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

Vittorio De Sica

Himself

Maurice Denham

Chief of Interpol

Tiberio Murgia

1st 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

Timothy Bateson

Michael O'Reilly

David Lodge

Policeman

Lucia Cavalieri

Bingo Player (uncredited)