Mrs McArdy (1974 – 5 August 1991) was a British Thoroughbred racehorse and broodmare best known for winning the classic 1000 Guineas in 1977. She won four minor races as a two-year-old in 1977 before emerging as a top class performer in the following year. As a three-year-old she won the Tote Free Handicap before winning the Guineas as a 16/1 outsider. She went on to win the Fen Ditton Stakes when conceding weight to colts and older horses and then took the Strensall Stakes.
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