A.P. Indy (born 1989) is a champion stallion Thoroughbred racehorse bred in Kentucky, USA, by William Farish III and William Kilroy. He is known for his ancestry, his own record, and his successful progeny. He was sired by Triple Crown winner Seattle Slew through mare Weekend Surprise, who herself was sired by another Triple Crown winner: Secretariat. He was the top-priced yearling of 1990 at $2.9 million.

Trained by Hall of Famer Neil Drysdale, A.P. Indy raced in 1991 and 1992. As a two-year old, he won the Grade I Hollywood Futurity. At three, he took the Grade I Breeders' Cup Classic, the Belmont Stakes, the Grade I Santa Anita Derby, the Grade II San Rafael Stakes, the Grade II Peter Pan Stakes, and came third in the Jockey Club Gold Cup. In 1992, he was voted the Eclipse Award for Horse of the Year and the Eclipse Award Champion three year old. In his career he had 11 starts, winning 8 and showing in one, earning a total of $2,979,815.

A.P. Indy was inducted into the National Museum of Racing and Hall of Fame in 2000.