Arts, entertainment and media
- Dick Thomas was a singer, actor, and American singing cowboy who lived from 1915 to 2003.
- Richard Thomas is an American actor who was born in 1951.
- Richard Thomas is an American author who was born in 1967.
- Richard Thomas was an American dancer who lived from 1925 to 2013.
- Richard Thomas is a British musician, writer, and comedy actor who was born in 1964.
- Richard Thomas was the drummer for the band The Jesus and Mary Chain on their album Automatic.
- Richard K. Thomas is a supporter of live theatre sound and music composition who was born in 1953.
Government and politics
- Richard Thomas (Pennsylvania politician) (1744–1832), member of the United States Congress from Pennsylvania
- Richard L. Thomas (1809–1888), American politician from Maryland
- Richard L. Thomas Jr. (1856–1898), American politician from Maryland
- Richard Thomas (Royal Navy officer) (1932–1998), Admiral and Black Rod in the House of Lords
- Richard C. Thomas (1937–1991), politician and public official in Vermont
- Richard V. Thomas (1932–2010), justice of the Wyoming Supreme Court
- Richard Thomas (solicitor) (born 1949), British lawyer and former Information Commissioner
Religion
- Richard Thomas (1881–1958) was an Anglican bishop and Archdeacon in Australia
- Richard Thomas (1753–1780) was a Welsh Anglican priest and antiquarian
- Richard Rice Thomas (died 1942) was the Archdeacon of St Davids
Sports
- Dick Thomas (rugby league), Welsh rugby league footballer
- Dick Thomas (rugby union) (1883–1916), Welsh rugby union footballer
- Richard Thomas (cricketer, born 1792) (1792–1881), English cricketer
- Richard Thomas (cricketer, born 1867) (1867–1918), English cricketer
- Richard Thomas (shooter) (1941–2016), American shooter, helped create the International Defensive Pistol Association
- Richie Thomas (Richard James Thomas, born 1942), Welsh cricketer
- Ritchie Thomas (Richard John Harold Thomas, 1915–1988), Australian rules footballer
Other people
- Richard Thomas (civil engineer) (1779–1858), an English civil engineer
- Richard Thomas (herpetologist) (born 1938), an American herpetologist
- Richard Thomas (mathematician), a professor of mathematics at Imperial College London
- Richard Thomas (tin plate manufacturer) (1837–1916), a British manufacturer and founder of Richard Thomas & Co Ltd.
- Richard Thomas (Zarvona) (1833–1875), a Confederate colonel and privateer known as "the French lady" during the American Civil War
- Richard Darton Thomas (1777–1857), a Royal Navy officer
- Richard G. Thomas (1930–2006), an American pilot
- Richard Grenfell Thomas (1901–1974), an Australian mineralogist
- Richard F. Thomas (born 1950), a professor of classics at Harvard University
- Richard Walter Thomas (born 1936), a professor who worked on black issues and race relations