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Marcello Mastroianni as Grand Duke Nicholas Wladimirovitch Goduno |
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Rita Tushingham as Bridget Rafferty |
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Elaine Taylor as Victoria |
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Margaret Blye as Honey |
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Warren Mitchell as Popov |
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Leonard Rossiter as Inspector Dudley |
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Bill Fraser as Bookseller |
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Bryan Pringle as Police Sergeant |
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Francesca Tu as Jeanne Silkingers |
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David Horne as Duke of Windemere |
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Charles Lloyd Pack as Butler |
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Anne Blake as Nashka |
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David Webb as |
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Juba Kennerley as Casino Patron (uncredited) |
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Ian Trigger as Popov's assistant (uncredited) |
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Norman Mitchell as (uncredited) |
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Nora Nicholson as Anastasia Petrovna |
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Rosalind Knight as Museum Visitor in Pink Dress (uncredited) |
| Directing | Christopher Morahan | Director |
| Writing | Ronald Harwood | Writer |
| Production | Pierre Rouve | Executive Producer |
| Writing | Pierre Rouve | Writer |
| Writing | N.F. Simpson | Writer |
| Writing | Ernesto Gastaldi | Writer |
| Production | Carlo Ponti | Producer |
| Production | Selig J. Seligman | Producer |
| Production | Leigh Aman | Associate Producer |
| Sound | Norman Kay | Music |
| Crew | Gerry Turpin | Cinematography |
| Editing | Peter Tanner | Editor |
| Art | Reece Pemberton | Production Design |
| Costume & Make-Up | Dinah Greet | Costume Design |
| Costume & Make-Up | Toni Delaney | Makeup Artist |
| Costume & Make-Up | John O'Gorman | Makeup Artist |
| Production | Bruce Sharman | Production Manager |
