Yvonne De Carlo
— Minna Planer
Carlos Thompson
— Franz Liszt
Rita Gam
— Cosima Liszt
Valentina Cortese
— Mathilde Wesendonk
Alan Badel
— Richard Wagner
Peter Cushing
— Otto Wesendonk
Frederick Valk
— Minister von Moll
Gerhard Riedmann
— King Ludwig I
Erik Schumann
— Hans von Bülow
Robert Freitag
— August Röckel
Heinz Klingenberg
— König von Sachsen
Charles Regnier
— Giacomo Meyerbeer
Fritz Rasp
— Pfistermeister
Kurt Großkurth
— Theater Manager
Hans Quest
— Robert Hubner
Erich Wolfgang Korngold
— Hans Richter (uncredited)