One in a Million (25 April 1976 – 1992) was an Irish-bred, British-trained Thoroughbred racehorse and broodmare best known for winning the classic 1000 Guineas in 1979. She won both her races as a two-year-old in impressive style and began her three-year-old season with a five length win in the Nell Gwyn Stakes. She won the 1000 Guineas as a short-priced favourite and was awarded victory in the Coronation Stakes on the disqualification of Buz Kashi. She lost her unbeaten record when finishing unplaced in the July Cup and never raced again. After being retired from racing she had considerable success as a broodmare. She died in 1992.