- Paul V, Pope, 1552-16211
- Persephone (Greek deity)1
- Pesciori, Guglielmo1
- Pharmacognosy1
- Pharmacology1
- Pharmacy1
- Philip IV, King of Spain, 1605-16651
- Piccolomini, Alessandro1
- Piccolomini, Antonio Maria d'Enea1
- Piccolomini, Giacomo d'Antonio Maria d'Enea1
- Piccolomini, Giovanni d'Andrea di Nanni Todeschini, 1475-15371
- Pictorial works1
- Pius IV, Pope, 1499-15651
- Pius V, Pope, 1504-15721
- Poor Clares1
- Popes1
- Popes--Election1
- Popes--Temporal power1
- Poverty--Religious aspects--Christianity1
- Prayers1