Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Prospectus Date

rr_ProspectusDate

Jan. 28, 2011

Oakmark Global (Prospectus Summary): | Oakmark Global

Risk/Return:

rr_RiskReturnAbstract

Supplement Text

ck0000872323_SupplementTextBlock

HARRIS ASSOCIATES INVESTMENT TRUST
Supplement dated May 11, 2011 to the Prospectus of
The Oakmark Funds dated January 28, 2011

For Oakmark Global Fund, the following replaces the fourth sentence of the first paragraph under "Principal Investment Strategy" on page 18 of the prospectus.

There are no geographic limits on the Fund's non-U.S. investments, and the Fund may invest in securities of companies located in developed and emerging markets.

PROSUPMAY11

Oakmark Global | Class I

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

OAKGX

Oakmark Global | Class II

Risk/Return:

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

OARGX