Paul Newman as Andrew Craig

Edward G. Robinson as Max Stratman/Walter Stratman

Elke Sommer as Inger Lisa Andersson

Diane Baker as Emily Stratman

Micheline Presle as Denise Marceau

Gérard Oury as Claude Marceau

Sergio Fantoni as Carlo Farelli

Kevin McCarthy as John Garrett

Leo G. Carroll as Bertil Jacobsson

Sacha Pitoëff as Dranyi

Jacqueline Beer as Monique Souvir

John Wengraf as Hans Eckhart

Don Dubbins as Ivar Cramer, Light Henchman

Virginia Christine as Mrs. Bergh, Chaperon

Rudolph Anders as Mr. Rolfe Bergh - Chaperon

Martine Bartlett as Saralee Garrett

Karl Swenson as Hilding

John Qualen as Oscar

Ned Wever as Clark Wilson

Bess Flowers as Lady In Audience (uncredited)

Britt Ekland as Nudist (uncredited)

Colin Kenny as Guest at Awards Ceremony (uncredited)

Bert Stevens as Guest at Award Ceremony (uncredited)

Arthur Tovey as Waiter at Reception (uncredited)

Lori Williams as Dancer (uncredited)

Sigrid Petterson as Speaker at Nudist meeting (uncredited)

Lars Passgård as Swedish man (uncredited)

Grazia Narciso as Madame Farelli (uncredited)

Annalena Lund as Blonde at Nightclub (uncredited)

George Boyce as Party Guest (uncredited)

Noel Drayton as Constable Strohm (uncredited)

Stuart Hall as Guest at Awards Ceremony (uncredited)