- Marcello Mastroianni as Marcello Rubini
- Anita Ekberg as Sylvia Rank
- Anouk Aimée as Maddalena
- Yvonne Furneaux as Emma
- Lex Barker as Robert
- Magali Noël as Fanny
- Alain Cuny as Steiner
- Nadia Gray as Nadia
- Jacques Sernas as Divo
- Laura Betti as Laura
- Walter Santesso as Paparazzo
- Valeria Ciangottini as Paola
- Riccardo Garrone as Riccardo
- Annibale Ninchi as Marcello's father
- Ida Galli as Debutante of the Year
- Audrey McDonald as Jane
- Alain Dijon as Frankie Stout
- Enzo Cerusico as News Photographer
- Giò Stajano as Pierone
- Giulio Questi as Don Giulio Mascalchi
- Sondra Lee as Ballerina
- Dominot as Drag Queen
- Ferdinand Guillaume as Pagliaccio
- Oretta Fiume as Lisa
- Harriet White Medin as Edna
- John Francis Lane as John
- Umberto Orsini as man in Shades
- Archie Savage as Dancer
- Nico as herself
- Adriano Celentano as himself
- Iris Tree as herself
- Winie Vagliani, singer at Steiner's party
- Desmond O'Grady, Poet, as himself
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