USS Mapiro (SS-376), a Balao-class submarine, was a ship of the United States Navy named for the mapiro, a fish of the Gobioidea suborder occurring off the West Indies and the Atlantic coasts of Central America and Mexico. Mapiro was laid down by Manitowoc Shipbuilding Co., Manitowoc, Wisc., 30 May 1944; launched 9 November 1944; sponsored by Mrs. Philip H. Ross; and commissioned 30 April 1945, Commander Vincent A. Sisler, Jr., in command. On 16 March 1946 Mapiro decommissioned to enter the Pacific Reserve Fleet at Mare Island, Calif., 1 January 1947.