- Umm al-barāhīn fī ʻilm al-kalām (Sanūsī, Muḥammad ibn Yūsuf)1
- Urjūzah al-Raḥbīyah (Ibn al-Mutafanninah, Muḥammad ibn ʻAlī)1
- Ustarūshanī, Muḥammad ibn Maḥmūd, -1234 or 1235. Fuṣūl2
- Uzbekistan--Samarqand1
- Voyages and travels1
- Waqf13
- Waraqāt (Imām al-Ḥaramayn al-Juwaynī, ʻAbd al-Malik ibn ʻAbd Allāh)1
- Water clocks1
- Water--Religious aspects--Islam1
- Watermarks38
- Waṣīyah (Abū Ḥanīfah)8
- Weights and measures, Arab1
- Wills, Ethical23
- Witnesses (Islamic law)1
- Yaʻqūb ibn Khiḍr, d. 1480. ḥāshiyah ʻalá sharḥ Ṣadr al-Sharīʻah1
- Yemen (Republic)--Zabīd1
- Yāsamīnīyah (Ibn al-Yāsamīn, ʻAbd Allāh ibn Ḥajjāj)1
- Zaydīyah--Doctrines1
- Zaylaʻī, ʻUthmān ibn ʻAlī, -1342 or 1343. Tabyīn al-ḥaqāʼiq sharḥ Kanz al-daqāʼiq1
- autographs (manuscripts)1