Peter Sellers
Aldo Vanucci / Federico Fabrizi
Victor Mature
Tony Powell
Britt Ekland
Gina Vanucci aka "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
Vittorio De Sica
Himself
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
Timothy Bateson
Michael O'Reilly
David Lodge
Policeman
Lucia Cavalieri
Bingo Player (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