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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001209191-05-005179.txt : 20050127
<SEC-HEADER>0001209191-05-005179.hdr.sgml : 20050127
<ACCEPTANCE-DATETIME>20050127165051
ACCESSION NUMBER:		0001209191-05-005179
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050127
FILED AS OF DATE:		20050127
DATE AS OF CHANGE:		20050127

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			National Interstate CORP
		CENTRAL INDEX KEY:			0001301106
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				341607394
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3250 INTERSTATE DRIVE
		CITY:			RICHFIELD
		STATE:			OH
		ZIP:			44286
		BUSINESS PHONE:		(330) 659-8900

	MAIL ADDRESS:	
		STREET 1:		3250 INTERSTATE DRIVE
		CITY:			RICHFIELD
		STATE:			OH
		ZIP:			44286

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AMERICAN FINANCIAL GROUP INC
		CENTRAL INDEX KEY:			0001042046
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51130
		FILM NUMBER:		05554468

	BUSINESS ADDRESS:	
		STREET 1:		ONE EAST FOURTH STREET
		STREET 2:		SUITE 919
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45202
		BUSINESS PHONE:		5135792121

	MAIL ADDRESS:	
		STREET 1:		ONE EAST FOURTH STREET
		STREET 2:		SUITE 919
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45202

	FORMER NAME:	
		FORMER CONFORMED NAME:	AMERICAN FINANCIAL GROUP HOLDINGS INC
		DATE OF NAME CHANGE:	19970709
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc3.xml
<DESCRIPTION>FORM 3 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-01-27</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001301106</issuerCik>
        <issuerName>National Interstate CORP</issuerName>
        <issuerTradingSymbol>NATL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001042046</rptOwnerCik>
            <rptOwnerName>AMERICAN FINANCIAL GROUP INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE EAST FOURTH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 919</rptOwnerStreet2>
            <rptOwnerCity>CINCINNATI</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>45202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10200000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Great American Insurance Company</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">A 100% owned subsidiary of the reporting person.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>AMERICAN FINANCIAL GROUP, INC.
By: Karl J. Grafe, Vice President</signatureName>
        <signatureDate>2005-01-27</signatureDate>
    </ownerSignature>
</ownershipDocument>

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