Ewa Aulin as Candy Christian

Charles Aznavour as Hunchback juggler

Marlon Brando as Grindl

Richard Burton as MacPhisto

James Coburn as Dr. A.B. Krankheit

John Huston as Dr. Arnold Dunlap

Walter Matthau as Gen. R.A. Smight

Ringo Starr as Emmanuel

John Astin as T.M. Christian / Jack Christian

Elsa Martinelli as Livia

Sugar Ray Robinson as Zero

Anita Pallenberg as Nurse Bullock

Lea Padovani as Silvia Fontegliulo

Florinda Bolkan as Lolita

Marilù Tolo as Marquita

Umberto Orsini as The Big Guy

Enrico Maria Salerno as Jonathan J. John

Neal Noorlag as Harold

Enzo Fiermonte as Al Pappone

Peter Dane as Luther

Peggy Nathan as Miss Quinby

Anthony Foutz as Mobster

Tom Keyes as Mobster

Mark Salvage as Dr. Harris

Micaela Pignatelli as Girl

Joey Forman as The Cop

Fabian Dean as The Sergeant

Christian Marquand as Film Director (uncredited)

Buck Henry as Mental Patient (uncredited)

Judith Malina as Woman (uncredited)

Julian Beck as Hippie (uncredited)

Romano Targa as Max (uncredited)

International Velvet as Extra