Sondheim is a surname. Notable people with the surname include:
Alan Sondheim, American poet and critic Erna Sondheim (1904–2008), German female fencer Stephen Sondheim (1930–2021), American stage musical and film composer and lyricist
Sondheimer (1840, Eppingen - 1899, Heidelberg), German rabbi Franz Sondheimer (1926–1981), German-British chemist