Touchstone (1831–1861) was a British bred Thoroughbred racehorse and a leading sire in Great Britain and Ireland on four occasions. He was owned and bred by Robert Grosvenor, 1st Marquess of Westminster, who bought him for the low price, at the time, of 600 guineas at the insistence of his chief stud groom Mr. Thomas Nutting.

The title of champion, or leading, sire of racehorses in Great Britain and Ireland is awarded to the stallion whose offspring have won the most prize money in Britain and Ireland during the flat racing season. The current (2022) champion is Dubawi, who earned his first title after finishing runner-up multiple times.