Thomason is a patronymic surname meaning "son of Thomas" or a misspelling of the French surname Thomasson, Thomesson "little Thomas". There are varied spellings. Notable people with the surname include:
Art Thomason (1889–1944), American baseball playerBob Thomason, basketball coach at the University of the Pacific.Bobby Thomason (born 1928), American football playerSergeant Clyde A. Thomason (1914–1942), United States Marine and Medal of Honor awardeeDustin Thomason, American writerGeorge Thomason (died 1666), English book collectorHarry Thomason (born 1940), American film and television producerJames Thomason (1804–1853), British Lieutenant-Governor of the North-Western Provinces in IndiaJasin Thomason (born 1976), guitarist for American rock band The AtarisJeff Thomason (born 1969), American football tight endJim Thomason (1920–2007), American football halfbackJohn Thomason (1893–1944), United States Marine and authorMarsha Thomason (born 1976), English actressR. Ewing Thomason (1879–1973), American politician and Speaker of the Texas House of RepresentativesRobert Wayne Thomason (1952–1995), American mathematicianRoy Thomason (born 1944), British Conservative Party politicianSarah Thomason, American linguistTrent Thomason (born 1972), Christian keyboardist and songwriterTheresa Thomason, American gospel singerYeoville Thomason (1826–1901), Birmingham architectLinda Bloodworth-Thomason (born 1947), American writer and television producerLorene Thomason Coates, Democratic member of the North Carolina General AssemblySir Wilfred Thomason Grenfell (1865–1940), medical missionary to Newfoundland and Labrador