Dr. Hawley Harvey Crippen

Belle Crippen

Ethel Le Neve

R.D. Muir (as Sir Donald Wolfit)

Captain McKenzie

Mr. Tobin

Dr. Pepper

Mrs. Clara Arditti

Mrs. Jackson

Bruce Martin

Chief Inspector Dew

Lord Chief Justice

Harry

The Governor

Dr. Rogers

Mr. Arditti

Miss Curnow

Harding

Chemist

Police Sergeant Outside Courtroom (uncredited)

Defence QC Clerk (uncredited)

Radio Officer Andrews (uncredited)

Ships Steward (uncredited)

Courtroom Spectator (uncredited)