Bob Back (26 May 1981 – January 2011) was an American-bred, British-trained Thoroughbred racehorse and sire. He won the Premio Tevere as a two-year-old and the Valdoe Stakes as a three-year-old, but reached his peak in 1985 when he won the Premio Presidente della Repubblica before recording a 33/1 upset win over a very strong field in the Prince of Wales's Stakes.