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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-03-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001030058</issuerCik>
        <issuerName>WORLDGATE COMMUNICATIONS INC</issuerName>
        <issuerTradingSymbol>WGAT.OB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001458595</rptOwnerCik>
            <rptOwnerName>WGI Investor LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>349-L COPPERFIELD BOULEVARD, #392</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CONCORD</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28025</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>0001456822</rptOwnerCik>
            <rptOwnerName>Manna Holdings, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>349-L COPPERFIELD BLVD, #402</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CONCORD</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28025</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>0001456821</rptOwnerCik>
            <rptOwnerName>Praescient, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>PO BOX 1086</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CORNELIUS</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28031</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrant (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.574</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-03-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6000000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2010-03-09</value>
            </exerciseDate>
            <expirationDate>
                <value>2020-03-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $0.01 par value</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6000000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6000000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The reported securities are held directly by WGI Investor LLC (&quot;WGI Investor&quot;).  The securities are held indirectly by Manna Holdings, LLC (&quot;Manna Holdings&quot;), as holder of a substantial majority of the membership interests of WGI Investor, and Praescient, LLC (&quot;Praescient&quot;), as the sole manager of WGI Investor and managing member of Manna Holdings.  Robert Stevanovski is the manager of Praescient and has filed a separate report with respect to the reported securities.</footnote>
        <footnote id="F2">Manna Holdings is the holder of a substantial majority of the membership interests of WGI Investor and Praescient is the manager of WGI Investor and managing member of Manna Holdings.  As such, Praescient and Manna Holdings may be deemed to beneficially own the securities reported herein and owned directly by WGI Investor.  Each of Praescient and Manna Holdings disclaims beneficial ownership of such securities, and this report shall not be deemed an admission that such reporting person is the beneficial owner of the securities for the purpose of Section 16 or for any other purpose, except to the extent of such reporting person's pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>This report is filed jointly by WGI Investor, Manna Holdings and Praescient, all of whom may be deemed to beneficially own more than 10% of a class of the Issuer's securities.  WGI Investor also may be deemed a director by virtue of its right to nominate members of the Issuer's board of directors pursuant to terms of a Securities Purchase Agreement dated as of December 12, 2008 between WGI Investor and the Issuer.</remarks>

    <ownerSignature>
        <signatureName>/s/ WGI Investor LLC, by Praescient, its manager, by Colleen Jones, authorized signatory</signatureName>
        <signatureDate>2010-03-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Manna Holdings, LLC, by Praescient, its managing member, by Colleen Jones, authorized signatory</signatureName>
        <signatureDate>2010-03-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Praescient, LLC, by Colleen Jones, authorized signatory</signatureName>
        <signatureDate>2010-03-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
