David, Dave, or Dai Thomas may refer to:

• David Thomas (educationalist) (1880–1967), Welsh educationalist and politician
• David A. Thomas (academic) (born 1956), American psychologist, president of Morehouse College, Atlanta
• David A. Thomas (educator) (1917–2004), American educator, the dean of the Johnson School at Cornell
• David Oswald Thomas (1924–2005), Welsh philosopher at Aberystwyth University
• David Winton Thomas (1901–1970), British scholar of Hebrew
• J. David Thomas (born 1931), British papyrologist and classical scholar

• David Thomas, pen name of Dave Thompson (author) (born 1960), English writer about music
• David Thomas (Dewi Hefin) (1828–1909), Welsh poet and schoolteacher
• David N. Thomas (born 1945), Welsh writer
• David St John Thomas (1929–2014), English publisher and writer
• Diana (formerly David) Thomas (born 1959), English writer, also known under her pen name Tom Cain

• Dave Thomas (born 1936), stage name of American broadcaster and weatherman Dave Roberts (David Boreanaz) when he was at WKBW-TV Buffalo
• David Thomas (born 1966), musician with Take 6
• David Thomas (bass) (born 1943), British early-music and baroque-music singer
• David Thomas (composer) (1881–1928), Welsh composer
• David Thomas (musician) (born 1953), American musician, member of group Pere Ubu
• David Vaughan Thomas (1873–1934), composer, organist, pianist and music administrator

• Dave Thomas (actor) (born 1948), Canadian actor and comedian
• David A. Thomas (voice actor) (born 1955), American voice actor and painter

• David Thomas, former director of Newcastle Art Gallery, Newcastle, Australia

• David and Tonya Thomas, Baltimore chefs, restaurateurs, and food historians
• David Thomas (British businessman) (born 1963), British businessman, CEO of Barratt Developments
• David Thomas (industrialist) (1794–1882), Welsh industrialist
• D. A. Thomas (David Alfred Thomas, 1856–1918), Welsh industrialist and politician
• David A. Thomas (software developer), Canadian software technology figure
• Dave Thomas (businessman) (1932–2002), founder, former chairman & spokesperson of the North American Wendy's fast-food chain
• David Chandler Thomas (1954–2021), American economist and technology executive

• David Thomas (British politician) (1892–1954), Welsh Labour politician
• David Thomas (educationalist) (1880–1967), Welsh educationalist and politician
• David Thomas (MEP) (born 1955), British Labour politician
• David Thomas (New York politician) (1762–1831), American politician, Congressman from New York
• David Thomas (Texas politician) (1795–1836), American politician, signer of Texas Declaration of Independence
• David L. Thomas (born 1949), American politician, South Carolina state senator
• Dave Thomas (politician) (born 1965), American politician from Alabama

• David Thomas (archdeacon of Cardigan) (died 1951), Welsh priest
• David Thomas (archdeacon of Gower) (1897–1971), Welsh Anglican priest
• David Thomas (archdeacon of Montgomery) (1833–1916), Welsh priest and historian
• David Thomas (bishop) (1942–2017), Welsh bishop
• David Thomas (missionary priest) (1829–1905), Welsh priest
• David Thomas (Protestant minister, born 1813) (1813–1894), Welsh preacher and publisher

• David Thomas (Canadian scientist), Canadian biochemist
• David Thomas (geographer) (born 1958), British geographer
• Dave Thomas (programmer) (born 1956), British-American computer programmer and writer
• Dave Thomas (skeptic) (born 1953), American physicist and mathematician known for his scientific skepticism
• David A. Thomas (academic) (born 1956), American psychologist and academic
• David Gilbert Thomas (1928–2015), British-American chemist and physicist
• David Hurst Thomas (born 1945), American archaeologist

• Dai Thomas (footballer, born 1926) (1926–2014), Swansea City A.F.C. and Welsh international footballer
• Dai Thomas (footballer, born 1975), Welsh footballer
• Dave Thomas (footballer, born 1917) (1917–1991), English footballer
• Dave Thomas (footballer, born 1950), English footballer
• Lyn Thomas (footballer) (David Stuart Lynne Thomas, 1920–1993), Welsh footballer

• Dai Thomas (rugby league) (1879–1958), rugby league footballer of the 1900s for Other Nationalities, and Oldham
• Dai Thomas (rugby union) (1909–?), Welsh international rugby player
• Dave Thomas (rugby union, born 1941) (1941–2017), Welsh rugby player
• Dave Thomas (rugby union, born 1988), New Zealand rugby player
• David Thomas (rugby league), rugby league footballer of the 1900s for Wales, Halifax, and Mid-Rhondda
• David John Thomas (1879–1925), Welsh international rugby player

• David Thomas (cricketer, born 1911) (1911–2001), Welsh cricketer
• David Thomas (cricketer, born 1959) (1959–2012), English cricketer
• David Thomas (cricketer, born 1963), former English cricketer

• David Thomas (American football) (born 1976), American football Linebacker
• David Thomas (American football) (born 1983), American football tight end
• David Thomas (Canadian football) (born 1951), American football cornerback
• Dave Thomas (cornerback) (born 1968), American football cornerback

• Dave Thomas (baseball) (1905–1968), Negro league baseball player
• Dave Thomas (basketball) (born 1976), Canadian basketball player
• David Thomas (beach volleyball) (born 1974), Trinidad and Tobago beach volleyball player
• David Thomas (boxer) (1937–1980), British Olympic boxer
• David Thomas (field hockey) (1927–2024), British Olympic hockey player
• Dave Thomas (golfer) (1934–2013), Welsh golfer

• David Cuthbert Thomas (1896–1916), Welsh soldier of the First World War
• David Courtney Thomas, American murder victim
• David Thomas (murderer) (died 1995), executed Vincentian criminal
• David M. Thomas Jr. (born 1958), officer in the United States Navy
• David Thomas (jeweller) (born 1942), Crown Jeweller for the British monarchy
• David Thomas (judge), Justice of the Supreme Court of Queensland

• All pages with titles containing David Thomas
• Davyd Thomas (born 1956), Deputy Chief of Navy, Royal Australian Navy
• David Clayton-Thomas (born 1941), musician and lead singer of Blood, Sweat & Tears
• Thomas (surname)