1202 BMC DRIVE, SUITE 100</ns2:street1>
                <ns2:city>CEDAR PARK</ns2:city>
                <ns2:stateOrCountry>TX</ns2:stateOrCountry>
                <ns2:zipCode>78613</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(833) 495-4466</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>STEPHEN PANG</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>2584</noOfUnitsSold>
            <aggregateMarketValue>4935.18</aggregateMarketValue>
            <noOfUnitsOutstanding>183208375</noOfUnitsOutstanding>
            <approxSaleDate>03/07/2024</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/26/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2500</amountOfSecuritiesAcquired>
            <paymentDate>03/26/2022</paymentDate>
            <natureOfPayment>Compensation</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/26/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>84</amountOfSecuritiesAcquired>
            <paymentDate>06/26/2022</paymentDate>
            <natureOfPayment>Compensation</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>STEPHEN PANG</name>
                <address>
                    <ns2:street1>1202 BMC DRIVE, SUITE 100</ns2:street1>
                    <ns2:city>CEDAR PARK</ns2:city>
                    <ns2:stateOrCountry>TX</ns2:stateOrCountry>
                    <ns2:zipCode>78613</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/21/2024</saleDate>
            <amountOfSecuritiesSold>63574</amountOfSecuritiesSold>
            <grossProceeds>87954.63</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>03/07/2024</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Stephen Pang</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001707440
XXXXXXXX
LIVE
0001759631
Hyliion Holdings Corp.
001-38823
1202 BMC DRIVE, SUITE 100
CEDAR PARK
TX
78613
(833) 495-4466
STEPHEN PANG
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
2584
4935.18
183208375
03/07/2024
NYSE
Common
03/26/2022
Restricted stock vesting under a registered plan
Issuer
N
2500
03/26/2022
Compensation
Common
06/26/2022
Restricted stock vesting under a registered plan
Issuer
N
84
06/26/2022
Compensation
N
STEPHEN PANG
1202 BMC DRIVE, SUITE 100
CEDAR PARK
TX
78613
Common
02/21/2024
63574
87954.63
03/07/2024
/s/ Stephen Pang