Vigil (foaled 1920) was an American Thoroughbred racehorse best known for winning the 1923 Preakness Stakes in a performance the Los Angeles Times called "the most brilliant victory in the history of the Preakness." Bred by Arthur B. Hancock, Vigil was a bay horse sired by the Hopeful Stakes winner Jim Gaffney. His dam, Vignola, was a great-granddaughter of the British mare Thoughtless, whose other descendants included the 2000 Guineas winner Adam's Apple. Vigil was purchased and raced by Walter J. Salmon, Sr. His trainer was future U.S. Racing Hall of Fame inductee, Thomas "T.J." Healey