Sir Martin (1906–1930) was a Thoroughbred racehorse that was foaled in 1906 in Lexington, Kentucky at Hamburg Place, the stud farm of noted turfman and horse trainer John E. Madden. Sir Martin was a half brother to the first Triple Crown winner Sir Barton, and he raced in the United States, Great Britain and France. Sir Martin was the betting favorite for the 1909 Epsom Derby, but stumbled and threw his jockey at the Tattenham Corner turn, allowing King Edward VII's horse Minoru to win.