- Ubaldinus, Octavianus (comes Mercatellus): 11.
- Uchanski, Paullus: 989.
- Udall, John: 1641.
- Uffele, S. van (clerk of the city of Antwerp): 108, 569.
- Uligerius, Aegidius: 2427.
- Ulloa, Pedro de: 939A.
- Ulpius, Joannes: 1135.
- Umara, Francisco de: 2096.
- Ursinus, Fulvius (episcopus Spoletinus): 1232, 1235.
- Ursinus (Orsini, Ursino), Fulvius (Fulvio): 854, 855, 856, 857, 917, 967, 992, 1083, 1122, 1519, 1753, 2054, 2081, 2168, 2203, 2224, 2263, 2312, 2348, 2349, 2350.
- Usuardus: 1707.
- Uten, Petrus: 1117.
- Utenhovius (d'Utenhove), Carolus (Charles): 1253, 2155.
- Uten Waele, Paul (engraver): 865, 867, 1152, 1153, 1699.
- Uzeda (comes): 1239.