- Stefani, Nicola1
- Stefani, Stefano1
- Stefano, Caterina di1
- Stefano, Guida di1
- Stefano, Niccolò di1
- Stefano, Simone di1
- Strozzi, Niccolò1
- Sugrīva (Hindu mythology)1
- Surgery1
- Surgical instruments and apparatus1
- Sveti Nikola (Abbey : Šibenik, Croatia)1
- Switzerland--Basel-Landschaft (Canton)1
- Switzerland--Lucerne1
- Switzerland--Monthey1
- Symbolism of numbers1
- Süleyman I, Sultan of the Turks, 1494 or 1495-15661
- Sāṅkhyakārikā (Īśvarakr̥ṣṇa)1
- Sāṅkhyasūtra (Kapila)1
- Talkhīṣ aʻmāl al-ḥisāb (Ibn al-Bannāʼ, Aḥmad ibn Muḥammad)1
- Tarkabhāṣā (Keśavamiśra)1