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Andrée Debar as Geneviève d'Éon / Charles, chevalier d'Éon, agent secret au service du Roi |
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Bernard Blier as le baron d'Exter, le chef des espions à la solde des Prussiens |
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Dany Robin as la comtesse De Monval, l'envoyée spéciale du Roi Louis XV |
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Gabriele Ferzetti as Bernard Turquet de Mayenne |
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Isa Miranda as la tsarine Elisabeth Petrovana de Russie |
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Jean Desailly as le Roi Louis XV |
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Simone Valère as la marquise de Pompadour |
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Jacques Castelot as le marquis de L'Hospital, l'ambassadeur de France en Russie |
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Gisèle Grandpré as Blanche d'Éon de Beaumont |
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Bernard Lajarrige as Pascal d'Éon de Beaumont |
| Directing | Jacqueline Audry | Director |
| Writing | Jacques Rémy | Writer |
| Writing | Ennio De Concini | Writer |
| Writing | Jacques Laurent | Writer |
| Writing | Vittorio Nino Novarese | Writer |
| Art | Maurice Colasson | Production Design |
| Editing | Yvonne Martin | Editor |
| Sound | Carlo Rustichelli | Original Music Composer |
| Camera | Henri Alekan | Director of Photography |
| Camera | Marcel Grignon | Director of Photography |
| Editing | Dolores Tamburini | Editor |
| Costume & Make-Up | Giorgio Hermann | Costume Design |
| Directing | Serge Witta | Assistant Director |
| Costume & Make-Up | Rosine Delamare | Costume Design |
| Directing | Rina Macrelli | Assistant Director |
| Production | Eugène Tucherer | Producer |
| Production | Alfredo De Laurentiis | Production Manager |
| Production | René Chevrier | Producer |
| Production | Alfredo Guarini | Producer |
| Art | Franco Bottari | Set Decoration |
| Art | Alexandre Trauner | Production Design |
| Writing | Pierre Laroche | Writer |
