William Powell
Baron Stephan Wolensky
Luise Rainer
Countess Olga Mironova
Robert Young
Grand Duke Peter
Maureen O'Sullivan
Maria Orlich
Frank Morgan
Colonel Baron Suroff
Henry Stephenson
Prince Johann
Bernadene Hayes
Mitzi Reisenbach
Donald Kirke
Anton, the Thief
Douglass Dumbrille
Mr. Korum, a Conspirator
Charles Waldron
Dr. Malchor, a Conspirator
Ian Wolfe
Leon, a Conspirator
Barnett Parker
Albert, Stephan's Butler
Frank Reicher
Pavloff
Bert Roach
Hotel Clerk
Paul Porcasi
Santuzzi
E. E. Clive
Auctioneer
Emma Dunn
Anna - Olga's Housekeeper
Frank Conroy
Col. Radoff
George Davis
Waiter (uncredited)
Carole Landis
Bidder (uncredited)
Theodore von Eltz
Adjutant to Prince Johann (uncredited)
Russ Powell
Coachman (uncredited)
Torben Meyer
Train Announcer (uncredited)
John Picorri
Italian Ambassador (uncredited)
Alphonse Martell
Marcel Garnier (uncredited)
Franklyn Farnum
Bidder (uncredited)
Olaf Hytten
Conspirator (uncredited)
Rollo Lloyd
Jailer (uncredited)
Roland Varno
Czar's Officer (uncredited)
Dorothea Wolbert
Bidder (uncredited)
Spencer Charters
Usher (uncredited)
Gino Corrado
Inn Patron (uncredited)
Clarence Wilson
Stationmaster (uncredited)
Philo McCullough
Conspirator (uncredited)
Leonard Carey
Valet to Wolensky (uncredited)
Jules Cowles
Bidder (uncredited)
King Baggot
Customs Official (uncredited)
Sidney Bracey
Maria's Footman (uncredited)
Alexander Pollard
Bidder (uncredited)
Edmund Mortimer
Man at Auction (uncredited)
George Fitzmaurice
Director
Harold Goldman
Writer
Baroness Emmuska Orczy
Novel
Conrad A. Nervig
Editor
Cedric Gibbons
Art Direction
Adrian
Costume Design
John W. Considine Jr.
Producer
Harold Rosson
Director of Photography
Franz Waxman
Original Music Composer
Herman J. Mankiewicz
Dialogue