Only 13 horses have ever won the United States Triple Crown, which consists of winning the Kentucky Derby, Preakness Stakes, and Belmont Stakes in a single season. The winners are:
- Sir Barton (1919)
- Gallant Fox (1930)
- Omaha (1935)
- War Admiral (1937)
- Whirlaway (1941)
- Count Fleet (1943)
- Assault (1946)
- Citation (1948)
- Secretariat (1973)
- Seattle Slew (1977)
- Affirmed (1978)
- American Pharoah (2015)
- Justify (2018)
This list reflects the historic rarity of the achievement in American thoroughbred racing.
