<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2021-06-10</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001845257</issuerCik>
        <issuerName>LifeStance Health Group, Inc.</issuerName>
        <issuerTradingSymbol>LFST</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001407544</rptOwnerCik>
            <rptOwnerName>CRISAN JEFFREY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>116 HUNTINGTON AVENUE, 15TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20613453</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Jeffrey Crisan is a Manager of Silversmith Partners I GP, LLC. Silversmith Partners I GP, LLC is the general partner of Silversmith Partners I GP, L.P., which is the general partner of Silversmith Capital Partners I-A, L.P., Silversmith Capital Partners I-B, L.P. and Silversmith Capital Partners I-C, L.P. (collectively, the &quot;Silversmith Entities&quot;). Silversmith Capital Partners I-A, L.P. holds 14,183,201 of the Issuer, Silversmith Capital Partners I-B, L.P. holds 5,130,460 shares of common stock of the Issuer, and Silversmith Capital Partners I-C, L.P. holds 1,299,792 shares of common stock of the Issuer.</footnote>
        <footnote id="F2">As a result of the relationships described above, Mr. Crisan may be deemed to share voting and dispositive power with respect to the shares held by the Silversmith Entities. Mr. Crisan disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein..</footnote>
    </footnotes>

    <remarks>Exhibit List: Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>By: /s/ Ryan Pardo, Attorney-in-Fact</signatureName>
        <signatureDate>2021-06-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
