U
- Ubuntu philosophySouthern African philosophy
- UisangUisang (Korean: 의상; Hanja: 義湘; 625–702) was one of the most eminent early Silla Korean sch
- Ultimate Boeing 747 gambitCounter-argument to an argument for the existence of God
- Umm al-BarahinIslamic theological treatise
- UnderstandingAbility to think about and use concepts to deal adequately with a subject
- Unfulfilled Christian religious predictionsThis article lists Christian religious predictions that failed to come about in the specif
- Universal (metaphysics)Characteristic or qualities that particular things have in common
- UnkulunkuluZulu mythological figure
- Unmoved moverPostulated primary cause of all activity in the universe
- UnobservableEntity not directly observable by humans
- Upadeśasāhasrī8th-century text of Adi Shankara
- UthraInhabitants of the World of Light in Mandaeism
- Utilitarian ruleDecision rule of maximizing utility
- UtilitarianismEthical theory based on maximizing well-being
- Utilitarianism (book)1861 essay by John Stuart Mill
- Utility monsterThought experiment critiquing utilitarianism
- Utopia, OhioUtopia is an unincorporated community in far southern Franklin Township, Clermont County,