Widmann is a German surname. Notable people with the surname include:
Albert Widmann (1912–1986), German chemist and SS officer who worked for the Action T4 program of Nazi GermanyCarolin Widmann (born 1976), German violinist, sister of Jörg WidmannErasmus Widmann (1572–1634), South German composerFrederick Widmann (1859–1925), German-born American architect and philanthropistGottlob Widmann, German company founder and inventorHorst Widmann (born 1938), Austrian painterJohannes Widmann (1460–1498), German mathematician, invented the addition (+) and the subtraction (-) signsJörg Widmann (born 1973), German composer and clarinetist, brother of Carolin Widmann