Alain Delon as Mr. Robert Klein

Jeanne Moreau as Florence Klein

Francine Bergé as Nicole

Juliet Berto as Jeanine

Jean Bouise as Seller

Suzanne Flon as Doorwoman

Massimo Girotti as Charles

Michael Lonsdale as Pierre

Michel Aumont as Jew Affairs Section Official

Roland Bertin as Newspaper Director

Jean Champion as Diener

Etienne Chicot as Policeman

Magali Clément as Lola

Gérard Jugnot as Photographer

Hermine Karagheuz as Young Worker

Jacques Maury as Professor Montandon

Fred Personne as Police Commissioner

Francine Racette as Françoise / Cathy / Isabelle

Isabelle Sadoyan as Examined Woman

Louis Seigner as Mr. Klein's Father

Elisabeth Kaza as

Carole Achache as

Lucienne Le Marchand as

Rosine Rochette as

Maurice Vallier as

Pierre Vernier as Policeman

François Viaur as

Joseph Losey as Un Homme au Vel d'Hiv (uncredited)

Brigitte Ariel as (uncredited)

Marius Balbinot as (uncredited)

Maurice Baquet as Un Musicien (uncredited)

Philippe Brizard as (uncredited)

Jenny Clève as (uncredited)

Raymond Danon as (uncredited)

Christian de Tillière as Le Commissaire-Priseur (uncredited)

Michel Delahaye as (uncredited)

Bernard-Pierre Donnadieu as Extra (uncredited)

Pierre Frag as Le Marchand de Journaux (uncredited)

Mireille Franchino as (uncredited)

David Gabison as Le Groom (uncredited)

Maurice Jany as Le Chauffeur à Ivry-Bataille (uncredited)

Stephane Quatrehomme as Le Fils de Pierre (uncredited)

Jean Topart as La Voix du Speaker (voice) (uncredited)

Danielle Verne as Une Déportée (uncredited)

Dany Kogan as Michelle

Thierry de Brem as