Author
- Sidrac1
- Sigebert of Gembloux1
- Sigmund Hintterkircher1
- Simone Gondi1
- Sirāj al-Dīn Abū Ḥafṣ ʻUmar Ibn al-Wardī1
- Society of Jesus1
- Society of Saint Anne (Malogoszcz, Poland)1
- Stato Nuovo of Siena1
- Suetonius1
- Thomas Howard, 4th Duke of Norfolk1
- Thomas Smith1
- Thomas à Kempis1
- Tommaso Giovanni Alamanni1
- Tommaso Ridolfi1
- Torelli family1
- Uffizio della mercanzia of Florence1
- Umbertus Decembrius1
- Urban VII1
- Urbanus Rhegius1
- Valentin Boltz1