La Fleche (1889–1916) was a British Thoroughbred racehorse and broodmare. After being sold for a world record price as a yearling in 1890, she was undefeated as a two-year-old in 1891, winning races against her own sex and defeating some of the year's leading colts. She went on to become the dominant British three-year-old of 1892, claiming the Fillies’ Triple Crown by winning the 1000 Guineas at Newmarket, the Oaks at Epsom and the St Leger at Doncaster. Her only defeat of the year came when she finished second when starting favourite for The Derby.

The Triple Crown of Thoroughbred Racing, often shortened to Triple Crown, is a series of horse races for Thoroughbreds, often restricted to three-year-olds. Winning all three of these Thoroughbred horse races is considered the greatest accomplishment in Thoroughbred racing. The term originated in mid-19th-century England and nations where Thoroughbred racing is popular each have their own Triple Crown series.