NATIONAL MUTUAL FUND

Mellon Nationally Disciplined Value Fund

Supplement of June 17, 2021

to the Summary Prospectus dated March 1, 2021

Capitalized terms and certain other terms used in this supplement, unless otherwise defined in this supplement, have the meanings ascribed to them in the Summary Prospectus.

At a meeting of the Board of Directors (the “Board”) of Nationwide Mutual Funds (the “Trust”) held on June 16, 2021, the Board approved a new Sub-Advisory Agreement with Newton Investment Management North America, LLC (“Newton US”) for the Nationwide Mellon Disciplined Value Fund, a series of the Trust (the “Fund”). The Board approved this agreement because BNY Mellon Investment Management, the parent investment management organization of Mellon Investments Corporation (“Mellon”), the Fund’s sub-advisor, intends to restructure the investment advisory business. of Mellon by transferring the portfolio management staff from Mellon to Newton US (the “Transaction”). Upon closing of the Transaction, which is expected to occur on or about August 31, 2021 (the “Effective Date” ), the Trust’s sub-advisory agreement with Mellon, with respect to the Fund, will terminate and the new sub-advisory agreement with Newton US will become effective. It is currently expected that the portfolio managers of the Fund who are responsible for the day-to-day management of the Fund will remain the same as of the Effective Date.It is also expected that there will be no material change to the Fund’s investment objective or strategies, no reduction in the nature of the Fund’s investment objectives. or d u level of services provided to the Fund, and no increase in management fees payable by the Fund as a result of Newton US’s engagement as a sub-advisor.

From the Effective Date, the Summary Prospectus is amended as follows:

Newton Investment Management North America, LLC

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