Sylvia

Carroll Baker

Sylvia: West (Karoki, Kay, Carlyle)

George Maharis

Alan Macklin

Joanne Dru

Jane (Bronson) Phillips

Peter Lawford

Frederic Summers

Viveca Lindfors

Irma Olanski

Edmond O'Brien

Oscar Stewart

Aldo Ray

Jonas Karoki

Ann Sothern

Mrs. Argona / Grace Argona

Lloyd Bochner

Bruce Stamford III

Paul Gilbert

Lola Diamond

Jay Novello

Father Gonzales

Nancy Kovack

Big Shirley

Gene Lyons

Gavin Cullen

Anthony Caruso

Wilbur (aka "Muscles")

Alan Carney

Gus

Shirley O'Hara

Mrs. Karoki

Ricky Allen

Herbert, the Boy in the Library (uncredited)

Val Avery

Pudgey Smith (uncredited)

Majel Barrett

Anne (uncredited)

Jean Del Val

Maitre'd (uncredited)

Connie Gilchrist

Molly Banter (uncredited)

Gavin Gordon

Butler (uncredited)

Clive Halliday

Calligraphy Professor (uncredited)

John Harmon

Sid (uncredited)

Stacy Harris

Mr. Leland (uncredited)

Kathleen Mulqueen

Assistant Principal (uncredited)

Manuel Padilla Jr.

Pancho Guzman (uncredited)

Robert Random

(uncredited)

Gene Roth

Professor Eglebert (uncredited)

Geraldine Wall

Clerk at Private Hospital (uncredited)

Paul Wexler

Peter Memel (uncredited)