Ralph S. Evinrude (September 27, 1907 – May 21, 1986) was an American business magnate who was chairman of Outboard Marine Corporation, and the husband of singer and entertainer Frances Langford.
Evinrude's father had emigrated from Norway in 1882 and had developed the first commercially feasible outboard motor, thus creating a new industry and form of recreation.
In 1927, Evinrude joined the family firm, Elto Outboard Motor Company after two years at the University of Wisconsin–Madison.
Evinrude and Langford also maintained a cottage on a small island at the east end of Baie Fine, a fjord on the north shore of Georgian Bay, in Lake Huron, in what is now Killarney Provincial Park in Ontario, Canada.
Some of his interests focused on Florida and the marine industry, but others benefited Milwaukee-area hospitals, institutions of higher education and the arts.