Patrick O'Neal as Richard Cutting

Joan Hackett as Dominique Laurant

John Gielgud as Curt Valayan

Herbert Lom as Matt Wilson

Eric Portman as Notary

Peter van Eyck as Walter Green

Oskar Homolka as Inspector Ruff

Leon Greene as The Big Man

Kent Smith as Mr. Eversley

Philip Ober as Bohlen

Fifi D'Orsay as Mrs. Hennie

Éva Szörényi as Landlady (as Eva Soreny)

Cynthia O'Neal as Felice Valayan (as Cynthia Baxter)

Martin Miller as Police Chief (uncredited)

Charles H. Radilak as Manager (uncredited)

Erik Sorenson as Bellboy (uncredited)

Betty Bresler as Secretary (uncredited)

Joanne Ludden as Receptionist (uncredited)

Walter Friedel as Secretary (uncredited)

Karl Bruck as Waiter (uncredited)

Walter Janovitz as Waiter (uncredited)

Albert D'Arno as Waiter (uncredited)

Ann Prentiss as Hotel Party Girl in Red Dress (uncredited)