 William PowellBaron Stephan Wolensky | Baron Stephan Wolensky |
 Luise RainerCountess Olga Mironova | Countess Olga Mironova |
 Robert YoungGrand Duke Peter | Grand Duke Peter |
 Maureen O'SullivanMaria Orlich | Maria Orlich |
 Frank MorganColonel Baron Suroff | Colonel Baron Suroff |
 Henry StephensonPrince Johann | Prince Johann |
 Bernadene HayesMitzi Reisenbach | Mitzi Reisenbach |
 Donald KirkeAnton, the Thief | Anton, the Thief |
 Douglass DumbrilleMr. Korum, a Conspirator | Mr. Korum, a Conspirator |
| CCharles WaldronDr. Malchor, a Conspirator | Dr. Malchor, a Conspirator |
 Ian WolfeLeon, a Conspirator | Leon, a Conspirator |
 Barnett ParkerAlbert, Stephan's Butler | Albert, Stephan's Butler |
 Frank ReicherPavloff | Pavloff |
 Bert RoachHotel Clerk | Hotel Clerk |
 Paul PorcasiSantuzzi | Santuzzi |
 E. E. CliveAuctioneer | Auctioneer |
 Emma DunnAnna - Olga's Housekeeper | Anna - Olga's Housekeeper |
 Frank ConroyCol. Radoff | Col. Radoff |
 George DavisWaiter (uncredited) | Waiter (uncredited) |
 Carole LandisBidder (uncredited) | Bidder (uncredited) |
 Theodore von EltzAdjutant to Prince Johann (uncredited) | Adjutant to Prince Johann (uncredited) |
 Russ PowellCoachman (uncredited) | Coachman (uncredited) |
 Torben MeyerTrain Announcer (uncredited) | Train Announcer (uncredited) |
 John PicorriItalian Ambassador (uncredited) | Italian Ambassador (uncredited) |
 Alphonse MartellMarcel Garnier (uncredited) | Marcel Garnier (uncredited) |
 Franklyn FarnumBidder (uncredited) | Bidder (uncredited) |
 Olaf HyttenConspirator (uncredited) | Conspirator (uncredited) |
 Rollo LloydJailer (uncredited) | Jailer (uncredited) |
 Roland VarnoCzar's Officer (uncredited) | Czar's Officer (uncredited) |
 Dorothea WolbertBidder (uncredited) | Bidder (uncredited) |
