Gunner B (8 March 1973–18 January 2003) was a British Thoroughbred racehorse and sire. In a racing career which lasted from May 1975 until October 1978 he contested thirty-three races, winning fourteen times, finishing second five times and third seven times. Originally trained in Yorkshire, he won twice as a two-year-old in 1975 before becoming a highly successful handicapper in the following season, when he won the Cecil Frail Handicap, Andy Capp Handicap and the Doonside Cup.