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)