- Ugo, Piero di1
- Ugolino, Lodovico di1
- Ulric, Saint, Bishop of Augsburg, 890-9731
- Umidis, Jacomo di Pietro de1
- Underscoring1
- United States1
- Urine--Analysis2
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- Urology1
- Ushnuhī, ʻAbd al-ʻAzīz ibn ʻAlī, 12th cent. Kifāyah fī al-farāʼiḍ1
- Ustarūshanī, Muḥammad ibn Maḥmūd, -1234 or 1235. Fuṣūl1
- Usury1
- Utopias1
- Uzbekistan--Samarqand2
- Valdenoceda (Spain)3
- Valguarnera family1
- Valla, Lorenzo, 1407-14571
- Vallombrosans2
- Vanne, Benedetto di1
- Vannello, Giovanni di1