- Piccolomini della Triana, Silvio, 1878-19623
- Piccolomini, Ascanio Francesco3
- Prescriptions, formulae, receipts, etc.3
- Prophets, Pre-Islamic3
- Rites and ceremonies3
- Rome (Empire)3
- Salviati, Costanza3
- Saudi Arabia--Mecca3
- Seals (Numismatics)3
- Seals, wax3
- Sharḥ al-Wiqāyah (Maḥbūbī, ʻUbayd Allāh ibn Masʻūd)3
- Shi bu--Bian nian lei--Tong dai3
- Shīʻah--Doctrines3
- Spain--Madrid3
- Spain--Toledo3
- Sufism--Doctrines3
- Tales3
- Talkhīṣ Miftāḥ al-ʻulūm (Qazwīnī, Jalāl al-Dīn Muḥammad ibn ʻAbd al-Raḥmān)3
- Theology3
- Tolomei, Lelio3