Glynis Johns
— Cary
Rossano Brazzi
— Bertrand
Robert Morley
— Dreuther
Tony Britton
— Philip
Felix Aylmer
— The Other
Joyce Carey
— Bird's Nest
Geoffrey Keen
— Reception Clerk
Peter Illing
— Stranger with "The System"
Albert Lieven
— Hotel Manager
Mona Washbourne
— Nurse (uncredited)
A.E. Matthews
— Man
Hyma Beckley
— Casino Patron (uncredited)
Joan Benham
— Miss Bullen (uncredited)
Paul Beradi
— Casino Patron (uncredited)
Carl Bernard
— Steward (uncredited)
Bryan Coleman
— Elegant Man at Casino (uncredited)
Marianne Deeming
— Hotel Maid (uncredited)
Shirley Anne Field
— Attractive Girl in Salle Rivée (uncredited)
Alex Gallier
— Casino Attendant (uncredited)
Armand Guinle
— Official at Mairir (uncredited)
Walter Hudd
— Arnold (uncredited)
Murray Kash
— Proprietor of Taxi Bar (uncredited)
Charles Lloyd Pack
— Sir Walter Blixon (uncredited)
Guido Lorraine
— Room Waiter (uncredited)
André Maranne
— Bar Waiter (uncredited)
Andre Mikhelson
— Head Waiter (uncredited)
John Moffatt
— Barman (uncredited)
Bill Morgan
— Croupier (uncredited)
Orest Orloff
— Casino Barman (uncredited)
Hal Osmond
— Liftman (uncredited)