George Peppard

Reno Davis

Inger Stevens

Anne de Villemont

Orson Welles

Leschenhaut

Perrette Pradier

Jeanne-Marie

Keith Michell

Morillon

Geneviève Cluny

Veronique

Maxine Audley

Mathilde Rosier

Ralph Michael

Claude de Gonde

Barnaby Shaw

Paul

Jacques Roux

Maguy

Patience Collier

Goonelle

William Job

Bourdon

Ave Ninchi

Signora Orragi

Renzo Palmer

Monk

Peter Bayliss

Edmond Rosier

Francesco Mulè

Policeman at Trevi Fountain

Rosemary Dexter

Daniela

Raoul Delfosse

Louis Le Buc

James Mishler

Jesse Hardee

Jean Louis

Driot

Jean Hébey

Man in charge of sleeping cars

Jacques Stany

Georges - the family chauffeur

Paule Albert

Sophie

Calisto Calisti

Police Inspector at Rome Station (uncredited)

Andrea Esterhazy

de Villemont Party Guest (uncredited)

John Guillermin

Director

Francis Lai

Original Music Composer

Irving Ravetch

Screenplay

Cesare Gambarelli

Makeup Artist

Larry Germain

Hairstylist

Sheryl Deauville

Assistant Costume Designer

Harriet Frank Jr.

Screenplay

Giuseppe Banchelli

Makeup Artist

Vasco Reggiani

Hairstylist

Ferdinando Ruffo

Set Decoration

John McCarthy Jr.

Set Decoration

Aurelio Crugnola

Art Direction

Cesare Allione

Camera Operator

John Merrick

Casting

Alberto Pizzi

Cinematography

Giorgio Sciommer

Hairstylist

Stanley Ellin

Novel

Paola Roli

Casting

Piero Portalupi

Cinematography

Bud Westmore

Makeup Artist

J. Terry Williams

Editor

Frank Arrigo

Art Direction

Kurt Doubrowsky

Sound

Waldon O. Watson

Sound

Richard Berg

Producer

Alexander Golitzen

Art Direction

Edith Head

Costume Design