Fort Marcy (April 2, 1964 – August 14, 1991) was an American Thoroughbred racehorse. He was a bay gelding, by Amerigo out of Key Bridge, by Princequillo. His grandsire was the important Italian horse Nearco. In 1970 Fort Marcy earned three Champion titles. He was named Horse of the Year in a poll by the publishers of Daily Racing Form, receiving 21 of the 42 votes ahead of Personality (10 votes) and Ta Wee (9 votes). Personality won a rival poll conducted by the Thoroughbred Racing Association. Fort Marcy competed for six years until his retirement at the end of the 1971 racing season. He died in 1991 at Rokeby Farm in Upperville, Virginia. In 1998, he was voted into the National Museum of Racing and Hall of Fame, in Saratoga Springs, New York.