Patrick Dewaere as Paul Kerjean

Michel Auclair as Michel Saint-Claude, director of GTI-Europe

Caroline Cellier as Hélène Kerjean

Charles Denner as Walter, private detective

Anny Duperey as Laura Weber, JBL's mistress

Jeanne Moreau as Madame Benoît-Lambert

Mel Ferrer as Cornelius A. Woaegen, president of GTI

Jean-Laurent Cochet as Serge Hartmann, director of La Tribune

Fernand Ledoux as Mr. Guérande

André Falcon as Pierre Bayen, editor-in-chief

Claude Vernier as Dr. Gerhard Kramer

Édith Scob as Madame Bronsky

Jacques François as Fred Great

Robert Party as Jacques Benoît-Lambert, aka 'JBL'

Jean-Pierre Kalfon as Bronsky, then Stan Hankins, the informant

Jean Mercure as Joachim Holstein, Director of GTI-Austria

Claude Marcault as Kerjean's secretary

Jacques Maury as Jack Sleiter, director of GTI

Jacqueline Doyen as Arlène Robert

Marc Eyraud as Sylvestre

Jean Claudio as Vittorio Orta, Director of GTI-Italy

Anthony Stuart as Accuser

Hans Verner as Kurt von Schroeder

Edward Marcus as GTI controller

Pierre Londiche as French interpreter in court

Camille Clavel as Bastien Kerjean

Edmond Bernard as Ralph von Lübeck

Frédérique Meininger as Concierge

François Viaur as Hotel receptionist

Marie-Pierre Casey as Madame Benoît-Lambert's maid

Jacques David as Police commissioner

Marc Fayolle as Enthusiastic reader

Yaseen Khan as Suta Burishawa

Roger Comte as Waiter at the brasserie

Marie-Christine Rolland as Secretary of the Walter agency

Yvonne Dany as Germaine Guérande (uncredited)

Rachid Ferrache as Éric Bronsky (uncredited)

Sacha Lavin as Madame Bayen (uncredited)

Fabienne Mai as Madame Holstein (uncredited)

Bernard Tachl as The follower (uncredited)