 Joel McCreaBarry Corvall | Barry Corvall |
 Brenda MarshallBrenda Ballard | Brenda Ballard |
 Jeffrey LynnLowell Warrington | Lowell Warrington |
 Nana BryantMrs. Corvall | Mrs. Corvall |
 Martin KosleckKarl 'Muller' Mullen | Karl 'Muller' Mullen |
 Rudolph AndersPaul Strawn (as Robert O. Davis) | Paul Strawn (as Robert O. Davis) |
 James StephensonDr. Anton Rader | Dr. Anton Rader |
 George BancroftDudley Garrett | Dudley Garrett |
 Stanley RidgesHamilton Peyton | Hamilton Peyton |
 Howard HickmanWalter Forbes | Walter Forbes |
 Hans Heinrich von TwardowskiDr. Helm | Dr. Helm |
 George DavisSwiss Gendarme (uncredited) | Swiss Gendarme (uncredited) |
 Lucien PrivalDecker | Decker |
 Addison RichardsBruce Corvall | Bruce Corvall |
 Edwin StanleySecretary of State | Secretary of State |
 Granville BatesPhineas T. O'Grady | Phineas T. O'Grady |
 Grace HayleMrs. O'Grady | Mrs. O'Grady |
 Egon BrecherLarsch | Larsch |
 Emmett VoganInstructor | Instructor |
 Enrique AcostaGeneva Restaurant Patron | Geneva Restaurant Patron |
 Eddie AcuffMinor Role | Minor Role |
 Louis AdlonYouth | Youth |
| JJimmy AyeGeneva Restaurant Patron | Geneva Restaurant Patron |
| FFern BarryAmerican Tourist | American Tourist |
 Sven Hugo BorgChauffeur | Chauffeur |
 Sidney BraceyShip Steward | Ship Steward |
| JJames CarlisleBall Guest | Ball Guest |
 Glen CavenderMan in O'Grady Crowd | Man in O'Grady Crowd |
| LLoia CheaneyAmerican Tourist | American Tourist |
| JJames ConatyBall Guest | Ball Guest |
