- Order of the Golden Fleece1
- Orders of knighthood and chivalry1
- Ordinances, Municipal1
- Ovando, Nicolás de, approximately 1460-15111
- Panama--Panama1
- Pelayo, King of Asturias, -7371
- Penmanship1
- Penmanship manuals1
- Perez Barahona, Juan, active 1560-15621
- Peru (Viceroyalty). Real Caja de Cuzco1
- Philippines1
- Philippines--Manila1
- Pic̨arro, Diego1
- Pizarro, Gonzalo, -15481
- Pizarro, Pedro, active 16th century1
- Political science1
- Portugal1
- Poverty--Religious aspects--Christianity1
- Prayer books1
- Printed waste1