Stephen Nash (born 1956) was a British international butterfly swimmer in the mid-1970s. He was part of the England bronze medal team for the 4×100 m medley relay at the 1974 Commonwealth Games in Christchurch, New Zealand. He also won a silver medal for the same event for Great Britain at the 1974 European Swimming Championships in Vienna, Austria. He won 100 m butterfly event at the 6 nations tournament in Minsk, Russia in 1976.