An American businessman visiting Lisbon gets mistaken for a British secret agent who stole some diamonds. As a result, he has everybody in Lisbon after him.
| Writing | T. E. B. Clarke | Screenplay |
| Writing | Richard L. Breen | Screenplay |
| Writing | David E. Walker | Novel |
| Editing | Alma Macrorie | Editor |
| Directing | Cliff Owen | Director |
| Directing | Ronald Neame | Director |
| Camera | Gábor Pogány | Director of Photography |
| Production | Robert Arthur | Producer |
| Production | James Garner | Executive Producer |
| Production | Ernest B. Wehmeyer | Associate Producer |
| Sound | Bert Kaempfert | Original Music Composer |
| Art | John DeCuir | Art Direction |
| Art | Tom Hale | Art Direction |
| Art | Giuseppe Chevalier | Set Decoration |
| Production | Gilbert Kurland | Unit Production Manager |
| Production | Edward Muhl | Executive In Charge Of Production |
| Sound | William Russell | Sound |
| Sound | Waldon O. Watson | Sound |
| Crew | John Daheim | Stunts |
| Directing | Roberto Fizz | Assistant Director |
| Directing | Mauro Sacripanti | Assistant Director |
| Directing | Douglas Green | Assistant Director |
| Sound | Joseph Gershenson | Music Supervisor |
| Costume & Make-Up | Dimis Kritsas | Wardrobe Coordinator |
| Costume & Make-Up | Jean Louis | Wardrobe Coordinator |
