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Value

Risk/Return:

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Supplement [Text Block]

ck0000836487_SupplementTextBlock

Prospectus Supplement

July 25, 2014

Morgan Stanley Institutional Fund, Inc.

Supplement dated July 25, 2014 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated April 30, 2014

Multi-Asset Portfolio
(the "Portfolio")

The Board of Directors of Morgan Stanley Institutional Fund, Inc. (the "Fund") has approved (i) the offering of a commission, which will be paid by Morgan Stanley Distribution, Inc., as distributor of the Fund, to certain financial intermediaries as compensation on sales of Class A shares of the Portfolios of $1 million or more; and (ii) the imposition of a contingent deferred sales charge on Class A shares of the Portfolios in relation thereto. As a result, effective August 1, 2014, the following changes to the Prospectus are necessary:

Risk/Return [Heading]

rr_RiskReturnHeading

Multi-Asset Portfolio

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table replaces the "Shareholder Fees" table in the section of the Prospectus entitled "Portfolio Summary—Fees and Expenses:"

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Please retain this supplement for future reference.

Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.25%

^[1]

Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)

rr_MaximumDeferredSalesChargeOverOther

none

^[1],[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Investments that are not subject to any sales charges at the time of purchase are subject to a contingent deferred sales charge ("CDSC") of 1.00% that will be imposed if you sell your shares within 18 months after the last day of the month of purchase, except for certain specific circumstances.

Class L

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)

rr_MaximumDeferredSalesChargeOverOther

none

[1]

Effective September 9, 2013, Class P shares were renamed Class A shares.

[2]

Investments that are not subject to any sales charges at the time of purchase are subject to a contingent deferred sales charge ("CDSC") of 1.00% that will be imposed if you sell your shares within 18 months after the last day of the month of purchase, except for certain specific circumstances. See "Shareholder Information-How to Redeem Shares-Class A Shares" for further information about the CDSC waiver categories.

Maximum Deferred Sales Charge (Load) (as a percentage of ____) "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.

+ References+ Details

Maximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.

+ References+ Details