- Ray Milland as Tony Wendice
- Grace Kelly as Margot Mary Wendice
- Robert Cummings as Mark Halliday
- John Williams as Chief Inspector Hubbard
- Anthony Dawson as Charles Alexander Swann/Captain Lesgate
- Leo Britt as storyteller at the party
- Patrick Allen as Detective Pearson
- Robin Hughes as Police Sergeant
- Martin Milner as policeman outside Wendice flat (uncredited)
- George Leigh as Detective Williams
- George Alderson as First Detective
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