- Persius1
- Personal correspondence1
- Perush Rashi ʻal ha-Torah (Rashi)1
- Pesciori, Guglielmo1
- Peter Lombard, Bishop of Paris, approximately 1100-1160. Sententiarum libri II1
- Pharmacognosy1
- Pharmacology1
- Pharmacy1
- Philip II, King of Macedonia, 382 B.C.-336 B.C.1
- Philip II, King of Spain, 1527-15981
- Philosophy, Ancient1
- Physical appearance of Jesus Christ1
- Physical sciences1
- Physicians1
- Pigments1
- Pilgrims and pilgrimages1
- Pius V, Pope, 1504-15721
- Planetary theory1
- Planets--Orbits1
- Poetics (Aristotle)1