- Penitentials1
- Perini, Francesco, 1811-18831
- Pero, Antonio del1
- Pero, Gaspero del1
- Perocti, Maruccio1
- Persian language--Lexicography1
- Personal correspondence1
- Petrini, Mattea1
- Petronibus, Ludovicus Salimbeni de1
- Phaedra (Greek mythological character)1
- Phalaris, Tyrant of Agrigentum, active 6th century B.C.1
- Pharmacology1
- Philip III, King of Spain, 1578-16211
- Philip IV, King of Spain, 1605-16651
- Philosophy and religion1
- Philosophy, Ancient1
- Philosophy, Medieval1
- Philoxenus, Bishop of Hierapolis, approximately 440-5231
- Piccolomini d'Aragona, Antonio di Nanni Todeschini, Duke of Amalfi1
- Piccolomini di Castiglia e d'Aragona, Giacomo di Nanni Todeschini1