

| U.S. National Catholic Rural Conference | Isidore the Farmer |
| Uganda | Mary, Queen of Africa |
| Ukraine | Josaphat |
| Ukrainian Catholic Diocese of Stamford, Connecticut, USA | Volodymyr the Great |
| Undertakers | Dismas |
| United States Army Special Forces | Philip of Agirone |
| United States National Rural Life Conference | Isidore the Farmer |
| United States of America | Immaculate Conception of Mary |
| Unity of the Eastern and Western Churches | Cyril and Methodius |
| Universal Church | Joseph, Peter the Apostle |
| Universities | Bl. Contardo Ferrini |
| Universities, Catholic | Thomas Aquinas |
| University of Oxford, England | Frideswide |
| University of Patras, Greece | Andrew, Apostle |
| University of Santo Tomas Faculty of Engineering | Jordan of Saxony |
| Unmarried women | Nicholas of Myra |
| Upper Auvergne | Gerald of Aurillac |
| Urban University, Rome | Oliver Plunket |
| Uruguay | Blessed Virgin Mary, Our Lady of Lujan, Philip and James, Apostles |
| Utah, USA | Our Lady of the Snows |
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