Kim Novak as Lylah Clare / Elsa Brinkmann / Elsa Campbell

Peter Finch as Lewis Zarken / Louie Flack

Ernest Borgnine as Barney Sheean

Milton Selzer as Bart Langner

Rossella Falk as Rossella

Gabriele Tinti as Paolo

Valentina Cortese as Countess Bozo Bedoni

Jean Carroll as Becky Langner

Michael Murphy as Mark Peter Sheean

Coral Browne as Molly Luther

Lee Meriwether as Young Girl

Robert Ellenstein as Mike

Ellen Corby as Script Girl

George Kennedy as Matt Burke

Dick Miller as Reporter at Press Party

Al Bain as Crew Member

Tom Palmer as Press Party Guest

William Beckley as Zarkan

Jan Peters as Prop Man

Queenie Smith as Hairdresser

John Alvin as Accountant (uncredited)

Ernest Anderson as Hot Dog Man (uncredited)

Noble 'Kid' Chissell as Stagehand (uncredited)

Gene Chronopoulos as Reporter (uncredited)

Robert Cornthwaite as Studio Photo Archivist (uncredited)

Billy Curtis as Clown (uncredited)

Duke Fishman as Crew Member (uncredited)

Rex Holman as Young Man (uncredited)

John Indrisano as Studio Grip (uncredited)

Kenner G. Kemp as Brothel Patron in Film (uncredited)

James McEachin as Reporter (uncredited)

Hans Moebus as Minor Role (uncredited)

Monty O'Grady as Press Party Guest (uncredited)

Joe Ploski as German Bartender in Film (uncredited)

Cosmo Sardo as Photographer (uncredited)

Bernard Sell as Reporter (uncredited)

Max Wagner as Reporter (uncredited)

Victoria Zinny as Reporter (uncredited)