Thern is a surname. Notable people with the surname include:
Jonas Thern (born 1967), Swedish association football manager and former professional player who played as a midfielder Károly Thern (1817–1886), Hungarian composer, pianist, conductor and arranger Simon Thern (born 1992), Swedish footballer, and son of Jonas Thern Willi and Louis Thern: Willi (1847–1911) and Louis (1848–1920), Hungarian pianists and teachers
See also Thern Promontory, high ice-covered promontory at the south end of Eisenhower Range in Victoria Land Therns, manipulating and secretive fictional alien race on the planet of Barsoom (Mars) in the novel A Princess of Mars by Edgar Rice Burroughs Thearne Thurne Thürnen