Tout Seul (foaled 4 February 2000) is an Irish-bred, British-trained Thoroughbred racehorse and sire. He is best known for his performances as a two-year-old in 2002 when he won five of his seven races including the Shergar Cup Juvenile, Tattersalls Breeders Stakes and Dewhurst Stakes, as well as finishing second in the Two-Year-Old Trophy. In the following year he failed to win in six races but finished fourth in the 2000 Guineas and third in the Irish 2000 Guineas. In 2004 he recorded his first victory in eighteen months when he won the Leicestershire Stakes but was well beaten in his remaining races and was retired at the end of the year. He has made little impact as breeding stallion.