Mon Fils (foaled 1970) was a British Thoroughbred racehorse and sire, best known for winning the classic 2000 Guineas in 1973. As a two-year-old, Mon Fils won two of his seven races including the Mill Reef Stakes. In 1973 he won the 2000 Guineas on soft ground, but ran poorly when strongly fancied for the Epsom Derby. His racing career was ended by injury in the autumn of 1973 and he was retired to stud, where he made no impact as a sire of winners. He was the first classic winner to be trained by Richard Hannon, Sr..