- Siena (Italy). Tribunale dei Pupilli1
- Silver tooled bindings1
- Sin1
- Sint-Pietersabdij (Ghent, Belgium)1
- Sirāj (Maimonides, Moses)1
- Spain--Barcelona1
- Spain--Toledo1
- Spini, Antonio1
- Spirits1
- Subkī, Taqī al-Dīn ʻAlī ibn ʻAbd al-Kāfī, 1284-13551
- Sufi poetry, Arabic1
- Sufism--Customs and practices1
- Suhrawardī, ʻUmar ibn Muḥammad, 1145-1234. ʻAwārif al-maʻārif1
- Summa theologica (Thomas, Aquinas, Saint)1
- Sunan (Abū Dāʼūd Sulaymān ibn al-Ashʻath al-Sijistānī)1
- Sunan (Ibn Mājah, Muḥammad ibn Yazīd)1
- Sunan al-kubrá (Bayhaqī, Aḥmad ibn al-Ḥusayn)1
- Switzerland1
- Syria1
- Tabernacle1