| Romy Schneider | ... | Nadine Chevalier | |
| Fabio Testi | ... | Servais Mont | |
| Jacques Dutronc | ... | Jacques Chevalier | |
| Claude Dauphin | ... | Mazelli | |
| Roger Blin | ... | Le père de Servais / Servais's father | |
| Gabrielle Doulcet | ... | Madame Mazelli | |
| Michel Robin | ... | Raymond Lapade | |
| Guy Mairesse | ... | Laurent Messala | |
| Katia Tchenko | ... | Myriam, la putain | |
| Nicoletta Machiavelli | ... | Luce, la femme de Lapade | |
| Klaus Kinski | ... | Karl-Heinz Zimmer | |
| Paul Bisciglia | ... | L'assistant-metteur en scène | |
| Henri Coutet | ... | Le père de Jacques (scenes deleted) | |
| Sylvain Levignac | ... | Le premier homme dans la brasserie (as Sylvain) | |
| Andrée Tainsy | ... | La mère de Jacques (scenes deleted) | |
| Olga Valéry | ... | La femme au godemiché | |
| Jacques Boudet | ... | Robert Beninge | |
| Robert Dadiès | ... | Le médecin à l'hôpital / Un acteur au théâtre | |
| Georges-Fréderic Dehlen | ... | Un acteur au théâtre (as Georges F. Dehlen) | |
| Jack Jourdan | ... | Victor (as Jacques Jourdan) | |
| Claude Legros | ... | Manuel Rosenthal | |
| Maritin | ... | Le frère de Jacques (scenes deleted) | |
| Kira Potonie | ... | La femme de Messala | |
| Michel Such | ... | L'électricien | |
| Jacques Van Dooren | ... | Verdurin | |
| Nadia Vasil | ... | La réalisatrice | |
| Sin May Zao | ... | La vietnamienne | |
| Gérard Zimmermann | ... | Léonard | |
| rest of cast listed alphabetically: | |||
| Philippe Clévenot | ... | (scenes deleted) | |
| Sybil Danning | ... | (scenes deleted) | |
| Marc Dudicourt | ... | (scenes deleted) | |
| Zouzou | ... | (scenes deleted) | |
| Frédérique Barral | ... | Une fille dans la brasserie (uncredited) | |
| Claudine Beccarie | ... | La fille dans la partouze (uncredited) | |
| Michel Berreur | ... | Le second homme dans la brasserie (uncredited) | |
| Guy Delorme | ... | Un homme de main de Mazelli (uncredited) | |
| Jerry Di Giacomo | ... | L'anglais en travesti (uncredited) | |
| Michel Duchaussoy | ... | Karl-Heinz Zimmer (voice) (uncredited) | |
| Josep Maria Flotats | ... | Servais Mont (voice) (uncredited) | |
| Serge Godenaire | ... | L'éphèbe dans la partouze (uncredited) | |
| Gérard Moisan | ... | Un autre homme de main de Mazelli (uncredited) | |
| Manu Pluton | ... | L'homme au gymnase (uncredited) | |
| Martine Sarcey | ... | Luce (voice) (uncredited) | |
| Eric Vasberg | ... | Le troisième homme dans la brasserie (uncredited) | |
| Howard Vernon | ... | (voice) (uncredited) | |
Directed by | |||
| Andrzej Zulawski | |||
Writing credits | ||
| Christopher Frank | (novel "La nuit americaine") | |
| Christopher Frank | (adaptation) & | |
| Andrzej Zulawski | (adaptation) | |
| Christopher Frank | (dialogue) | |
Produced by | |||
| Albina du Boisrouvray | .... | producer | |
| Léo L. Fuchs | .... | associate producer | |
Original Music by | |||
| Georges Delerue | |||
Cinematography by | |||
| Ricardo Aronovich | |||
Film Editing by | |||
| Christiane Lack | |||
Production Design by | |||
| Jean-Pierre Kohut-Svelko | |||
Costume Design by | |||
| Catherine Leterrier | |||
Makeup Department | |||
| Massimo De Rossi | .... | assistant makeup artist | |
| Jean-Pierre Guérin | .... | hair stylist | |
| Didier Lavergne | .... | makeup artist (as Daniel Lavergne) | |
Production Management | |||
| Alain Artur | .... | assistant unit manager | |
| Georges Casati | .... | production manager | |
| Daniel Deschamps | .... | unit manager | |
| Roland Godard | .... | assistant unit manager | |
Second Unit Director or Assistant Director | |||
| Laurent Ferrier | .... | assistant director | |
| Philippe Lopez | .... | third assistant director | |
| Franco Sormani | .... | second assistant director | |
Art Department | |||
| Pierre Roudeix | .... | props | |
| Jean-Claude Sévenet | .... | property master | |
Sound Department | |||
| Daniel Couteau | .... | sound effects editor | |
| Jacques Gérardot | .... | sound recordist | |
| Maurice Laumain | .... | sound editor | |
| Jean Nény | .... | sound mixer | |
Editorial Department | |||
| Genevieve Sebestik | .... | assistant editor | |
| Marie-Claude von Dorpp | .... | assistant editor | |
Other crew | |||
| Claude Carliez | .... | fighting coordinator | |
| Georges Martin-Cocher | .... | administrator | |
| Élisabeth Rappeneau | .... | script girl | |
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| Fellini Satyricon | Original Sin | The Black Dahlia | Inland Empire | La fidélité |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Drama section | IMDb France section |
Romy Schneider was absolutely right to consider this film as her major professional achievement. Thanks to Christopher Franck's remarkable adaptation from his own awarded novel LA NUIT AMERICAINE (not to be mistaken with Truffaut's well-known DAY FOR NIGHT) and to Georges Delerue's haunting soundtrack, Zulawski is here at his paramount, because his usual romantic excesses perfectly fit this time the subject. As for the cast, all the actors have never been so right in the part they've been chosen for : from Fabio Testi to Jacques Dutronc, from Klaus Kinsky to Claude Dauphin, not to mention Michel Robin. The scene in the bar, just after the theatrical premiere of Shakespeare's RICHARD III, when the whole crew reads the articles dedicated to their play, almost looks like a mirror of Zulawski himself, as most of his works have been misunderstood, if not definitely "killed" by the critics. if you happen to belong to the happy few who sincerely praise L'IMPORTANT C'EST D'AIMER, try to see some day the films that writer Christopher Franck personally directed from other novels of his about the same bohemian milieu, specially JOSEPHA, featuring Miou Miou & Claude Brasseur.