- Transubstantiation1
- Treasure bindings1
- Tree calf bindings1
- Trenta, Francesco1
- Treviso (Italy). Podestà1
- Trials1
- Trials, litigation, etc.1
- Trigonometry1
- Trinity--History of doctrines1
- Tucci, Niccolò, 1908-19991
- Turenne, Antoine de La Tour d'Auvergne, vicomte de1
- Typology (Theology)1
- Ugo, Giacoma di1
- Ugo, Piero di1
- Ugolino, Lodovico di1
- Ulivieri, Petronio1
- Ulric, Saint, Bishop of Augsburg, 890-9731
- Umidis, Jacomo di Pietro de1
- Universities and colleges1
- Universität Wien. Kollegium St. Nikolaus1