Mother's Day Centennial Commemorative Coin Act - Instructs the Secretary of the Treasury to mint and issue not more than 400,000 $1 coins emblematic of the 100th anniversary of President Wilson's proclamation designating the second Sunday in May as Mother's Day.
Authorizes the Secretary to issue such coins beginning January 1, 2014, except that the Secretary may initiate sales of such coins, without issuance, before such date.
Terminates such minting authority after December 31, 2014.
Requires coin sales to include a $10 surcharge per coin, with distribution of such surcharges to the Susan G. Komen for the Cure and the National Osteoporosis Foundation for the purpose of furthering research.
Prohibits any surcharge if the coin's issuance would cause the number of commemorative coin programs issued during the year to exceed the annual two commemorative coin program issuance limitation.