That Most Important Thing: Love

Romy Schneider

Nadine Chevalier

Fabio Testi

Servais Mont

Jacques Dutronc

Jacques Chevalier

Claude Dauphin

Mazelli

Roger Blin

Servais' Father

Nicoletta Machiavelli

Luce Lapade

Klaus Kinski

Karl-Heinz Zimmer

Gabrielle Doulcet

Madame Mazelli

Michel Robin

Raymond Lapade

Guy Mairesse

Laurent Messala

Katia Tchenko

Myriam, the prostitute

Paul Bisciglia

The Assistant Director

Sylvain Lévignac

The First Man in the Brewery

Olga Valéry

The Woman with the Dildo

Jacques Boudet

Robert Beninge

Robert Dadiès

The Doctor in the Hospital / An Actor in the Theatre

Georges-Fréderic Dehlen

An Actor in the Theatre

Jack Jourdain

Victor

Claude Legros

Manuel Rosenthal

Kira Potonie

Messala's wife

Michel Such

The Electrician

Jacques Van Dooren

Verdurin

Nadia Vasil

The Female Director

Sin May Zao

The Vietnamese Girl

Gérard Zimmermann

Léonard

Claudine Beccarie

The Girl at the Orgy (uncredited)

Frédérique Barral

Girl in the brewery (uncredited)

Michel Berreur

The second man in the brewery (uncredited)

Guy Delorme

Mazelli henchman (uncredited)

Jerry Di Giacomo

The transvestite English (uncredited)

Serge Godenaire

The youth in the orgy (uncredited)

Gérard Moisan

Mazelli henchman (uncredited)

Manu Pluton

The man at the gym (uncredited)

Eric Vasberg

The third man in the brewery (uncredited)