Peter Sellers
Aldo Vanucci/Federico Fabrizi
Victor Mature
Tony Powell
Britt Ekland
Gina Vanucci/Gina Romantica
Martin Balsam
Harry
Akim Tamiroff
Okra
Paolo Stoppa
Polio
Tino Buazzelli
Siepi
Mac Ronay
Carlo
Maria Grazia Buccella
Bikini Girl
Lando Buzzanca
Police Chief
Lydia Brazzi
Mamma Vanucci
Maurice Denham
Chief of Interpol
Tiberio Murgia
1st Detective
Francesco De Leone
2nd Detective
Carlo Croccolo
Cafe Owner
Nino Musco
Mayor
Pier Luigi Pizzi
Doctor
Lino Mattera
Singer
Piero Gerlini
1st Gaoler
Daniele Vargas
Prosecutor
Franco Sportelli
Judge
Giustino Durano
Critic
Mimmo Poli
Fat Actor
Enzo Fiermonte
Raymond
Angelo Spaggiari
Felix Kessler
Mario Del Vago
Manuel Ortega
Roberto De Simone
Marcel Vignon
Timothy Bateson
Michael O'Reilly (uncredited)
Ugo Carboni
Pharmacist in Sevalio (uncredited)
Angelo Casadei
Cameraman (uncredited)
Amerigo Castrighella
Via Veneto café costumer (uncredited)
Lucia Cavalieri
Bingo Player (uncredited)
Bruna Cealti
Laundress (uncredited)
Vittorio De Sica
Vittorio De Sica (uncredited)
Carlo Delle Piane
(uncredited)
Daniela Igliozzi
(uncredited)
David Lodge
Police Officer (uncredited)
Cho Cha Lung
Restaurant Patron (uncredited)
Enrico Luzi
Movie Director on Via Veneto (uncredited)
Alba Maiolini
Street Spectator (uncredited)
Maria Grazia Marescalchi
Woman in Sevalio (uncredited)
Valeria Montesi
Pharmacist's Wife (uncredited)
Peggy Nathan
Bingo Player (uncredited)
Carlo Pisacane
2nd Judge (uncredited)
Marcella Rovena
Salvatore's Wife (uncredited)
Alessandro Tedeschi
Restaurant Customer (uncredited)
Francesco Telli
Child in Sevalio (uncredited)
Nino Vingelli
3rd Judge (uncredited)
Vittorio De Sica
Director
Neil Simon
Theatre Play
Neil Simon
Screenplay
Cesare Zavattini
Screenplay
Angelo Binarelli
Production Supervisor
Burt Bacharach
Original Music Composer
Gabriella Borzelli
Hairstylist
Joseph Nathanson
Special Effects Coordinator
Stuart Freeborn
Makeup Artist
Roberto Cuomo
Sound Engineer
Malcolm Cooke
Sound Editor
Les Wiggins
Sound Effects Editor
Leonida Barboni
Director of Photography
Valentina Sturla
Casting Director
Cesare Rovatti
Wardrobe Supervisor
Russell Lloyd
Editor
Maurizio Lodi-Fè
Production Manager
Amato Garbini
Makeup Artist
Orazio Tassara
Production Manager
Norman B. Schwartz
Sound Effects Editor
Maurizio Lodi-Fè
Associate Producer
Mario Garbuglia
Production Design
Piero Tosi
Costume Design
Renato Cadueri
Sound Mixer
Sash Fisher
Sound
John Bryan
Producer
Maurice Binder
Main Title Designer
Dick Horn
Animation
Franco Cirino
Assistant Director
Piero Piccioni
Original Music Composer
Giancarlo Del Brocco
Makeup Artist
Luisa Alessandri
Assistant Director
Giorgio Stegani
Second Unit Director
Richard Talmadge
Second Unit Director
Eugenio Fiori
Boom Operator
Mario Ronchetti
Sound Recordist
Joseph Nathanson
Visual Effects
Roberto D'Ettorre Piazzoli
Assistant Camera
Claudio Ragona
Camera Operator
Arturo Zavattini
Camera Operator
Maurice Binder
Title Designer
Burt Bacharach
Songs
Hal David
Songs