- Nile River1
- North America--New France1
- North, Edward North, Baron, 1496?-15641
- Notaries1
- Nouel, Jacques, 1551-1
- Order of the Golden Fleece1
- Ordinances, Municipal1
- Orta, Garcia de, active 16th century1
- Orthodox Eastern Church1
- Ospedale degli Innocenti (Florence, Italy)1
- Otto I, Holy Roman Emperor, 912-9731
- Ovando, Nicolás de, approximately 1460-15111
- Oviedo family1
- Oviedo, Francisco de, 1728-1
- Oviedo, Gregorio de, 1721-17961
- Oviedo, Nicolás de, 1725-1
- Paganelli, Roberto1
- Pakhomiĭ Logofet, monk, active 15th century1
- Panama--Panama1
- Paolo, Stefano di1