Samuel Clay Hildreth (May 16, 1866 – September 24, 1929) was an American Thoroughbred horse racing Hall of Fame trainer and owner.Born in Independence, Missouri, Sam Hildreth began his training career in 1887, competing at racetracks in the Midwestern United States with such horses as the good racemare Hurley Burley, the dam of Burgomaster. In 1898 he moved to New York City where thoroughbred racing was a leading sport offering the largest purses.