Marlon Brando as Freddy Benson

David Niven as Lawrence Jameson

Shirley Jones as Janet Walker

Dody Goodman as Fanny Eubank

Aram Stephan as Andre

Parley Baer as Col. Williams

Marie Windsor as Mrs. Sutton

Rebecca Sand as Miss Trumble

Francine York as Gina

Susanne Cramer as Anna

Danica D'Hondt as Mrs. Knudson (uncredited)

Barbara Bouchet as German Girl (uncredited)

Albert Carrier as Assistant Manager (uncredited)

Eddie Ness as Tuttle (uncredited)

Rolfe Sedan as Waiter (uncredited)

Bernard Sell as Casino Patron (uncredited)

Stephen Soldi as Casino Patron (uncredited)

John Banner as Burgermeister (uncredited)

Bess Flowers as Extra (uncredited)

Jean Del Val as Croupier (uncredited)

Françoise Ruggieri as Party Girl (uncredited)