- Sparano, Matteo1
- Spedale di Santa Maria Annunziata (San Miniato, Italy)1
- Speziale, Giovanni1
- Sphaera mundi (Sacro Bosco, Joannes de)1
- Spinelli, Pietro1
- Spiritual life1
- Squillace, Sigismondo1
- State, The1
- Stefani, Nicola1
- Strozzi, Giovanni1
- Stuart, House of1
- Sufi literature1
- Sufi poetry, Arabic1
- Summa theologica (Thomas, Aquinas, Saint)1
- Switzerland--Lucerne1
- Syria--Aleppo1
- Syria--Ṣāliḥīyah1
- Süleyman I, Sultan of the Turks, 1494 or 1495-15661
- Tajrīd al-iʻtiqād (Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad)1
- Tales1