Thomasson is a surname. Notable people with the surname include:
Ben Thomasson, character in Men in Trees, American romantic television dramedy series on ABCBenny Thomasson (1909–1984), American fiddler in the Texas style of old-time fiddlingFranklin Thomasson (1873–1941), English 19th century MPGary Thomasson (born 1951), former outfielder in Major League BaseballHughie Thomasson (1952–2007), American guitarist and singer, founding member of OutlawsJerry Thomasson (1931–2007), Democratic member of the Arkansas House of RepresentativesJohn Pennington Thomasson (1841–1904), English cotton spinner and Liberal Party politicianSarah Thomasson (1925–1996), Swedish Alpine skierThomas Thomasson (1808–1876), political economist and a campaigner for the repeal of the Corn LawsWilliam Thomasson (1797–1882), U.S. Representative from Kentucky