- Who is it: Unger, Roberto Mangabeira in Philosophy
- Who is it: Urmson, JO in Philosophy
- Who is: Udayana in Philosophy
- Who is: Ulrich de Strasbourg in Philosophy
- Who is: Ulpiano in Philosophy
- What is it: Unity of Judgment in Philosophy
- What is it: Reflection Unit in Philosophy
- What is it: Universalization of Knowledge in Philosophy
- What is it: Unity of Meaning in Philosophy
- What is: Unit of Intuition in Philosophy
- What is it: Universalization of Reason in Philosophy
- What is it: Unity of Truth in Philosophy
- What is it: Unipotence in Philosophy
- What is it: Unity of Reality in Philosophy
- What is it: Unity of Essence in Philosophy
- What is it: Unidirectionality in Philosophy
- What is it: Universality of Values in Philosophy
- What is it: Unit of Knowledge in Philosophy
- What is it: Unit of Perception in Philosophy
- What is it: Unity of Vision in Philosophy
- What is it: Unity of Will in Philosophy
- What is it: Unidimensionality of Being in Philosophy
- What is it: Unit of Motivation in Philosophy
- What is it: Unanimity in Philosophy
- What is it: Unit of Direction in Philosophy
- What is it: Universality of Principles in Philosophy
- What is: Unity of Intention in Philosophy
- What is it: Ultramaterialism in Philosophy
- What is it: Unity of Meaning in Philosophy
- What is it: Unit of Value in Philosophy
- What is it: Unit of Action in Philosophy
- What is: Unity of Purpose in Philosophy
- What is it: Ultraminimalism in Philosophy
- What is it: Public Utility in Philosophy
- What is it: Existential Unity in Philosophy
- What is it: Unity of Thought in Philosophy
- What is it: Universalization in Philosophy
- What is it: Unity of Consciousness in Philosophy
- What is it: Unification of Being in Philosophy
- What is it: Overtaking in Philosophy
- What is it: Univocal in Philosophy
- What is it: Universality in Philosophy
- What is it: Utility in Philosophy
- What is it: Uniformity in Philosophy
- What is it: Unification in Philosophy
- What is it: Unidimensionality in Philosophy
- What is it: Universals in Philosophy
- What is it: Unilaterality in Philosophy
- What is it: Ultrarealism in Philosophy
- What is it: Utopia in Philosophy
- What is it: Uniqueness in Philosophy
- What is it: Unity in Philosophy
- What is it: Universalism in Philosophy
- What is it: Utilitarianism in Philosophy
- What is it: Action Utilitarianism in Stoicism
- What is it: Universality of Truth in Stoicism
- What is it: Unity of Action in Stoicism
- What is it: Urbanity of Speech in Stoicism
- What is it: Unanimity of Virtue in Stoicism
- What is it: Utility of Knowledge in Stoicism
- What is it: Outrage at Injustice in Stoicism
- What is it: Unification of Intentions in Stoicism
- What is it: Uniqueness of Value in Stoicism
- What is it: Practical Utilitarianism in Stoicism
- What is it: Universality of Law in Stoicism
- What is: Unity of Will in Stoicism
- What is it: Urbanity of Behavior in Stoicism
- What is it: Unanimity of Opinion in Stoicism
- What is it: Utility of Virtue in Stoicism
- What is it: Moral Outrage in Stoicism
- What is it: Unification of Desires in Stoicism
- What is it: Uniqueness of Existence in Stoicism
- What is it: Ethical Utilitarianism in Stoicism
- What is it: Universality of Virtue in Stoicism
- What is: Unity of Purpose in Stoicism
- What is it: Urbanity in Stoicism
- What is it: Unanimity in Stoicism
- What is it: Utility in Stoicism
- What it is: Outrage in Stoicism
- What is it: Unification in Stoicism
