- North, Edward North, Baron, 1496?-15641
- Notaries1
- Ordinances, Municipal1
- Orta, Garcia de, active 16th century1
- Ovando, Nicolás de, approximately 1460-15111
- Oviedo family1
- Oviedo, Francisco de, 1728-1
- Oviedo, Gregorio de, 1721-17961
- Oviedo, Nicolás de, 1725-1
- Panama--Panama1
- Papal nuncios1
- Penmanship1
- Perez Barahona, Juan, active 1560-15621
- Persian language--Rhetoric1
- Peru (Viceroyalty). Real Caja de Cuzco1
- Peru--Lima1
- Peucer, Kaspar, 1525-16021
- Pezel, Christoph, 1539-16041
- Philip II, King of Spain, 1527-15981
- Philip III, King of Spain, 1578-16211