Norman Wisdom as Norman Pitkin / Giulio Napolitani

Jennifer Jayne as Rosanna Guardia

Raymond Huntley as Sir Ronald Ackroyd

David Lodge as Inspector Hobson

Esma Cannon as Mrs. Timms

Eric Barker as Police Doctor

Eleanor Summerfield as Sergeant Lucilla Wilkins

Ronnie Stevens as Oberon

Terence Alexander as Chief Superintendent Bert Belcher

Maurice Kaufmann as Vince

Dilys Laye as American Lady

George Pastell as Manzini

Jack Watson as Police Sergeant

Campbell Singer as Bollington

Lionel Murton as Man on Underground Train

Robert Rietti as Italian Lawyer

Marjie Lawrence as Crying Lady

Peggy Ann Clifford as Mrs. Napolitani

Jean Aubrey as Lady Hinchingford

Monte Landis as Mr. Bassett

Mario Fabrizi as Newspaper Seller

Alfred Burke as Trigger O'Flynn

Fredric Abbott as (uncredited)

John Adams as Detective (uncredited)

Frank Andrews as Detective (uncredited)

Barbara Bennett as Woman in Street (uncredited)

John Blythe as Chauffeur (uncredited)

Tony Castleton as Police Constable (uncredited)

Cyril Chamberlain as Café Proprietor (uncredited)

Pauline Chamberlain as Hairdresser (uncredited)

Mike Conner as Police Constable (uncredited)

John Corrie as Constable (uncredited)

Sophia Dawn as Woman at Hairdressers

Reggie de Beer as Man in Street (uncredited)

Heather Downham as Receptionist (uncredited)

Joe Dunne as Police Constable (uncredited)

Eve Eden as Woman at Hairdressers (uncredited)

Mabel Etherington as Woman at Hairdressers (uncredited)

Roy Everson as Police Constable (uncredited)

Christa Graaf as Teenager (uncredited)

Ursula Granville as Wedding Guest (uncredited)

Fred Griffiths as Cabbie (uncredited)

Victor Harrington as Senior Policeman (uncredited)

Walter Henry as Police Constable

Billy John as Man on Tube (uncredited)

Tutte Lemkow as Billposter (uncredited)

Jack Mandeville as Man on Tube (uncredited)

Larry Martyn as Yob in Café (uncredited)

Colin McKenzie as Police Constable / Man in Street (uncredited)

Alan Meacham as Constable (uncredited)

Stanley Morgan as Police Inspector (uncredited)

Fred Nicholas as Police Constable (uncredited)

Julian Orchard as Wedding Photographer (uncredited)

Lisa Page as Receptionist (uncredited)

John Preston as Superintendent (uncredited)

Pat Ryan as Police Sergeant (uncredited)

Anita Sharp-Bolster as Woman at Hairdressers (uncredited)

Jack Silk as Police Driver (uncredited)

Jeff Silk as Police Driver (uncredited)

Frank Singuineau as Porter (uncredited)

John Smart as Man on Tube (uncredited)

Larry Taylor as O'Flynn's Henchman (uncredited)

Reg Thomason as Man on Tube (uncredited)

Laura Thurlow as Woman on Tube (uncredited)

James Ure as Man on Tube (uncredited)

Valerie Van Ost as Woman at Hairdressers (uncredited)

Wanda Ventham as Outraged Hairdressers Customer (uncredited)

Robert Vossler as Man on Tube (uncredited)

Bill Westley Sr. as Superintendent (uncredited)

Alister Williamson as Detective (uncredited)