Freudenstein is a surname. Notable people with the surname include:
Astrid Freudenstein (born 1973), German politician Ferdinand Freudenstein (1926–2006), physicist George Freudenstein (1921–2007), politician Nikolai Freudenstein, alias Yuri Felsen (1894–1943), writer
See also Freudenstein Castle Stahlbahnwerke Freudenstein