Caucasus (14 May 1972 – after 1991) was an American-bred Thoroughbred racehorse and sire who won major races on both sides of the Atlantic. As a young horse he was sent to race in Ireland where he won four of his five races as a three-year-old in 1975 including the Ulster Derby and Irish St. Leger. He then returned to America where he had considerable success in the next two years, winning five races including the Sunset Handicap, Manhattan Handicap, Arcadia Handicap and San Luis Rey Handicap. He had some success as a breeding stallion.