0000916053 2011-04-03 2012-04-02 0000916053 msf4:S000027024Member 2011-04-03 2012-04-02 2012-04-02 MASSMUTUAL SELECT FUNDS 0000916053 2012-12-26 2012-12-26 2011-12-31 false Other MASSMUTUAL SELECT FUNDSSupplement dated December 26, 2012 to theProspectus dated April 2, 2012This supplement provides new and additional information beyond that contained in the Prospectus and any previous supplements. It should be retained and read in conjunction with the Prospectus and any previous supplements.Effective immediately, the following information replaces similar information found in the fifth paragraph under Principal Investment Strategies on page 23 for the BlackRock Global Allocation Fund:The Fund may seek to provide exposure to the investment returns of real assets that trade in the commodity markets, including precious metals, agriculture, energy, livestock, or industrial metals. The Fund may obtain such exposure through, among other things, investments in issuers in commodities-related industries or in other investment vehicles that invest directly in commodities, commodities-related companies, or commodities-related investments, such as exchange-traded funds. The Fund may, but will not necessarily, invest in commodity-linked derivative instruments, including futures contracts, options, and swaps. In order to earn qualifying income under applicable tax rules from commodities and certain commodities-related investments, the Fund may invest up to 25% of its total assets in the MassMutual Select Cayman Global Allocation Fund I, Ltd. (the "Select Cayman Fund"), which was formed in the Cayman Islands and is a wholly-owned subsidiary of the Fund. <center>PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE</center> MASSMUTUAL SELECT FUNDSSupplement dated December 26, 2012 to theProspectus dated April 2, 2012This supplement provides new and additional information beyond that contained in the Prospectus and any previous supplements. It should be retained and read in conjunction with the Prospectus and any previous supplements.Effective immediately, the following information replaces similar information found in the fifth paragraph under Principal Investment Strategies on page 23 for the BlackRock Global Allocation Fund:The Fund may seek to provide exposure to the investment returns of real assets that trade in the commodity markets, including precious metals, agriculture, energy, livestock, or industrial metals. The Fund may obtain such exposure through, among other things, investments in issuers in commodities-related industries or in other investment vehicles that invest directly in commodities, commodities-related companies, or commodities-related investments, such as exchange-traded funds. The Fund may, but will not necessarily, invest in commodity-linked derivative instruments, including futures contracts, options, and swaps. In order to earn qualifying income under applicable tax rules from commodities and certain commodities-related investments, the Fund may invest up to 25% of its total assets in the MassMutual Select Cayman Global Allocation Fund I, Ltd. (the "Select Cayman Fund"), which was formed in the Cayman Islands and is a wholly-owned subsidiary of the Fund. <center>PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE</center>