Vittorio Gassman as Mario

Ugo Tognazzi as Amedeo

Jean-Louis Trintignant as Enrico

Marcello Mastroianni as Luigi

Stefania Sandrelli as Giovanna

Carla Gravina as Carla

Ombretta Colli as Enza

Galeazzo Benti as Galeazzo

Milena Vukotić as Emanuela

Stefano Satta Flores as Tizzo

Serge Reggiani as Sergio

Agenore Incrocci as Vittorio

Leonardo Benvenuti as Un ospite

Ugo Gregoretti as Un ospite

Lucio Lombardo Radice as se stesso

Francesco Maselli as se stesso

Mino Monicelli as il presidente della RAI

Claudio Sestieri as

Lucio Villari as il padrone di casa

Helena Ronee as La padrona di casa

Marie Trintignant as Isabella

Venantino Venantini as un'ospite

Ritza Brown as

Olimpia Carlisi as un'ospite

Simonetta Del Frate as Ada

Graziella Galvani as Scrittrice

Fabio Garriba as Giorgio Campi

Margherita Horowitz as un'ospite

Elisa Mainardi as

Maurizio Micheli as Bruno

Remo Remotti as un ospite

Fausto Schermi as

Marie Claire Solleville as

Gheorghieva Danon Zora as

Amerigo Alberani as Roberto

Elena Fabrizi as la portinaia

Carlo Cataneo as Professor Pomarango

Giuseppe Marrocco as

Angiolina Quinterno as Nicoletta

Irina Sanpiter as Hostess

Rossana Canghiari as Woman in TV (uncredited)