- Norbert, of Xanten, Saint, approximately 1080-11341
- North, Edward North, Baron, 1496?-15641
- Northern Europe1
- Northwest Africa--Atlantic Coast1
- Notaries (Canon law)1
- Notaries (Roman law)1
- Novi, Lisa di1
- Nuns1
- Nuti, Giovanni, 1952-1
- Obligations (Law)1
- Obstetrics1
- Occasional poems1
- Occasional verse1
- Octavia, Empress, consort of Nero, Emperor of Rome, approximately 42-621
- Odes1
- Odes, Latin (Medieval and modern)1
- Odilo, Saint, Abbot of Cluny, 962-1048 or 10491
- Odo, Saint, Abbot of Cluny, approximately 879-9421
- Oedipus (Greek mythological figure)1
- On the generation of animals (Aristotle)1