Thomas Simpson (1710–1761) was a British mathematician and inventor.
Thomas, Tom, or Tommy Simpson may also refer to:
Sports Tom Simpson (footballer) (1879–1950), English footballer for Port Vale and Bury Thomas Simpson (cricketer) (1879–1961), English cricketer Tom Simpson (golfer) (1877–1964), English professional golfer Tommy Simpson (rugby union) (1881-1956), English international rugby union player Tommy Simpson (footballer, born 1904) (1904–after 1928), Scottish football outside right active in the 1920s Duke Simpson (1927–2021), real name Thomas Leo Simpson, American baseball pitcher and member of 1953 Chicago Cubs Tommy Simpson (footballer, born 1931) (1931–2015), Scottish football defender active in the 1950s Thomas Simpson (footballer) (1933–2016), Australian footballer Tom Simpson (1937–1967), English road racing cyclist of the 1960s Tom Simpson (ice hockey) (born 1952), Canadian ice hockey player Tom Simpson (cricketer) (born 1974), English cricketer
Arts and entertainment Thomas Simpson (composer) (1582–c. 1628), English composer Thomas Simpson (actor), English stage actor of the late seventeenth and early eighteenth century Tom Simpson, producer and editor of My Family Online Tom Simpson (musician) (born 1972), Scottish musician, keyboard player for the band Snow Patrol
Other Thomas Simpson (architect, born 1816) (1816–1880), architect of Nottingham Thomas Simpson (architect, born 1825) (1825–1908), architect to the Brighton School Board Thomas Simpson (engineer) (1755–1823), British civil engineer Thomas Simpson (explorer) (1808–1840), explorer with the Hudson's Bay Company Thomas Blantyre Simpson (1892–1954), Scottish lawyer Thomas C. Simpson, American businessman, jurist, and politician from Massachusetts Thomas Edward Simpson (1873–1951), Canadian politician Thomas Joseph Simpson (1921–2017), Canadian recipient of the Distinguished Service Medal Thomas W. Simpson (born 1975), scholar, teacher, and writer in the fields of religion, human rights, and social justice
See also Thomas Simpson Cooke (1782–1848), Irish composer