Quick As Lightning (17 March 1977 – 1981) was an American-bred, British-trained Thoroughbred racehorse best known for winning the classic 1000 Guineas in 1980. She was one of the leading British-trained juvenile fillies of 1979, when she won two of her three races including the Hoover Fillies' Mile. In the following year, she finished third on her debut before defeating twenty-two opponents in the 1000 Guineas.