Aldo Vanucci/Federico Fabrizi

Peter Sellers

Tony Powell

Victor Mature

Gina Vanucci aka "Gina Romantica"

Britt Ekland

Harry

Martin Balsam

Okra

Akim Tamiroff

Polio

Paolo Stoppa

Siepi

Tino Buazzelli

Carlo

Mac Ronay

Mamma Vanucci

Lydia Brazzi

Bikini Girl

Maria Grazia Buccella

Police Chief

Lando Buzzanca

Chief of Interpol

Maurice Denham

Himself

Vittorio De Sica

1st Detective

Tiberio Murgia

2nd Detective

Francesco De Leone

Cafe Owner

Carlo Croccolo

Mayor

Nino Musco

Doctor

Pier Luigi Pizzi

Singer

Lino Mattera

1st Imprisoned

Piero Gerlini

Prosecuting Counsel

Daniele Vargas

Judge

Franco Sportelli

Critic

Giustino Durano

Raymond

Enzo Fiermonte

Marcel Vignon

Roberto De Simone

Fat Actor

Mimmo Poli

Detective

Tiberlo Murgia

Felix Kessler

Angelo Spaggiari

Manuel Ortega

Mario Del Vago

Michael O'Reilly (uncredited)

Timothy Bateson

Police Officer (uncredited)

David Lodge

Pharmacist in Sevalio (uncredited)

Ugo Carboni

Cameraman (uncredited)

Angelo Casadei

Via Veneto café costumer (uncredited)

Amerigo Castrighella

Bingo Player (uncredited)

Lucia Cavalieri

Laundress (uncredited)

Bruna Cealti

(uncredited)

Carlo Delle Piane

(uncredited)

Daniela Igliozzi

Movie Director on Via Veneto (uncredited)

Enrico Luzi

Street Spectator (uncredited)

Alba Maiolini

Woman in Sevalio (uncredited)

Maria Grazia Marescalchi

Bingo Player (uncredited)

Peggy Nathan

2nd Judge (uncredited)

Carlo Pisacane

Salvatore's Wife (uncredited)

Marcella Rovena

Restaurant Customer (uncredited)

Alessandro Tedeschi

3rd Judge (uncredited)

Nino Vingelli