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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2013-06-04</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001083220</issuerCik>
        <issuerName>XCel Brands, Inc.</issuerName>
        <issuerTradingSymbol>XELB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001387672</rptOwnerCik>
            <rptOwnerName>TRAFELET CAPITAL MANAGEMENT, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>590 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>26TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001280506</rptOwnerCik>
            <rptOwnerName>TRAFELET &amp; CO ADVISORS LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>590 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>26TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001297619</rptOwnerCik>
            <rptOwnerName>TRAFELET REMY W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TRAFELET CAPITAL MANAGEMENT, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>590 MADISON AVE, 26TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001176974</rptOwnerCik>
            <rptOwnerName>TRAFELET &amp; CO LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>590 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>26TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001130143</rptOwnerCik>
            <rptOwnerName>Delta Institutional, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O TRAFELET &amp; COMPANY ADVISORS LLC</rptOwnerStreet1>
            <rptOwnerStreet2>590 MADISON AVENUE, 26TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock, $0.001 par value</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1809525</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.00</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2013-06-04</value>
            </exerciseDate>
            <expirationDate>
                <value>2018-06-04</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>250000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These securities are held by investment funds (including Delta Institutional, LP), the general partner and/or investment manager of which is directly or indirectly controlled by Remy W. Trafelet (Mr. Trafelet). In such capacity, Mr. Trafelet may be deemed to beneficially own the reported securities.</footnote>
        <footnote id="F2">These securities are held by investment funds (including Delta Institutional, LP) for which Trafelet Capital Management, L.P. (&quot;TCM&quot;) serves as investment manager.   Trafelet &amp; Company, LLC (&quot;TC&quot;) serves as the general partner of TCM. In their respective capacities, each of TCM and TC may be deemed to beneficially own the reported securities.</footnote>
        <footnote id="F3">These securities are held by investment funds (including Delta Institutional, LP) for which Trafelet &amp; Company Advisors, LLC (&quot;TCA&quot;) serves as general partner. In such capacity, TCA may be deemed to beneficially own the reported securities.</footnote>
        <footnote id="F4">Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and the inclusion of such securities in this report shall not be deemed an admission of beneficial ownership for purposes of Section 16 or for any other purpose.</footnote>
        <footnote id="F5">As of June 4, 2013, Delta Institutional, LP directly owns 1,509,296 shares of Common Stock and 227,291 warrants.  TCM, TC, TCA and Mr. Trafelet may be deemed to beneficially own 1,809,525 shares of Common Stock and 250,000 warrants.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ TRAFELET CAPITAL MANAGEMENT, L.P., by Trafelet &amp; Company, LLC, the General Partner, by Remy Trafelet, Managing Member</signatureName>
        <signatureDate>2013-06-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ TRAFELET &amp; COMPANY, LLC, by Remy Trafelet, Managing Member</signatureName>
        <signatureDate>2013-06-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ TRAFELET &amp; COMPANY ADVISORS, LLC, by Remy Trafelet, Managing Member</signatureName>
        <signatureDate>2013-06-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ DELTA INSTITUTIONAL, LP, by Trafelet &amp; Company Advisors, LLC, the General Partner, by Remy Trafelet, Managing Member</signatureName>
        <signatureDate>2013-06-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ REMY TRAFELET</signatureName>
        <signatureDate>2013-06-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
