Audrey Hepburn as Elizabeth Roffe

Ben Gazzara as Rhys Williams

James Mason as Sir Alec Nichols

Romy Schneider as Helene Martin

Irene Papas as Simonetta Palazzi

Omar Sharif as Ivo Palazzi

Maurice Ronet as Charles Martin

Beatrice Straight as Kate Erling

Gert Fröbe as Inspector Max Hornung

Ivan Desny as Jeweller

Pinkas Braun as Dr. Wal

Michelle Phillips as Vivian Nichols

Claudia Mori as Donatella

Wolfgang Preiss as Julius Prager

Maurice Colbourne as Jon Swinton

Marcel Bozzuffi as Man in Black

Wulf Kessler as Young Sam Roffe

Guy Rolfe as Tod Michaels

Dietlinde Turban as Terenia

Walter Kohut as Krauss

Donald Symington as Henley

Charles Millot as Commissaire Bloche

Vadim Glowna as Dr. Emile Joeppli

Hans von Borsody as Peasant Guard

Derrick Branche as Chemin-de-fer Player

Josef Fröhlich as Interpol Officer

Klaus Guth as Coroner

Dan van Husen as Cameraman

Friedrich von Ledebur as Innkeeper

Leslie Sands as Doctor

Franziska Stömmer as Innkeeper

Lisa Woska as Mrs. Wal

Yves Barsacq as Bookseller

Brigitte Döllerer as 1st Murder Victim

Milda Jansen as 2nd Murder Victim

Eleonore Melzer as 3rd Murder Victim

Monika Vogl as Murder Victim

Barrie Holland as Croupier (uncredited)