Buoy (7 April 1970 – 1984) was a British Thoroughbred racehorse and sire. Unraced as a two-year-old, he proved himself one of the best middle-distance colts of his generation in 1973 when he won the Predominate Stakes and the Great Voltigeur Stakes and finished placed in both the Irish Derby and the St Leger. He was even better as a four-year-old, winning the Yorkshire Cup before beating the outstanding French filly Dahlia in the Coronation Cup and taking the Princess of Wales's Stakes. His career was ended by injury in August 1974 and he was exported to stand as a breeding stallion where he had limited success as a sire of winners.