Rex Harrison as William Egerton

Kay Kendall as Monica Hathaway

Margaret Leighton as Miss Chesterman

George Cole as Luigi Sopranelli

Raymond Huntley as J.F. Hassett

Cecil Parker as Llewellyn

Sally Lahee as The Nurse

Nicole Maurey as Lola

Valerie French as Bridget

Ursula Howells as Ann

Jill Adams as Joanna

Roma Dumville as Elizabeth

Robert Coote as The Best Man

Noel Hood as Gladys

Eric Pohlmann as Papa Sopranelli

Marie Burke as Moma Sopranelli

Derek Sydney as Giorgio Sopranelli

Guy Deghy as Stromboli

Michael Hordern as The Judge

Charles Lloyd Pack as The Solicitor

Arthur Howard as Clerk of the Court

John Robinson as Secretary

Michael Ripper as Left Luggage Attendant

Alfred Burke as Porter

Arnold Diamond as Car Loan Manager

Nora Gordon as Housekeeper

Sam Kydd as Adelphi Barman

Jill Melford as Monica's Golf Partner

Myrette Morven as Miss Prosser

Ernie Rice as Cafe Customer

Stuart Saunders as Policeman

Fred Stroud as Adelphi Club Waiter

Stephen Vercoe as Dr. Thompson

Frank Webster as Old Bailey Warden

Leslie Weston as Prison Jailer

Paul Whitsun-Jones as Welsh Farmer

George Woodbridge as Old Bailey Warder

Paul Connell as Cardiff Barman (uncredited)

Jack Carter as Policeman in Court (uncredited)