<SEC-DOCUMENT>0001752724-19-177745-index.html : 20191125
<SEC-HEADER>0001752724-19-177745.hdr.sgml : 20191125
<ACCEPTANCE-DATETIME>20191125153617
ACCESSION NUMBER:		0001752724-19-177745
CONFORMED SUBMISSION TYPE:	NPORT-P
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20190930
FILED AS OF DATE:		20191125
PERIOD START:           	20191231

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MORGAN STANLEY INSTITUTIONAL FUND INC
		CENTRAL INDEX KEY:			0000836487
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		NPORT-P
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-05624
		FILM NUMBER:		191245971

	BUSINESS ADDRESS:	
		STREET 1:		522 FIFTH AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		800-548-7786

	MAIL ADDRESS:	
		STREET 1:		522 FIFTH AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MORGAN STANLEY DEAN WITTER INSTITUTIONAL FUND INC
		DATE OF NAME CHANGE:	19990329

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MORGAN STANLEY INSTITUTIONAL FUND INC
		DATE OF NAME CHANGE:	19920703
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000836487
<SERIES-ID>S000053789
<SERIES-NAME>US Core Portfolio
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000169220
<CLASS-CONTRACT-NAME>Class I
<CLASS-CONTRACT-TICKER-SYMBOL>MUOIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000169221
<CLASS-CONTRACT-NAME>Class A
<CLASS-CONTRACT-TICKER-SYMBOL>MUOAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000169222
<CLASS-CONTRACT-NAME>Class C
<CLASS-CONTRACT-TICKER-SYMBOL>MUOCX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000169223
<CLASS-CONTRACT-NAME>Class IS
<CLASS-CONTRACT-TICKER-SYMBOL>MUOSX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>NPORT-P
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>NPORT-EX
<SEQUENCE>2
<FILENAME>MSIF_D2.1-8280164_t11uqvm3.htm
<TEXT>
Document 2 - file: MSIF_D2.1-8280164_t11uqvm3.htm

</DOCUMENT>
</SEC-DOCUMENT>