Mr. Klein

Alain Delon

Mr. Robert Klein

Jeanne Moreau

Florence

Francine Bergé

Nicole

Juliet Berto

Jeanine, Robert's mistress

Jean Bouise

Seller of the painting

Suzanne Flon

Concierge of rue des Abbesses

Massimo Girotti

Charles, Florence's husband

Michael Lonsdale

Pierre

Michel Aumont

Jew Affairs Section Official

Roland Bertin

Newspaper Director

Jean Champion

Morgue keeper

Etienne Chicot

Policeman

Magali Clément

Lola

Gérard Jugnot

Photographer

Hermine Karagheuz

Young Worker

Jacques Maury

Professor Montandon

Fred Personne

Police Commissioner

Francine Racette

Françoise / Cathy / Isabelle

Isabelle Sadoyan

Examined Woman

Louis Seigner

Mr. Klein's Father

Elisabeth Kaza

Carole Achache

Lucienne Le Marchand

Rosine Rochette

Maurice Vallier

Pierre Vernier

Policeman

François Viaur

Joseph Losey

Man at the Vel d'Hiv (uncredited)

Brigitte Ariel

(uncredited)

Marius Balbinot

(uncredited)

Maurice Baquet

Musician (uncredited)

Philippe Brizard

(uncredited)

Jenny Clève

(uncredited)

Raymond Danon

(uncredited)

Christian de Tillière

Auctioneer (uncredited)

Michel Delahaye

(uncredited)

Bernard-Pierre Donnadieu

Extra (uncredited)

Pierre Frag

Georges, Newspaper Seller (uncredited)

Mireille Franchino

(uncredited)

David Gabison

Bellboy (uncredited)