Mrs. Cecil Ackroyd (widow of brother Roger Ackroyd)

Hercule Poirot

Dr. James Sheppard

Roger Ackroyd

inspector

Blent major

Caroline (Dr. Sheppard's sister)

Parker (butler at the house of Roger Ackroyd)

Joffrey Raymond (secretary of Ackroyd)

housemaid

Charles Kent

Mrs. Foliot

Mrs. Ferrar

Ralph Peyten (adopted son of Roger Ackroyd)

Hammond (attorney in affairs of Roger Ackroyd)

Flora (daughter of Mrs. Ackroyd)

Miss Russell (The housekeeper in the house of Roger Ackroyd)

cook

steward

gardener

Ursula Born (Senior maid at the house of Roger Ackroyd)