William Nunez Heysham (19 July 1828 – 12 December 1905) was an English first-class cricketer and barrister.
Heysham was born at Marylebone in July 1828, son of William Henry Heysham.
He studied law at Trinity College, Oxford.
He was a student at the Inner Temple, from where he was called to the bar in June 1853.
He made a single appearance in first-class cricket in 1855 for the Surrey Club against the Marylebone Cricket Club at Lord's.
He batted in both Surrey Club innings', being dismissed for 9 by Jemmy Dean in their first-innings, while in their second-innings he was dismissed by the same bowler for 13.