Heydon is a surname. Notable people with the surname include:
Benjamin Heydon (1567–1607), English Anglican clergyman Charles Heydon (1845–1932), Australian politician and judge Christopher Heydon (1561–1623), English soldier, politician and astrologist Dyson Heydon (born 1943), Australian judge Henry Heydon (died 1504) John Heydon (died 1479) John Heydon (astrologer) (1629 – c. 1667), English philosopher, astrologer and writer John Heydon (footballer) (1928–2012), English footballer Sir John Heydon (died 1653), English Royalist military commander and mathematician Louis Heydon (1848–1919), Australian politician Martin Heydon (born 1978), Irish politician Mike Heydon (1874–1913), American baseball player Nigel Heydon (born 1970), English darts player Rob Heydon (born 1970), Canadian film director