Polygamy (foaled 16 March 1971) was a British Thoroughbred racehorse, best known for winning the classic Epsom Oaks in 1974. As a two-year-old in 1973, she showed promise by winning three races and finishing fourth in the Critérium des Pouliches. In the following spring she won the 1000 Guineas Trial Stakes and was narrowly beaten in the 1000 Guineas before winning the Oaks. She was retired after being beaten in her only subsequent race and died without producing a foal.