| Glenn Ford (John Lathrop Davis) |
| Hope Lange (Millicent 'Millie' Mehaffey) |
| Charles Boyer (M. Etienne Pimm) |
| Ricardo Montalban (Le duc Gaspard Ducluzeau) |
| Telly Savalas (Le Dr. Christian Gump, l'oncle de Millie) |
| Ruth McDevitt (Mathilda) |
| Ulla Jacobsson (Janine) |
| Georgette Anys (Mme Gallou) |
| Robert Bettoni (Milkman) |
| Mony Dalmès (Mme Fernier) |
| Laurence Hardy (Prieury) |
| Jean Le Maitre (Carlo) |
| André Luguet (Maurice Zoltan) |
| Jean Parédès (Freddie) |
| Redmond Phillips (Starcy) |
| Erika Soucy (Gretl) |
| Aram Stephan (Gallou) |
| Olga Valéry (Mme Giardin) |
| John Wood (Julian Soames) |
| Jean-Pierre Zola (Mueller) |