Alain Delon as Tom Ripley

Marie Laforêt as Marge Duval

Maurice Ronet as Philippe Greenleaf

Erno Crisa as Inspector Riccordi

Frank Latimore as O'Brien

Billy Kearns as Freddy Miles

Ave Ninchi as Signora Gianna

Viviane Chantel as Belgian Lady

Nerio Bernardi as Agency Director

Barbel Fanger as Mr. Greenleaf

Lily Romanelli as Housekeeper

Nicolas Petrov as Boris

Elvira Popescu as Mrs. Popova

Romy Schneider as Freddy's Companion (uncredited)

Paul Müller as Blind Man (uncredited)

René Clément as Clumsy Waiter (uncredited)

Jacqueline Parey as Ingrid (uncredited)

Leonello Zanchi as Police Inspector (uncredited)

Walter Grant as Purchaser of the Yacht (uncredited)

Nino Vingelli as (uncredited)