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)