Opie - Palg
- Opie, Mrs. Amelia (Alderson)
- Oppenheim, E. Phillips
- Orczy, Baroness (Mrs. Montagu Barstow)
- Ordericus Vitalis
- Orm, or Ormin
- Orme, Robert
- Orrery, Roger Boyle, 1st Earl of
- Otway, Cæsar
- Otway, Thomas
- Ouida
- Outram, George
- Overbury, Sir Thomas
- Owen, John
- Owen, Robert
- Oxenham, John
- Oxford, Edward de Vere, Earl of
- Pain, Barry
- Paine, Thomas
- Painter, William
- Paley, William
