- Siege of Istanbul (Istanbul, Turkey : 1453)1
- Siege warfare1
- Siena (Italy). Balia1
- Siena (Italy). Tribunale dei Pupilli1
- Signification (Logic)1
- Sikh gurus1
- Sikhism1
- Silva, Juan de, Conde de Cifuentes1
- Silver bindings1
- Silver mines and mining1
- Silvestro, Jacopo di1
- Simile1
- Simon, de Cremona, -13901
- Simone, Francesco di1
- Sin--Christianity1
- Since 6401
- Sirāj Allāh, Muḥammad, active 19th century. Sirāj-i anjan.--Daftar 21
- Sittūn masʼalah fī al-fiqh (Zāhid, Aḥmad ibn Muḥammad)1
- Situnah1
- Siwāsī, Muṣṭafá ibn Abī Bakr, d. 1824 or 5. Mafātīḥ al-durrīyah fī ithbāt al-qawānīn al-Darīyah1