 | Marcello Mastroianni als Marcello Rubini |
 | Anita Ekberg als Sylvia |
 | Anouk Aimée als Maddalena |
 | Yvonne Furneaux als Emma |
 | Magali Noël als Fanny |
 | Alain Cuny als Steiner |
 | Annibale Ninchi als Marcello's father |
 | Walter Santesso als Paparazzo |
 | Valeria Ciangottini als Paola |
 | Riccardo Garrone als Riccardo |
 | Ida Galli als Debutante of the year |
 | Audrey McDonald als Jane |
 | Polidor als Pagliaccio |
 | Alain Dijon als Frankie Stout |
 | Mino Doro als Lover of Nadia |
 | Giulio Girola als Police commissioner |
 | Laura Betti als Laura |
 | Nico als Nico |
| Domino |
| Carlo Musto als Transvestite |
 | Enzo Cerusico als Photographer |
 | Giulio Paradisi als Photographer |
 | Enzo Doria als Photographer |
 | Enrico Glori als Admirer of Nadia |
 | Adriana Moneta als Ninni |
| Massimo Busetti als Miracle child |
 | Lex Barker als Robert - Sylvia's husband |
 | Jacques Sernas als The star |
 | Nadia Gray als Nadia |
 | Giuseppe Addobbati als (uncredited) |
| Conte Brunoro Serego Aligheri als Young Man with Mink Coat (uncredited) |
 | Gabriella Andreini als Woman at Nadia's Party (uncredited) |
| Federika André als Tenant in Steiner's House (uncredited) |
| Armando Annuale als (uncredited) |
| Joan Antequera als Woman at Castle (uncredited) |
| Juan Antequero als Spanish Gentleman with Eyepatch at Castle (uncredited) |
| Gianni Baghino als (uncredited) |
 | Nadia Balabine als Reporter (uncredited) |
 | Ignazio Balsamo als (uncredited) |
| Remo Benedetti als (uncredited) |
| Andrea Bianchi als Man at Nadia's Party (uncredited) |
 | Lars Bloch als Party Guest (uncredited) |
| Leonardo Botta als Doctor (uncredited) |
| Ida Bracci Dorati als (uncredited) |
| Ferdinando Brofferio als Maddalena's Lover (uncredited) |
| Giovanna Busetti als Lying Child of The Miracle (uncredited) |
| Tito Buzzo als Muscle Man (uncredited) |
| Daniela Calvino als Daniela (uncredited) |
| Tony Campanino als Man at Nightclub (uncredited) |
 | Fabrizio Capucci als Photographer at Press Conference (uncredited) |
 | Donato Castellaneta als Reporter (uncredited) |
 | Adriano Celentano als Self (uncredited) |
| Elisabetta Cini als Sleeping Duchess (uncredited) |
| Giulio Citti als Man at Nightclub (uncredited) |
 | Leo Coleman als Negro Dancer (uncredited) |
| Nani Colombo als Woman at the Mirror (uncredited) |
| Mario Conocchia als Lawyer with Nadia's Bra (uncredited) |
| Francesco Consalvo als Scalise's Assistant (uncredited) |
| Tiziano Cortini als Movie News Cameraman (uncredited) |
| Decimo Cristiani als Young Man That Doesn't Talk (uncredited) |
| Mario De Grenet als Man at Castle That Dislikes Dog's Smell (uncredited) |
| Andrea De Pino als (uncredited) |
| Adele De Rossi als (uncredited) |
 | Donatella Della Nora als Reporter (uncredited) |
| Christine Denise als Woman Eating a Chicken (uncredited) |
| Katherine Denise als (uncredited) |
| Carlo Di Maggio als Toto Scalise (uncredited) |
| François Dieudonné als Reporter (uncredited) |
| Venceslao Dobrzensky als Giovanni (uncredited) |
| Donatella Esparmer als Lady with the Irritated Man (uncredited) |
| Paolo Fadda als Assistant Police Inspector (uncredited) |
| Umberto Felici als Reporter (uncredited) |
 | Oretta Fiume als Lisa (uncredited) |
 | Rina Franchetti als Mother of the Miracle Children (uncredited) |
| Giacomo Gabrielli als Maddalena's Father (uncredited) |
 | Franco Giacobini als Journalist at the Telephone (uncredited) |
| Angela Giavalisco als Woman at Airport (uncredited) |
| Romolo Giordani als Man at Castle (uncredited) |
| Christine Graefeck als (uncredited) |
| Lily Granado als Lucy (uncredited) |
| Libero Grandi als (uncredited) |
| Maurizio Guelfi als Reporter (uncredited) |
| Gloria Hendy als Woman in Via Veneto (uncredited) |
| April Hennessy als Woman in Via Veneto (uncredited) |
| Nina Hohenlohe als Woman at Castle (uncredited) |
| Antonio Jacono als Transvestite (uncredited) |
| Gloria Jones als Gloria (uncredited) |
| Carlo Kechler als Man with Clock (uncredited) |
| Else Knorr als (uncredited) |
| Paolo Labia als Servant in Maddalena's Household (uncredited) |
| John Francis Lane als Reporter (uncredited) |
| Sondra Lee als Ballerina in Spoleto (uncredited) |
| Marianne Leibl als Yvonne's Companion in Miracle Sequence (uncredited) |
| Guglielmo Leoncini als Scalise's Secretary (uncredited) |
 | Giuliana Lojodice als Servant at Steiner's House (uncredited) |
| Renée Longarini als Miss Steiner (uncredited) |
| Francisco Lori als Man in Miracle Sequence (uncredited) |
| Francesco Luzi als Radioreporter (uncredited) |
| Mario Mallarno als Reporter (uncredited) |
| Renato Mambor als A Tall Young Man (uncredited) |
| Vittorio Manfrino als Tabarin Director (uncredited) |
| Maria Marigliano als Massamilla (uncredited) |
| Carlo Mariotti als Male Nurse (uncredited) |
| Gino Marturano als Pimp (uncredited) |
| Maria Mazzanti als Woman at Airport (uncredited) |
 | Harriet Medin als Sylvia's Secretary (uncredited) |
| Marta Melocco als (uncredited) |
| Nello Meniconi als Man on Via Veneto (uncredited) |
| Alex Messoyedoff als Priest at the Miracle Site (uncredited) |
| Gianfranco Mingozzi als Priest That Lets Steiner Play Organ (uncredited) |
| Lucia Modigliani als (uncredited) |
| Maite Morand als Reporter (uncredited) |
| Aurelio Nardi als Uncle of Lying Children of The Miracle (uncredited) |
| Desmond O'Grady als Steiner's Guest (uncredited) |
 | Liana Orfei als (uncredited) |
 | Umberto Orsini als Man in Sunglasses That Helps Nadia Strip (uncredited) |
| Contessa Cristina Paolozzi als Laughing Girl at Seance (uncredited) |
 | Ada Passeri als Woman in Miracle Sequence (uncredited) |
 | Franca Pasut als Girl Covered with Feathers (uncredited) |
| Loretta Pepi als (uncredited) |
 | Paola Petrini als (uncredited) |
 | Cesarino Miceli Picardi als Irate Man in Nightclub (uncredited) |
| Princess Doris Pignatelli als Lady in White Coat at Castle (uncredited) |
 | Alberto Plebani als Doctor (uncredited) |
| Oliviero Prunas als Oliviero - Son of Prince (uncredited) |
| Giovanni Querrel als Man at Nightclub (uncredited) |
 | Giulio Questi als Don Giulio (uncredited) |
| Concetta Ragusa als Reporter (uncredited) |
| Loretta Ramaciotti als Woman in Seance (uncredited) |
 | Leonida Repaci als Steiner's Guest (uncredited) |
 | Alfredo Rizzo als Television Director (uncredited) |
| Rosemary Rennel Rodd als English Medium (uncredited) |
| Giancarlo Romani als Policeman (uncredited) |
 | Franco Rossellini als The Beautiful Horseman (uncredited) |
| Prince Eugenio Ruspoli di Poggio Suasa als Don Eugenio Mascalchi (uncredited) |
| Margherita Russo als Steiner's Guest (uncredited) |
| Anna Maria Salerno als Prostitute's Friend (uncredited) |
| Anna Salvatore als Steiner's Guest (uncredited) |
 | Archie Savage als Negro Dancer (uncredited) |
| Lisa Schneider als Woman in Miracle Sequence (uncredited) |
| Maria Pia Serafini als Second Lady with the Irritated Man (uncredited) |
| Noel Sheldon als Man in Via Veneto (uncredited) |
| Isabella Soldani als (uncredited) |
| Letizia Spadini als Steiner's Guest (uncredited) |
 | Giò Stajano als Pierone (uncredited) |
| Gino Talamo als (uncredited) |
| Sandra Tesi als Young Girl Living Nearby (uncredited) |
| Henry Thody als Reporter (uncredited) |
| Tomás Torres als Gianelli (uncredited) |
| Iris Tree als Poetess at Steiner's Party (uncredited) |
| Vando Tress als Police Inspector (uncredited) |
 | Gondrano Trucchi als Servant at Caracalla's (uncredited) |
| Teresa Tsao als Woman in Nightclub (uncredited) |
| Winie Vagliani als The Lady Who sings at Steiner's (uncredited) |
| Leontine Van Strein als Matinee Idol's Girl Friend (uncredited) |
 | Aldo Vasco als Man in Miracle Sequence (uncredited) |
| Lucia Vasilicò als Young Woman Making Confession at Nadia's Party (uncredited) |
 | Maria Teresa Vianello als Woman at Airport (uncredited) |
| Sandy von Normand als Interpreter at the Press Conference (uncredited) |
| Antoinette Weynen als (uncredited) |
| Angela Wilson als Woman in Via Veneto (uncredited) |
| Vadim Wolkonsky als Prince Mascalchi (uncredited) |
| Maria Teresa Wolodimeroff als The Bored Lady (uncredited) |
| Gianni Zamputo als Man at Nadia's Party (uncredited) |
 | Italo Zingarelli als Don Giulio (uncredited) |
| Iolanda Fortini als (uncredited) |
 | Marta Timar als (uncredited) |
 | Bruna Cealti als (uncredited) |
 | Nancy Lecchini als Party Guest (uncredited) |
 | Giulio Tomei als Night Club Customer (uncredited) |
 | Lucia Cavalieri als Old Woman by the Miracle Tree (uncredited) |
| Rio Nobile als Nightclub Customer (uncredited) |
| Edward Febo Kelleng als Party Guest (uncredited) |
| Nino Rota | Original Music Composer |
| Otello Martelli | Director of Photography |
| Leo Catozzo | Editor |
| Federico Fellini | Director |
| Federico Fellini | Story |
| Ennio Flaiano | Story |
| Tullio Pinelli | Story |
| Federico Fellini | Screenplay |
| Ennio Flaiano | Screenplay |
| Tullio Pinelli | Screenplay |
| Giuseppe Amato | Producer |
| Franco Magli | Executive Producer |
| Angelo Rizzoli | Producer |
| Piero Gherardi | Costume Designer |
| Sergio Angeloni | Assistant Makeup Artist |
| Otello Fava | Makeup Artist |
| Renata Magnanti | Hairstylist |
| Nello Meniconi | Production Manager |
| Manlio Morelli | Production Manager |
| Gianfranco Mingozzi | Second Assistant Director |
| Lili Rademakers | Second Assistant Director |
| Giancarlo Romani | Second Assistant Director |
| Vito Anzalone | Assistant Production Design |
| Giorgio Giovannini | Assistant Production Design |
| Lucia Mirisola | Assistant Production Design |
| Ennio Guarnieri | Assistant Camera |
| Arturo Zavattini | Camera Operator |
| Adriana Olasio | Assistant Editor |
| Vanda Olasio | Assistant Editor |
| Franco Ferrara | Conductor |
| Armando Trovajoli | Music Arranger |
| Mario Basili | Production Secretary |
| Osvaldo De Micheli | Production Secretary |
| Mario Di Biase | Production Secretary |
| Piero Gherardi | Production Design |
| Guidarino Guidi | First Assistant Director |
| Paolo Nuzzi | First Assistant Director |
| Dominique Delouche | First Assistant Director |
| Isa Mari | Script Supervisor |
| Agostino Moretti | Sound |
| Oscar Di Santo | Sound |
| Clemente Fracassi | Line Producer |
| Alessandro von Norman | Unit Manager |
| Brunello Rondi | Screenplay |
| Pier Paolo Pasolini | Screenplay |
