Kassner is a surname. Notable people with the surname include:

Edward Kassner (1920–1996), music executive Eli Kassner (1924–2018), guitar teacher and musician Helmut Kassner (born 1946), motorcycle road racer Helmut Kassner (military officer) (1897–1960) Horst Kassner, motorcycle road racer Kerstin Kassner (born 1958), German politician Rudolf Kassner (1873–1959), writer

See also Kasner