Austin Trevor as Hercule Poirot

Franklin Dyall as Sir Roger Ackroyd

Elizabeth Allan as Ursula Browne

J.H. Roberts as Dr. Sheppard

John Deverell as Lord Halliford

Ronald Ward as Ralph Ackroyd

Mary Jerrold as Mrs. Ackroyd

Mercia Swinburne as Caryll Sheppard

Harvey Braban as Insp. Davis

Clare Greet as (uncredited)

Diana Beaumont as (uncredited)

Earl Grey as (uncredited)