Harry Ford Sinclair (July 6, 1876 – November 10, 1956) was an American industrialist, and the founder of Sinclair Oil. He was implicated in the 1920s Teapot Dome scandal, and served six months in prison for contempt of Congress. Although this harmed his reputation, he returned to his former life and enjoyed its prosperity until his death.
Sinclair was an avid owner of sports properties, one of the principal financial backers of baseball's Federal League and a force in U.S. thoroughbred racing. Horses from his stable won the Kentucky Derby and three Belmont Stakes.