St. Frusquin (1893–1914) was a British Thoroughbred racehorse and sire. In a racing career that lasted from May 1895 to July 1896, he ran eleven times and won nine races. He was the best British two-year-old of 1895 when his five wins included the Middle Park Plate and the Dewhurst Plate. As a three-year-old, he added wins in the 2000 Guineas and two of the season's most valuable all-aged races: the Princess of Wales's Stakes and the Eclipse Stakes. He had a notable rivalry with Persimmon, another outstanding British colt whom he defeated in two of their three racecourse meetings.

The 2000 Guineas Stakes is a Group 1 flat race in Great Britain open to three-year-old thoroughbred colts and fillies. It is run on the Rowley Mile at Newmarket over a distance of 1 mile (1.6 km) and scheduled to take place each year at the start of May.