Robert Edmund Sangster (23 May 1936 – 7 April 2004) was a British businessman, thoroughbred racehorse owner and breeder. Sangster's horses won 27 European Classics and more than 100 Group One races, including two Epsom Derbys, four Irish Derbys, two French Derbys, three Prix de l'Arc de Triomphes, as well as the Breeders' Cup Mile and the Melbourne Cup. He was British flat racing Champion Owner five times.