Ramon Novarro
Archduke Paul 'Gustl' Gustave
Evelyn Laye
Elizabeth Katherine Anne 'Lisl' Gluck
Charles Butterworth
Willy Fitch
Una Merkel
Fanni Kerner
Edward Everett Horton
Baron Szereny
Donald Cook
Toni Berngruber
Henry Stephenson
Emperor Franz Josef
Rosalind Russell
Countess Zarika Rafay
Herman Bing
Nepomuk
Florine Baile
Undetermined Role (uncredited)
Max Barwyn
Max - the Waiter (uncredited)
Art Berry Sr.
Undetermined Role (uncredited) (unconfirmed)
Albert Conti
Mueller (uncredited)
George Davis
Milkman (uncredited)
Carlos De Valdez
Adjutant (uncredited)
Chico De Verdi
Undetermined Role (uncredited) (unconfirmed)
Billy Dooley
Coronetist (uncredited)
Elspeth Dudgeon
Duchess of Reidheim (uncredited)
Kay English
Undetermined Role (uncredited)
Charles Judels
Riccardi (uncredited)
Edith Kingdon
Dowager at Opera House (uncredited)
Michael Mark
Messenger from Restaurant (uncredited)
Torben Meyer
Adjutant (uncredited)
Harry 'Snub' Pollard
Drummer (uncredited)
Christian Rub
Café Proprietor (uncredited)
Charles Unger
Undetermined Role (uncredited)
Gustav von Seyffertitz
Ambassador (uncredited)