- Petrarca, Francesco, 1304-13741
- Pharmacognosy1
- Pharmacology1
- Pharmacy1
- Philip II, King of Macedonia, 382 B.C.-336 B.C.1
- Philosophers, Ancient1
- Philosophers, Ancient--Biography1
- Philosophy and religion1
- Philosophy, Ancient1
- Philosophy, Medieval, in literature1
- Physical appearance of Jesus Christ1
- Physical sciences1
- Pigments1
- Pistus, Augustus1
- Pius V, Pope, 1504-15721
- Plague in literature1
- Planets--Orbits1
- Poetics (Aristotle)1
- Political science1
- Pompey, the Great, 106 B.C.-48 B.C.1