David or Dave Williams may refer to:
- Dave "Fat Man" Williams (1920–1982), New Orleans jazz, blues, and rhythm and blues pianist
- David "Happy" Williams (born 1946), Trinidadian jazz double-bassist
- David Williams (guitarist) (1950–2009), American session guitarist
- Dave Williams (singer) (1972–2002), American rock singer
- David Williams (Australian indigenous musician) (born 1983), Aboriginal musician and artist
- David Williams (born 1986), Welsh guitarist in Son of Dork
- David Williams (born 1986), musician formerly with The Dear & Departed
- David Williams, Australian musician with Augie March
- David Williams, head of Shock Records
- David C. Williams (film composer), American film composer
- David Williams (died 1613), English MP for Brecon
- David Rogerson Williams (1776–1830), governor of South Carolina, 1814–1816
- David Williams (Liberal politician) (1799–1869), British Member of Parliament for Merioneth, 1868–1870
- David Williams (Swansea East MP) (1865–1941), British Labour Member of Parliament for Swansea East, 1922–1940
- David G. Williams (died 1903), member of the Wisconsin legislature
- David C. Williams (politician), member of the California legislature
- D. J. Williams (politician) (David James Williams, 1897–1972), British miner and checkweighman who became a Labour Party Member of Parliament
- David B. Williams (politician) (1919–1994), American jurist and politician, member of the Massachusetts House of Representatives
- David Williams (trade unionist) (born 1926), Welsh trade unionist
- Delwyn Williams (David John Delwyn Williams, born 1938), British Conservative politician, MP for Montgomeryshire, 1979–1983
- Sir David Williams (Richmond upon Thames politician) (born 1939), Leader of Richmond upon Thames Council, 1983–2001
- David Williams (Australian politician) (born 1941), Australian politician
- David L. Williams (politician) (born 1953), Kentucky judge, president of the Kentucky Senate and 2011 gubernatorial nominee
- Dave Williams (Colorado politician), member of the Colorado House of Representatives
- Dave Williams (Iowa politician), member of the Iowa House of Representatives
- David Williams (civil servant) (born 1968), British civil servant
- David Williams (Stoke-on-Trent North MP), British Labour Member of Parliament for Stoke-on-Trent North from 2024
- David Williams (Canadian politician), member of the Legislative Assembly of British Columbia from 2024
- David Williams (minister, born 1709) (1709–1784), Welsh independent minister and schoolmaster
- David Williams (philosopher) (1738–1816), Welsh minister, theologian and political polemicist
- David Williams (Oxford academic) (1786–1860), Vice-Chancellor of Oxford University, 1856–1858
- David Archard Williams (fl. 1865–1879), Welsh Anglican priest
- David Williams (priest, born 1841) (1841–1929), Archdeacon of Cardigan, 1903–1928
- David Williams (archdeacon of St David's) (1847–1920), Welsh Anglican priest
- David Williams (archbishop of Huron) (1853–1931), Welsh-born Anglican Bishop of Huron and later Metropolitan of Ontario
- David Williams (priest, born 1862) (1862–1936), Archdeacon of Cardigan, 1928–1936
- David Williams (Methodist minister, born 1877) (1877–1927), Welsh theologian and minister
- David Rhys Williams (1890–1970), American Unitarian minister
- David Williams (bishop of Basingstoke) (born 1961), Anglican Bishop of Basingstoke
- Dai Williams (footballer) (fl. 1912–1921), also known as Dave Williams, English footballer
- David Williams (footballer, born 1931) (1931–2012), English footballer
- Dave Williams (footballer, born 1942) (1942–2015), Welsh football coach and player for Newport County
- David Williams (footballer, born 1955), Welsh football coach and player for Bristol Rovers
- David Williams (footballer, born 1968), English football goalkeeper
- David Williams (Australian soccer) (born 1988), Australian soccer player
Other sports
- David Williams, tennis player; see 1929 Wimbledon Championships – Men's Singles
- Dave Williams (basketball) (1913–1983), American basketball player
- Dave Williams (golf coach) (1918–1998), American college golf coach
- Tiger Williams (David Williams, born 1954), Canadian ice hockey player
- David Williams (judoka) (born 1965), American judoka
- David Williams (sailor) (born 1966), British Olympic sailor
- David Williams (ice hockey) (born 1967), American ice hockey player
- David Williams (born 1972) American wrestler better known by the ring name David Young
- David Williams (card game player) (born 1980), American poker player
- David Williams (American cyclist) (born 1988), American cyclist
- David Williams (Canadian cyclist) (born 1994), Canadian cyclist
- David Williams, darts player; see 2011 PDC Under-21 World Championship
- David Williams, golfer; see Atlantic Open
- David Williams, racing driver; see 1982 British Formula One season
- David John Williams (1885–1970), Welsh-language writer and Welsh nationalist
- David Williams (historian) (1900–1978), Welsh historian
- Gwyn Williams (writer) (David Gwyn Williams, 1904–1990), Welsh poet, novelist, translator and academic
- David Williams (crime writer) (1926–2003), British advertising executive and crime writer
- David Williams (medievalist) (1939–2015), Canadian medieval literature scholar
- David J. Williams (born 1971), American science fiction writer and video game writer
- David Williams (journalist), Australian author and journalist
- David Williams (natural history writer), American natural history writer
- David Williams (businessman, born 1969), British entrepreneur and founder of Avanti Communications Group plc
- David Williams (coal owner) (1809–1863), Welsh industrialist
- David A. Williams, American president and CEO of the Make-A-Wish Foundation
- David Henry Williams (1819–1897), American railroad surveyor, civil engineer and writer
- David Marshall Williams (1900–1975), American inventor
- Russell Williams (criminal) (David Russell Williams, born 1963), Canadian convicted murderer, rapist, and officer in the Canadian Forces