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)

Joseph Ruttenberg

Paul K. Lerpae

Howard Beals

David Raksin

Van Cleave

Paul Anka

Edward B. Powell

Harry Lindgren

Sound recordist

John Wilkinson

Sound recordist

Nellie Manley

Wally Westmore

Edith Head

Costume design

Joan Joseff

Overig

Hal Pereira

Art direction

Roland Anderson

Art direction

Sam Comer

Set decoration

Arthur Krams

Set decoration

Frank Bracht

Editor

Steve Shagan

Associate producer

Shirley Mellner

Associate producer

Martin Poll

Producent

Dick Moder

Gordon Douglas

Regisseur

Howard Fast

Sydney Boehm

Farciot Edouart