William Rees

William Rees may refer to:

Sports

 * William Rees (rugby) (1899–1968), rugby union and rugby league footballer of the 1920s and 1930s
 * William Lee Rees (1836–1912), English-born New Zealand cricketer, politician and lawyer
 * Billy Rees (1924–1996), association footballer of the 1940s and 1950s

Religious figures

 * William Rees (priest and writer) (1859–1936), earlier Welsh Anglican priest
 * William Jenkins Rees (1772–1855), Welsh cleric and antiquary
 * William Rees (archdeacon of St Asaph) (1905–?), later Welsh Anglican priest

Others

 * William Rees (Liberal politician), in 1390 MP for Norfolk
 * William Hurst Rees (1917–2004), British surveyor and member of the Lands Tribunal
 * William James Rees (1913–1967), British hydroid and cephalopod researcher
 * William E. Rees (born 1943), originator of "ecological footprint" concept
 * William Rees (cinematographer) (1904–1961), American cinematographer
 * William Rees (Gwilym Hiraethog) (1802–1883), writer
 * William Rees (veterinary surgeon) (1928–2018), Chief Veterinary Officer of the United Kingdom, 1980–1988
 * William Gilbert Rees (1827–1898), explorer, surveyor, and early settler in Central Otago, New Zealand