-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 PvaZqMoWcG8SVcln0RKRlK9NgUJ/83WSTyk7POYM54TIcHPgQyowTYXFAvlb6JEk
 Q/yQ9uM5fmww3QTfKOoBJQ==

<SEC-DOCUMENT>0001137687-03-000001.txt : 20031105
<SEC-HEADER>0001137687-03-000001.hdr.sgml : 20031105
<ACCEPTANCE-DATETIME>20031105122343
ACCESSION NUMBER:		0001137687-03-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031104
FILED AS OF DATE:		20031105

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HORIZON BANCORP /IN/
		CENTRAL INDEX KEY:			0000706129
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				351562417
		STATE OF INCORPORATION:			IN
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		515 FRANKLIN SQ
		CITY:			MICHIGAN CITY
		STATE:			IN
		ZIP:			46360
		BUSINESS PHONE:		2198790211

	MAIL ADDRESS:	
		STREET 1:		515 FRANKLIN SQ
		CITY:			MICHIGAN CITY
		STATE:			IN
		ZIP:			46360

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CITIZENS MICHIANA FINANCIAL CORP
		DATE OF NAME CHANGE:	19861021

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MIDDLETON LARRY N
		CENTRAL INDEX KEY:			0001137687

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10792
		FILM NUMBER:		03978424

	BUSINESS ADDRESS:	
		STREET 1:		3557 WEST WAVERLY RD
		CITY:			LAPORTE
		STATE:			IN
		ZIP:			46350
		BUSINESS PHONE:		2198748718

	MAIL ADDRESS:	
		STREET 1:		3557 WEST WAVERLY RD
		CITY:			LAPORTE
		STATE:			IN
		ZIP:			46350
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>

<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-11-04</periodOfReport>


    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000706129</issuerCik>
        <issuerName>HORIZON BANCORP /IN/</issuerName>
        <issuerTradingSymbol>hbnc</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001137687</rptOwnerCik>
            <rptOwnerName>MIDDLETON LARRY N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3557 WEST WAVERLY RD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LAPORTE</rptOwnerCity>
            <rptOwnerState>IN</rptOwnerState>
            <rptOwnerZipCode>46350</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>

        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2003-11-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>92</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>42.85</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2432</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>

    </nonDerivativeTable>



    <ownerSignature>
        <signatureName>/s/ Larry N. Middleton</signatureName>
        <signatureDate>2003-11-05</signatureDate>
    </ownerSignature>
    <ownerSignature>
        <signatureName>James H. Foglesong, Attorney in Fact</signatureName>
        <signatureDate>2003-11-05</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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