John Nunn (born 1955) is an English chess grandmaster.
John Nunn may also refer to: John Nunn (sailor) (1803–1860), English sailor and author John Nunn (rower) (born 1942), American Olympic rower John Nunn (racewalker) (born 1978), American Olympic race walker John Nunn (RAF officer) (1919–2013), British Royal Air Force officer, mathematician, and politician John Nunn (cricketer) (1906–1987), English cricketer John F. Nunn, dean of the Royal College of Anaesthetists, 1979–1982