- Uganda, Martyrs of
- Ugo Buoncompagni
- Ugolino Brunforte
- Ugolino of Monte Giorgio
- Ugolino, Count of Segni
- Utraquists
- Unction, Extreme
- Union of Brest
- Union, Christian
- union, hypostatic
- Unitas Fratrom
- United Lutheran Church in America
- Unity of Brethren
- Universal Judgment
- University of Aberdeen
- University of Alcala
- University of Angers, France
- University of Avila
- University of Bologna
- University of Cambridge, England
- University of Coimbra, Portugal
- University of Dayton, Ohio
- University of Detroit
- University of Douai, France
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- University of Freiburg im Breisgau
- University of Fribourg, Switzerland
- University of Heidelberg, Germany
- University of Ingolstädt
- University of Louvain
- University of Michigan
- University of Montreal
- University of Notre Dame
- University of Ottawa
- University of Oxford
- University of Padua
- University of Paris
- University of Pavia
- University of Pisa
- University of Rome
- University of Saint Andrews
- University of Saint Francis Xavier's College
- University of Saint Joseph's College
- University of Saint Thomas
- University of Salamanca
- University of Salerno
- University of Santo Tomas
- University, Ashford
- University, Cologne
- University, Concordia
- University, Copenhagen
- University, Creighton
- University, De Paul
- University, Dominican
- University, Duquesne
- University, Fordham
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- University, Georgetown
- University, Glasgow
- University, Gonzaga
- University, John Carroll
- University, Laval
- University, Loyola, Chicago, Illinois
- University, Loyola, New Orleans, Louisiana
- University, Loyola Marymount
- University, Marquette
- University, Marywood
- University, Mount Saint Mary's
- University, Niagara
- University, Queens
- University, Saint Edward's
- University, Saint John's, Minnesota
- University, Saint John's, Ohio
- University, Saint Louis
- University, Santa Clara
- University, Xavier
- unjust aggressor
- unreason, abbot of
- Uromi, Nigeria, diocese of
- Ursula Benincasa, Venerable
- Use of Bangor
- Use of Hereford
- Use of the Bible
- Use, Lincoln
- Use, Sarum
- usurpation
- Utrecht, Netherlands, archdiocese of
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