- Country: USA
- Genres: Drama
- Release: 1965-03-12
- Director: Gordon Douglas
- Writers: Sydney Boehm , Howard Fast
- Language: English | French | Spanish
- Stars: Carroll Baker , George Maharis , Joanne Dru (1922–1996) , Peter Lawford , Viveca Lindfors , Edmond O’Brien , Aldo Ray , Ann Sothern , Ann Sothern , Lloyd Bochner , Paul Gilbert
- Runtime: 115 min
- Awards: N/A
- AKA: Sylvia (Finland) , Sylvia (United States of America) , Sylvia (United Kingdom) , Sylvia , Das Vorleben der Sylvia West (Austria) , Η γυναίκα του πεζοδρομίου (Greece) , Sylvia (Austria) , Sylvia , Vem var Sylvia? (Sweden) , I gynaika tou pezodromiou (Greece) , Silvia (Spain) , Silvia (Brazil) , La doppia vita di Sylvia West (Italy) , Das Vorleben der Sylvia West , L'enquête (France, French Republic)
- Plot: Sylvia West is a young poetess engaged to Frederic Summers, an eccentric millionaire. Summers, a man who always fears he is being loved for his money, decides to make a small check on his prospective bride. The results of this check completely shock him. Not one fact matches 'his' Sylvia. Intregued and bewildered, Summers hires detective Alan Maklin and has him make a thorough investigation on 'Who Is Sylvia.'
- IMDB:tt0059773
Sylvia Cast · · · ALL
Gordon Douglas
Director
Carroll Baker
Sylvia: West (Karoki, Kay, Carlyle)
George Maharis
Alan Macklin
Joanne Dru
(1922–1996)
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
(II)
(1924–2002)
Mrs. Karoki
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
(1900–1989)
Calligraphy Professor (uncredited)
John Harmon
Sid (uncredited)
Stacy Harris
Mr. Leland (uncredited)
Kathleen Mulqueen
Assistant Principal (uncredited)