- Stefano, Simone di1
- Stoics1
- Storytelling1
- Strozzi, Nanni, 1376-14271
- Strozzi, Niccolò1
- Sumptuary laws1
- Sundials1
- Surgery1
- Surgical instruments and apparatus1
- Sveti Nikola (Abbey : Šibenik, Croatia)1
- Switzerland--Basel-Landschaft (Canton)1
- Switzerland--Lucerne1
- Switzerland--Monthey1
- Symbolism of numbers1
- Tacketed bindings1
- Tactics1
- Talbot, Gilbert, Sir, of Grafton1
- Talismans1
- Talkhīṣ aʻmāl al-ḥisāb (Ibn al-Bannāʼ, Aḥmad ibn Muḥammad)1
- Tarquinius Superbus, Lucius, King of Rome, active 534 B.C.-510 B.C.1