The Duke / The Banker / The Parson / The General / The Admiral / Young Ascoyne / Young Henry / Lady Agatha

Alec Guinness

Louis Mazzini / His Father

Dennis Price

Edith D'Ascoyne

Valerie Hobson

Sibella Holland

Joan Greenwood

Mama

Audrey Fildes

Mr. Elliott - the Hangman

Miles Malleson

Lord High Steward

Hugh Griffith

Lionel

John Penrose

The Prison Governor

Clive Morton

Young Louis

Jeremy Spenser

Crown Counsel

Cecil Ramage

The Titbits Reporter

Arthur Lowe

Mr. Perkins

John Salew

Inspector Burgoyne

Eric Messiter

Maud

Peggy Ann Clifford

Defence Counsel (uncredited)

Richard Wattis

The Girl in the Punt

Anne Valery

The Farmer

Lyn Evans

The Schoolmistress

Barbara Leake

First Lord Delivering Verdict (uncredited)

Peter Gawthorne

Lady Redpole (uncredited)

Molly Hamley-Clifford

Gamekeeper Hoskins (uncredited)

Leslie Handford

Young Graham (uncredited)

Cavan Malone

Young Sibella (uncredited)

Carol White

Warder in Jail (uncredited)

Laurence Naismith

Clerk of Parliament (uncredited)

Gordon Phillott

Captain (uncredited)

Harold Young

Warder (uncredited)

Stanley Beard

Member of D'Ascoyne Household (uncredited)

Norman Fisher

Warder (uncredited)

Maxwell Foster

Peer of the Realm (uncredited)

Fletcher Lightfoot

Lawyer (uncredited)

Harry Phipps