Британдық тауай шабысының чемпионы Сент-Саймон

British bred Thoroughbred racehorse

St. Simon (1881 – April 2, 1908) was an undefeated British Thoroughbred racehorse and one of the most successful sires in the history of the Thoroughbred. In May 1886 The Sporting Times' carried out a poll of one hundred experts to create a ranking of the best British racehorses of the 19th century. St. Simon was ranked fourth, having been placed in the top ten by 53 of the contributors.

St. Simon was bred by Prince Gustavus Batthyany of Hungary and foaled at William Barrow's Paddocks near Newmarket. He was by Galopin, also owned by Batthyany, who won 10 out of 11 races including The Derby. Retired to stud in 1876, Galopin was not an immediate success, covering only 12 mares in his first crop. His stud fee dropped as low as 50 guineas before the success of first Galiard in the 1883 2000 Guineas and then St. Simon established his reputation. Galopin eventually became the leading sire in Great Britain and Ireland in 1888, 1889, and 1898. St. Simon's dam, St. Angela (by King Tom), was disappointing as a broodmare up to the time she produced St. Simon, her sixth foal, at age 16. Her other notable progeny was a full sister to St. Simon named Angelica, who later became the dam of champion and major stallion Orme (1889 by Ormonde).

St. Simon was a brown colt with a small star on his forehead and a few white hairs on the inside of his pasterns and heels. Almost all the foals he sired were bay or brown, with the exception of a gray filly (Tsu Shima) and a gray colt (Posthumus), both out of gray mares. His final height was 16 or (sources differ), but his fine build made him look smaller. His offspring, especially his fillies, were usually slightly smaller than average. He had a fine head that was slightly dished, clean legs—although quite over at the knee—and a short back. He also had strong quarters and a very good shoulder, which according to the 1916 Bloodstock Breeders Review was "a study. So obliquely was [the shoulder] placed that it appeared to extend far into his back, making the latter look shorter." His girth was said to be , and his cannon bone measured around.

Prince Batthyany died in May 1883 while attending the 2000 Guineas, won by his colt Galiard. St. Simon won very easily by six lengths. St. Simon's first official race of the year was a walkover at the 10 furlong Epsom Gold Cup. He then won the 2½ mile Ascot Gold Cup by 20 lengths, despite having trailed in the beginning of the race, to beat Tristan and Faugh a Ballagh. He did not recover, however, and never raced again, beginning his breeding career at the age of five.