Rees /ˈriːs/ is a Welsh name that traces back to the ancient Celts known as the Britons. The surname was first recorded in Carmarthenshire, and is derived from the personal name Rhys.
It may refer to one of these people:
- Abraham Rees (1743–1825), compiler of Rees's Cyclopaedia
- Alan Rees, British Formula One driver
- Aneurin Rees (1858–1932), Wales rugby union international
- Angharad Rees (born 1949), British actress
- Billy Rees (1924–1996), Welsh international footballer
- Brinley Rees (1919–2004), British classicist
- Celia Rees, British author
- Clive Rees, Wales and British Lions rugby union international
- Dai Rees (born 1913), Welsh golfer
- Damian Rees (born 1978), Welsh composer
- Dan Rees, Welsh international rugby player
- David Benjamin Rees, Welsh publisher, author and preacher
- David Rees (cartoonist) (born 1972), U.S. cartoonist
- Don Rees, warden of Hugh Stewart Hall in the University of Nottingham for 29 years
- Elgan Rees, Wales and British Lions rugby union international
- Elmer Rees, British geometer
- Fernando Rees (born 1985), Brazilian autoracing driver
- Gareth Rees (motorsport commentator), (born 1969) Welsh motorsport commentator
- Gareth Rees (rugby player) (born 1967), Canadian rugby union player
- Geraint Rees, British neurologist and neuroscientist
- Goronwy Rees (1909-1979), Welsh journalist, academician, memoirist, and Soviet spy
- Grover Rees, III (born 1951), U.S. judge and diplomat
- Jason Rees (disambiguation)
- Jean Rees (1914–2004), British artist
- Jeremy Rees (1937–2003), British arts administrator
- Jeremy Rees (Radio Presenter), Welsh broadcaster
- Jerry Rees, U.S. animator and film director
- John Rees (journalist), U.S. journalist
- John Rees (UK politician), British Trotskyist politician
- John Rawlings Rees (1890–1969), British psychiatrist
- Idwal Rees(1910–1991), Wales rugby union captain
- Ivor Rees (1893–1967), Welsh soldier and recipient of the Victoria Cross
- Katie Rees, a former American beauty queen
- Leighton Rees (born 1940), Welsh darts player
- Lionel Wilmot Brabazon Rees (1884–1955), Welsh World War I flying ace
- Lloyd Rees (1895–1988), Australian landscape painter
- Martin Rees, Baron Rees of Ludlow (born 1942), British Astronomer Royal
- Matt Rees, (born 1967) Welsh novelist
- Matthew Rees, Wales and British Lions rugby union international
- Merlyn Rees (1920–2006), British Labour party politician and minister
- Morgan Rees, (born 1988) English economist and solcialist campaigner
- Nathan Rees, (born 1968) Australian politician with the Labor Party, and Premier of New South Wales
- Nigel Rees (born 1944), English writer and broadcaster
- Nigel Rees (footballer) (born 1953), Welsh footballer
- Peter Rees (born 1926), British Conservative party politician
- Robin Rees (Born 1996), Swedish player
- Ronnie Rees, Welsh international footballer
- Roger Rees (born 1944), British-American actor
- Ronnie Rees (born 1944), Welsh footballer
- Sam Rees (born 1991), Welsh-Canadian Designer
- Stuart Rees, director of the Sydney Peace Foundation
- Thomas Rees (Unitarian minister) (1777–1864), Welsh Unitarian minister and scholar
- Thomas Rees (Twm Carnabwth) (c. 1806–1876; also known as Twm Carnabwth), Welsh leader of the Rebecca Riots
- Thomas Rees (Congregational minister) (1815–1885), Welsh Congregationalist minister
- Thomas Ifor Rees (1890–1977), Welsh diplomat and translator
- Tom Rees (rugby union) (born 1984), English rugby union player
- Tommy Rees (1904–1968), Welsh dual-code rugby player
- Trevor Rees-Jones, billionaire, president and CEO of Chief Oil & Gas
- Trevor Rees-Jones (born 1968), British bodyguard and sole survivor of the car crash that killed Diana, Princess of Wales
- Thomas Wynford Rees (1898–1959), British soldier in the British Indian Army
- William Rees (Gwilym Hiraethog) (1802–1883), writer
- William Rees (cinematographer) (1904–1961)
- William James Rees (1913–1967), British hydroid and cephalopod researcher
- William Rees (academic) (born 1943)
- William Rees (veterinarian), Chief Veterinary Officer of the United Kingdom from August 1980 to May 1988
- William Gilbert Rees (1827–1898), explorer, surveyor, and early settler in Central Otago, New Zealand
Rees might also mean:
- Rees, Germany, a city on the lower Rhine
- Rees's Cyclopaedia, a nineteenth-century encyclopedia, particularly rich in coverage of science and technology
- Otway-Rees protocol, a computer network authentication protocol
- Rees River, a river in New Zealand