Yves Montand as L'inspecteur Grazzi

Pierre Mondy as Le commissaire Tarquin

Jean-Louis Trintignant as Éric Grandin, étudiant vétérinaire

Jacques Perrin as Daniel

Catherine Allégret as Bambi

Simone Signoret as Eliane Darès, l'actrice éventée (Victime #4)

Claude Mann as Jean-Loup Gabert, inspecteur stagière de Grazzi

Michel Piccoli as René Cabourg, l'employé besogneux (Victime #2)

Pascale Roberts as Georgette Thomas, assassinée (Victime #1)

Charles Denner as Bob, l'amant sincère de Georgette Thomas

Nadine Alari as Mme Grazzi

Monique Chaumette as Mme Rivolani

Paul Pavel as M. Rivolani

Christian Marin as Le beau-frère de Georgette, mari soumis

Tanya Lopert as Mme Garaudy

Jenny Orléans as La sœur de René Cabourg

Serge Rousseau as Le contrôleur du train phocéen de nuit

Bernadette Lafont as La sœur "mauvaise langue" de Georgette

Maurice Chevit as Un inspecteur, sous les ordres de Tarquin

Jacques Dynam as Un inspecteur, sous les ordres de Tarquin

Paul Pavel as Passager du compartiement (Victime #3)

Philippe Rouleau as L'inspecteur Antoine

André Valmy as Un inspecteur, sous les ordres de Tarquin

Daniel Gélin as Le vétérinaire titulaire, chargé de cours (uncredited)

Françoise Arnoul as Une infirmière à l'école vétérinaire (uncredited)

Dominique Zardi as Un inspecteur au bistrot (uncredited)

Claude Berri as Un porteur à la gare de Lyon (uncredited)

Marcel Bozzuffi as Un agent de police (uncredited)

Nicole Desailly as La concierge d'Eliane (uncredited)

Denise Péron as Une pocharde (uncredited)

Claude Dauphin as Le frère d'Eliane (uncredited)

Edmond Ardisson as Le policier marseillais (voice) (uncredited)

José Artur as Un journaliste (uncredited)

Maurice Auzel as Un inspecteur au café (uncredited)

Dominique Bernard as Un employé de la SNCF (uncredited)

Lucien Desagneaux as L'homme qui embrasse une femme à la brasserie (uncredited)

Jean Droze as Une personne auditionnée dans les locaux de la Police Judiciaire (uncredited)

Charles Gérard as Un travesti près du kiosque à journaux (uncredited)

Georges Géret as Un agent de police (uncredited)

Clément Harari as Une "femme" au bistrot (uncredited)

Jean Lefebvre as (uncredited)

Serge Marquand as Un amant de Georgette (uncredited)

Albert Michel as Le patron du bistrot (uncredited)

Charles Millot as Le médecin légiste (uncredited)

Paul Bernard as (uncredited)

Jean-Pierre Périer-Pillu as (uncredited)

Robert Sabatier as (uncredited)

William Sabatier as Le commissaire Tuffi (uncredited)

Jacqueline Staup as La supérieure hiérarchique de Bambi (uncredited)

Josée Steiner as L'employée de l'hôtel Arizona (uncredited)

Lionel Vitrant as Un inspecteur (uncredited)

André Weber as Le poivrot arrêté, dans les locaux de la Police Judiciaire (uncredited)