- Personal correspondence1
- Peter Lombard, Bishop of Paris, approximately 1100-11601
- Peter, the Apostle, Saint1
- Petrarca, Francesco, 1304-13741
- Phalaris, Tyrant of Agrigentum, active 6th century B.C.1
- Pharmacognosy1
- Pharmacology1
- Pharmacy1
- Philip II, King of Spain, 1527-15981
- Philosophers, Ancient1
- Philosophers, Ancient--Biography1
- Philosophy, Ancient1
- Physical appearance of Jesus Christ1
- Physical sciences1
- Pigments1
- Pistus, Augustus1
- Pius V, Pope, 1504-15721
- Planets--Orbits1
- Poetics (Aristotle)1
- Poland1