- Hercule Poirot – retired private detective, living in the village
- Dr James Sheppard – the local doctor, Poirot's assistant in his investigations, and the novel's narrator
- Caroline Sheppard – Dr Sheppard's unmarried sister
- Roger Ackroyd – the victim of the case. A wealthy businessman and widower
- Mrs Ferrars – widow who commits suicide at the start of the novel
- Mrs Cecil Ackroyd – widow of Roger's brother Cecil
- Flora Ackroyd – Ackroyd's niece, Cecil's daughter
- Captain Ralph Paton – Ackroyd's stepson from his late wife's previous marriage
- Major Hector Blunt – Ackroyd's friend, a guest of the household
- Geoffrey Raymond – Ackroyd's personal secretary
- John Parker – Ackroyd's butler
- Elizabeth Russell – Ackroyd's housekeeper
- Charles Kent – Russell's illegitimate son
- Ursula Bourne – Ackroyd's parlourmaid
- Inspector Davis – local police inspector for King's Abbot
- Inspector Raglan – police Inspector
- Colonel Melrose – Chief constable for the county
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