<SEC-DOCUMENT>0001237685-17-000001.txt : 20170621
<SEC-HEADER>0001237685-17-000001.hdr.sgml : 20170621
<ACCEPTANCE-DATETIME>20170621102330
ACCESSION NUMBER:		0001237685-17-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20170620
FILED AS OF DATE:		20170621
DATE AS OF CHANGE:		20170621

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			II-VI INC
		CENTRAL INDEX KEY:			0000820318
		STANDARD INDUSTRIAL CLASSIFICATION:	OPTICAL INSTRUMENTS & LENSES [3827]
		IRS NUMBER:				251214948
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		375 SAXONBURG BLVD
		CITY:			SAXONBURG
		STATE:			PA
		ZIP:			16056
		BUSINESS PHONE:		724-352-4455

	MAIL ADDRESS:	
		STREET 1:		375 SAXONBURG BLVD
		CITY:			SAXONBURG
		STATE:			PA
		ZIP:			16056

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BARBAROSSA GIOVANNI
		CENTRAL INDEX KEY:			0001237685

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-16195
		FILM NUMBER:		17922253

	MAIL ADDRESS:	
		STREET 1:		C/O II-VI INCORPORATED
		STREET 2:		375 SAXONBURG BLVD
		CITY:			SAXONBURG
		STATE:			PA
		ZIP:			16056
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-06-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000820318</issuerCik>
        <issuerName>II-VI INC</issuerName>
        <issuerTradingSymbol>IIVI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001237685</rptOwnerCik>
            <rptOwnerName>BARBAROSSA GIOVANNI</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O II-VI INCORPORATED</rptOwnerStreet1>
            <rptOwnerStreet2>375 SAXONBURG BLVD</rptOwnerStreet2>
            <rptOwnerCity>SAXONBURG</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>16056</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CTO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-06-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>921</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>34.05</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50011</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These shares were withheld by the Company to discharge withholding tax obligations of the reporting person and do not constitute an actual sale or other open-market transaction.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jeffrey W. Acre, Attorney-in-Fact</signatureName>
        <signatureDate>2017-06-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>barbarossapoa.txt
<DESCRIPTION>POA
<TEXT>
POWER OF ATTORNEY

I, Giovanni Barbarossa, do hereby make, constitute, designate and appoint
Jeffrey W. Acre and D. Mark McMillan, and each of them and their designees
or substitutes, as my true and lawful Attorney-in-Fact, for me and in my
name and on my behalf generally:

1. To execute and file any and all forms required to be filed by me with
the U.S. Securities Exchange Commission ("SEC"), including Form ID, Form
144 and any other filings pursuant to Section 16 of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), including Forms 3, 4, and 5,
and any amendment thereto;

2. To do and perform any and all acts which may be necessary or desirable
to prepare, complete, and execute any and all forms required to be filed by
me with the SEC, including Form ID, Form 144 and any other filings pursuant
to Section 16 of the Exchange Act, including Forms 3, 4, and 5, and any
amendment thereto, and timely deliver and file such forms or amendments with
the SEC and any stock exchange or similar authority; and

3. To take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of either such attorney-in-fact, may be of
benefit to, in the best interest of, or legally required by, me, it being
understood that the documents executed by either such attorney-in-fact on my
behalf pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as either such attorney-in-fact may approve
in either such attorney-in-fact's discretion.

I hereby grant to each such attorney-in-fact full power and authority to do and
perform any and every act and thing whatsoever requisite, necessary, or proper
to be done in the exercise of any of the rights and powers herein granted, as
fully to all intents and purposes as I might or could do if I was personally
present, with full power of substitution or revocation, hereby ratifying and
confirming all that each such attorney-in-fact, or each such attorney-in-fact's
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this Power of Attorney and the rights and powers herein granted.

I acknowledge that each of the foregoing attorneys-in-fact, in serving in such
capacity at my request, is not assuming nor relieving any of my responsibilities
to comply with Section 16 of the Exchange Act.

I also acknowledge that none of the foregoing attorneys-in-fact assume (i) any
liability for my responsibility to comply with the requirements of the
Exchange Act, (ii) any liability for my failure to comply with such
requirements, or (iii) any of my obligations or liabilities for profit
disgorgement under Section 16(b) of the Exchange Act.

This Power of Attorney shall be effective immediately upon execution and shall
be revoked by my giving to any such attorney-in-fact acting hereunder written
notification of the revocation, which notice shall
not be considered binding unless actually received.

I hereby declare that this Power of Attorney shall not be affected by my
disability or incapacity and that as against me and all persons claiming under
me, everything which any such attorney-in-fact shall do
or cause to be done shall be valid and effectual in favor of any person claiming
a benefit thereunder, who, before the doing thereof, shall not have had notice
of revocation of this instrument.

IN WITNESS WHEREOF, I have caused this Power of Attorney to be executed this
9th day of November, 2016.


GRANTOR:


	/s/ Giovanni Barbarossa

Printed Name:  	Giovannia Barbarossa
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
