- Soderini, Piero, 1452-15221
- Soul--Philosophy1
- Spain--Aragon1
- Spanish (culture or style)1
- Spedale di Santa Maria della Scala (Siena, Italy)1
- Spedalingo, Antonio1
- Spedalingo, Taddeo1
- Spini, Giacomo1
- Spinola family1
- Spiritual life--Catholic Church1
- Stefano, Caterina di1
- Stefano, Niccolò di1
- Stefano, Simone di1
- Strozzi, Nanni, 1376-14271
- Sundials1
- Surveying1
- Tactics1
- Tasʹhīl al-fawāʼid wa-takmīl al-maqāṣid (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)1
- Theology, Doctrinal1
- Theology--Manuscripts1