Alec Guinness as Father Brown

Joan Greenwood as Lady Warren

Peter Finch as Gustave Flambeau

Cecil Parker as The Bishop

Bernard Lee as Inspector Valentine

Sid James as Bert Parkinson

Gérard Oury as Inspector Dubois

Ernest Thesiger as The Vicomte

Ernest Clark as Bishop's Secretary

Everley Gregg as Governess

Austin Trevor as The Herald

Marne Maitland as Maharajah

Noel Howlett as Auctioneer

Eugene Deckers as French Cavalry Officer

Jim Gérald as French Stationmaster

Launce Maraschal as Texan Millionaire

Daniel Clérice as Garagiste

Aubrey Woods as Charlie

John Salew as Station sergeant

Sam Kydd as Scotland Yard sergeant

John Horsley as Inspector Wilkins

Jack McNaughton as Railway Guard

Hugh Dempster as Man in Bowler Hat

Betty Baskcomb as French Widow

Diana Van Proosdy as Waitress

Dino Galvani as Italian Professor

Hugo Schuster as Optician

Guido Lorraine as Café Patron