Gareth Williams may refer to:
Arts and entertainment
edit- Gareth Williams (British musician) (1953–2001), member of English group This Heat
- Gareth F. Williams (1955–2016), Welsh novelist and television writer
- Gareth Williams (composer) (born 1977), Irish composer
- Gareth Williams (New Zealand actor) (born 1987), New Zealand television, film and theater actor
- Gareth Williams (American actor), American actor
Sports
editAssociation football (soccer)
edit- Gareth Williams (footballer, born 1941) (1941–2018), English-born Welsh footballer
- Gareth Williams (footballer, born 1967), English footballer
- Gareth Williams (footballer, born 1981), Scottish footballer
- Gareth Williams (footballer, born 1982), South African-born Welsh footballer
Rugby
edit- Gareth Williams (rugby union, born 1954) (1954–2018), Wales and British Lions international rugby union player
- Gareth Williams (rugby union, born 1978), Wales international rugby union hooker
- Gareth Williams (rugby union, born 1981), Welsh rugby union flanker
- Gareth Williams (rugby union, born 1988), Welsh rugby union scrum-half
Other sports
edit- Gareth Williams (cricketer) (born 1973), English cricketer
- Gareth Williams (tennis), South African tennis player
Others
edit- Gareth Williams, Baron Williams of Mostyn (1941–2003), Welsh barrister and Labour politician
- Gareth V. Williams (born 1965), English-American astronomer at the Minor Planet Center
- Gareth Wyn Williams (1978–2010), Welsh mathematician, employee of Britain's GCHQ signals intelligence agency, found dead in 2010
- Gareth Williams (Latin Americanist) (fl. 1990s), Latin Americanist, member of Latin American subaltern studies group