| Hugh Desmond Lester | Crain | Hill House's original owner. |
| Miss | Crain | Hugh's youngest daughter. |
| Sophia Anne | Crain | Hugh's oldest daughter. AKA: Old Miss Crain. |
| Mrs. | Dudley | The Hill House cook. Dudley's husband. |
| Black | Michael | The man that Theo is supposed to marry. |
| John | Montague | Doctor of Philosophy. |
| Mrs. | Montague | Dr. Montague's wife. |
| Arthur | Parker | Mrs. Montague's companion. |
| Gloria | Sanderson | Current owner of Hill House. Luke's aunt. |
| Luke | Sanderson | The heir of Hill House. One of Dr. Montague's test subjects. |
| Mrs. | Sanderson | Luke's mother. |
| Eleanor | Vance | Protagonist. AKA: Nell, Nellie. |
| Carrie | | Eleanor's sister. |
| Dancer | | Eleanor's former cat. |
| Dudley | | The Hill House caretaker. |
| Edna | | Theo's aunt. |
| Helen | | A spirit. |
| Homer | | The man from the credit office. |
| Linnie | | Carrie's daughter. |
| Merrigot | | The planchette's control. |
| Muriel | | Theo's aunt. |
| Nell | | The spirit. |
| Theodora | | One of Dr. Montague's test subject. AKA: Theo. |