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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2013-08-13</periodOfReport>

    <dateOfOriginalSubmission>2013-08-15</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001034592</issuerCik>
        <issuerName>OMNICOMM SYSTEMS INC</issuerName>
        <issuerTradingSymbol>OMCM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001254385</rptOwnerCik>
            <rptOwnerName>SCHWEITZER ROBERT C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2101 W. COMMERCIAL BLVD.</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 3500</rptOwnerStreet2>
            <rptOwnerCity>FORT LAUDERDALE</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33309</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>110000</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This amendment to the Initial Statement of Beneficial Ownership of Securities on Form 3, filed with the Securities and Exchange Commission on August 15, 2013, is being filed to correct the original Form 3 filing by including shares held by the Reporting Person prior to his appointment to the Board of Directors.</footnote>
        <footnote id="F2">Includes 100,000 restricted shares issued pursuant to the terms and conditions of the OmniComm Systems, Inc. 2009 Equity Incentive Plan, and held in escrow to be released ratable over a three year period conditioned upon continued service. Mr. Schweitzer retains voting rights over all the shares while in escrow and 10,000 shares purchased in the open market on June 26, 2013 at $0.22 per share.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Robert C. Schweitzer</signatureName>
        <signatureDate>2014-04-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
