- Cary Grant
- Peter Joshua
- Audrey Hepburn
- Regina Lampert
- Walter Matthau
- Hamilton Bartholomew
- James Coburn
- Tex Panthollow
- George Kennedy
- Herman Scobie
- Dominique Minot
- Sylvie Gaudet
- Ned Glass
- Leopold W. Gideon
- Jacques Marin
- Insp. Edouard Grandpierre
- Paul Bonifas
- Mr. Felix
- Thomas Chelimsky
- Jean-Louis Gaudet
- Marc Arian
- Subway Passenger
- Claudine Berg
- Maid
- Marcel Bernier
- Taxi Driver
- Georges Billy
- Man in Stamp Market
- Albert Daumergue
- Man in Stamp Market
- Raoul Delfosse
- Taxi Driver
- Lucien Desagneaux
- Passer-by in the Public Garden
- Stanley Donen
- Man in Elevator
- Colin Drake
- Hamilton Bartholomew
- Mel Ferrer
- Man Smoking Cigarette in Nightclub
- Jean Gold
- Man Who Writes in the Terrace of the Cafe
- Chantal Goya
- Extra
- Clément Harari
- German Tourist
- Monte Landis
- Master of Ceremonies at Les Black Sheep Club
- Bernard Musson
- Hotel Receptionnist
- Antonio Passalia
- Italian Representative in EURESCO
- Jacques Préboist
- Ice Cream Salesman
- Peter Stone
- Man in Elevator / Voice of Marine (uncredited)
- Anthony Stuart
- British Representative in EURESCO
- Michel Thomass
- Embassy Driver
- André Tomasi
- Subway Passenger
- Roger Trapp
- Mortuary Employee
- Louis Viret
- Hallmark Employee in the Subway
