- Persephone (Greek deity)1
- Persius1
- Pesciori, Guglielmo1
- Petrini, Mattea1
- Petronibus, Agabitus de1
- Petronibus, Ludovicus Salimbeni de1
- Petronibus, Petronius Caterini de1
- Petronibus, Petronius de1
- Phaedra (Greek mythological character)1
- Phalaris, Tyrant of Agrigentum, active 6th century B.C.1
- Pharmacognosy1
- Pharmacology1
- Pharmacy1
- Philip III, King of Spain, 1578-16211
- Philip, Duke of Burgundy, 1396-14671
- Philipp I, Landgraf von Hessen, 1504-15671
- Philosophy and religion1
- Philosophy, Ancient1
- Philosophy, Medieval1
- Piccolomini d'Aragona, Antonio di Nanni Todeschini, Duke of Amalfi1