St. Giles was a British Thoroughbred racehorse and sire. In a career that lasted from October 1831 to July 1835 he ran eleven times and won five races. After showing little form as a two-year-old, he made marked improvement to win his first three races of 1832, culminating with a highly-controversial success in The Derby. His only subsequent wins came in two minor races in 1835 and he was eventually sold and exported to stand as a stallion in the United States.

John Gully was an English champion prizefighter who became a racehorse owner and, from 1832 to 1837, a Member of Parliament.