David Niven as Rex Allerton

Peggy Cummins as Sally

Anne Vernon as Jane

Herbert Lom as André Amico

Charles Victor as Jennings

Gordon Jackson as Ralph

Felix Aylmer as Winant

Hugh McDermott as Rodney Wheeler

Stanley Maxted as Oliver Stanton

June Clyde as Viola

John Chandos as Gulliver Kee

Theodore Bikel as Parsimonious

Sebastian Cabot as Suarez

Eugene Deckers as Vernet

Andreas Malandrinos as Fodor (as Andrea Malandrinos)

Nicholas Stuart as American Radio Announcer

Michael Ward as A Hotel Receptionist

Helena Pickard as Sally's Mother

Marcel Poncin as Priest

Alexis Chesnakov as The Russian Man

Nelly Arno as The Russian Woman

Gabrielle Blunt as Doreen

Mark Baker as Maxie

Boscoe Holder as A Witch Doctor

John Glyn-Jones as Prince Boris

Michael Alexander as Minor Role (uncredited)

Humphrey Bogart as Self (uncredited)

Michael Craig as Cameraman Assistant (uncredited)

Betty Henderson as Bit Part (uncredited)

Hattie Jacques as Chambermaid (uncredited)

Alvar Liddell as Self (uncredited)

Jean Marsh as Dancer in Sally's Dream (uncredited)

Dido Plumb as Man in Audience (uncredited)