Richard Thorpe Director Ann Blyth Kathie Actor Edmund Purdom Prince Karl Actor John Ericson Count Von Asterburg Actor Louis Calhern King of Karlsberg Actor Edmund Gwenn Prof. Juttner Actor S.Z. Sakall Joseph Ruder Actor Betta St. John Princess Johanna Actor John Williams Lutz Actor Evelyn Varden Queen Matilda Actor John Hoyt Prime Minister Actor Richard Anderson Lucas Actor Mario Lanza Prince Karl (singing voice) Voice Dorothy Donnelly Writer Wilhelm Meyer-Förster Writer, Writer Joe Pasternak Producer Nicholas Brodszky Original Music Sigmund Romberg Non-Original Music Paul Vogel Cinematographer Randall Duell Art Director Cedric Gibbons Art Director Arthur Krams Set Decoration Edwin B. Willis Set Decoration Walter Plunkett Costume Design Helen Rose Costume Design