- Patrizi, Francesco, 1275-13281
- Paul, the Apostle, Saint1
- Paul, the Hermit, Saint, -approximately 3411
- Pecia1
- Penance (Canon law)1
- Pentecost1
- Persius1
- Peter, the Apostle, Saint1
- Phaedra (Greek mythological character)1
- Phalaris, Tyrant of Agrigentum, active 6th century B.C.1
- Philosophy, Ancient1
- Physics (Aristotle)1
- Physiology1
- Piccinino, Nicolo, -14441
- Piccolomini, Ambrogio Nese1
- Piccolomini, Barna1
- Piccolomini, Caffino di Bartolomeo1
- Piccolomini, Girolamo1
- Piccolomini, Mino1
- Piccolomini, Nerius Gabrielli de1