- Ugolino, Lodovico di1
- Ulric, Saint, Bishop of Augsburg, 890-9731
- Umidis, Jacomo di Pietro de1
- Umm al-barāhīn fī ʻilm al-kalām (Sanūsī, Muḥammad ibn Yūsuf)1
- Underscoring1
- United States1
- Urjūzah fī al-ṭibb (Avicenna)1
- Urology1
- Ushnuhī, ʻAbd al-ʻAzīz ibn ʻAlī, 12th cent. Kifāyah fī al-farāʼiḍ1
- Ustarūshanī, Muḥammad ibn Maḥmūd, -1234 or 1235. Fuṣūl1
- Usury1
- Utopias1
- Valguarnera family1
- Valla, Lorenzo, 1407-14571
- Vanne, Benedetto di1
- Vannello, Giovanni di1
- Vannoli, Nanne1
- Vaṭvāṭ, Rashīd al-Dīn Muḥammad ibn Muḥammad, approximately 1114-approximately 1182. Ḥadāyiq al-siḥr fī daqāyiq al-shiʻr1
- Veins1
- Vellum printings1