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- Sampling bias
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- Saving the Appearances: A Study in Idolatry
- Savior sibling
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- Scalar implicature
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- Selection
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- Self-concept
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- Self-deception
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- Self-determination
- Self-efficacy
- Self-evidence
- Self-fulfilling prophecy
- Self-indication assumption
- Self-indication assumption doomsday argument rebuttal
- Self-love
- Self-organizing system
- Self-preservation
- Self-realization
- Self-reference
- Self-reference puzzle
- Self-referencing doomsday argument rebuttal
- Self-refuting idea
- Self-Reliance
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- Self-serving bias
- Self (philosophy)
- Self control
- Selfishness
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- Sentences
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- Sign
- Sign (semiotics)
- Significant other
- Sign (semiotics)
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- Silvio Ceccato
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- Simple (philosophy)
- Simple commodity production
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- Sirhak
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- Six Myths about the Good Life
- Skandha
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- Sketch for a Theory of the Emotions
- Skolem's paradox
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T
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- Ta Hsueh
- Table of Opposites
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- Tasos Zembylas
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- Tawhid
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- Te
- Teaching for social justice
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- Teaism
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- Technics and Time, 1
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- The Imaginary (Sartre)
- The Inclusion of the Other
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- The International Association for Philosophy and Literature
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- The Judgment
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- The Methods of Ethics
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- The Oxford Companion to Philosophy
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- The Possessed (play)
- The Postmodern Condition
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- The Raven: Anarchist Quarterly
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- The Selfish Genius
- The Seminars of Jacques Lacan
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- The Silent Men
- The Simpsons and Philosophy: The D'oh! of Homer
- The Situations and Names of Winds
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- The State Is Your Enemy
- The Story of My Heart
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- The Stranger (Camus novel)
- The Structural Transformation of the Public Sphere
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- The Subjection of Women
- The Sublime Object of Ideology
- The survival lottery
- The Survivors of the 'Jonathan'
- The Symbolic Species
- The System of Economic Contradictions, or The Philosophy of Poverty
- The System of Nature
- The Tao of Wu
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- The Tyranny of Structurelessness
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- The Virtue of Selfishness
- The Vision of the Anointed
- The Wealth of Nations
- The Will to Believe
- The Will to Power (manuscript)
- The Work of Art in the Age of Mechanical Reproduction
- The World (Descartes)
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- Theatre of the Absurd
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- Theoria – A Swedish Journal of Philosophy
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- Theses on Feuerbach
- Thesis
- Thesis, antithesis, synthesis
- Theurgy
- Thick Black Theory
- Thick concept
- Thierry de Duve
- Thierry of Chartres
- Thieves in Black
- Thing in itself
- Things
- Think (journal)
- Think: A Compelling Introduction to Philosophy
- Thinker's Library
- Thinking
- Thinking about Consciousness
- Third-cause fallacy
- Third camp
- Third eye
- Third man argument
- Third Position
- Third Way (centrism)
- Thirdness
- Thirteen Classics
- Thirtha prabandha
- Thisness
- Thomas-Institut
- Thomas A Kempis
- Thomas A. McCarthy
- Thomas Abbt
- Thomas Aquinas
- Thomas Aquinas and the Sacraments
- Thomas Baldwin (philosopher)
- Thomas Bradwardine
- Thomas Brown (philosopher)
- Thomas Browne
- Thomas Cajetan
- Thomas Carlyle
- Thomas Common
- Thomas Cooper (US politician)
- Thomas Davidson (philosopher)
- Thomas Gallus
- Thomas Gisborne
- Thomas Hastie Bell
- Thomas Hemerken
- Thomas Henry Huxley
- Thomas Hill Green
- Thomas Hobbes
- Thomas J. McKay
- Thomas Jay Oord
- Thomas Jefferson
- Thomas Keell
- Thomas Kuhn
- Thomas Metzinger
- Thomas Molnar
- Thomas More
- Thomas Munro
- Thomas Nagel
- Thomas of Sutton
- Thomas of Villanova
- Thomas of York (Franciscan)
- Thomas Paine
- Thomas Percival
- Thomas Pogge
- Thomas Reid
- Thomas Robert Malthus
- Thomas S. Kuhn
- Thomas Samuel Kuhn
- Thomas Spencer Baynes
- Thomas Talbott
- Thomas Taylor (neoplatonist)
- Thomas Tymoczko
- Thomas V. Morris
- Thomas Vaughan (philosopher)
- Thomas White
- Thomas Wilton
- Thome H. Fang
- Thomism
- Thoralf Skolem
- Þorsteinn Gylfason
- Thought
- Thought experiment
- Thought Forms
- Thought of Thomas Aquinas
- Thoughtform
- Thoughts on Machiavelli
- Thoughts on the True Estimation of Living Forces
- Thrasymachus
- Thrasymachus of Corinth
- Three-valued logic
- Three Critics of the Enlightenment
- Three Dialogues between Hylas and Philonous
- Three marks of existence
- Three men make a tiger
- Three Principles of the People
- Three sided football
- Three Treasures (Taoism)
- Three Worlds Theory
- Threefold Training
- Thrownness
- Thubten Gyatso (Australian monk)
- Thucydides
- Thumos
- Thus Spoke Zarathustra
- Ti (concept)
- Tian
- Tibetan Buddhism
- Tibor R. Machan
- Ticking time bomb scenario
- Tilman Pesch
- Tim Crane
- Tim Dean
- Timaeus (dialogue)
- Timaeus of Locri
- Timaeus the Sophist
- Time
- Time and Free Will
- Time loop
- Time preference
- Time slice
- Time travel
- Timeline of Eastern philosophers
- Timeline of Niccolò Machiavelli
- Timeline of philosophers
- Timeline of Western philosophers
- Timo Airaksinen
- Timocrates of Lampsacus
- Timolaus of Cyzicus
- Timon (philosopher)
- Timon of Philius
- Timon of Phlius
- Timothy Chambers
- Timothy Smiley
- Timothy Sprigge
- Timothy Williamson
- Timycha
- Tine Hribar
- Tiqqun
- Tirukkuṛaḷ
- Tiruvalluvar
- Tisias
- Titoism
- Titus Albucius
- Titus Brandsma
- Titus Pomponius Atticus
- To be
- Todd May
- Toegye
- Toju Nakae
- Token
- Token-type distinction
- Toleration
- Tolstoyan
- Tom Beauchamp
- Tom Gerety
- Tom Polger
- Tom Regan
- Tom Stoneham
- Tomáš Garrigue Masaryk
- Tomer Devorah
- Tommaso Campanella
- Tommaso Maria Zigliara
- Tomonobu Imamichi
- Tonghak
- Tonk
- Tõnu Trubetsky
- Tony Honoré
- Tony McWalter
- Toothpaste tube theory
- Top-down
- Top-down parsing language
- Top down
- Topical logic
- Topics (Aristotle)
- Topus Uranus
- Torbjörn Tännsjö
- Tore Nordenstam
- Torgny T:son Segerstedt
- Toronto School of communication theory
- Torquato Accetto
- Torsti Lehtinen
- Torture
- Tory corporatism
- Total ordering
- Totalism
- Totalitarian democracy
- Totalitarianism
- Tottenham Outrage
- Tout court
- Towards a Global Ethic: An Initial Declaration
- Toxin puzzle
- Trace (deconstruction)
- Trace monoid
- Trace theory
- Tractarian
- Tractatus coislinianus
- Tractatus de Intellectus Emendatione
- Tractatus Logico-Philosophicus
- Trademark argument
- Tradition
- Traditionalism
- Traditionalist conservatism
- Traditionalist School
- Traducianism
- Tragedy
- Tragedy of the commons
- Tragic Week (Catalonia)
- Trail ethics
- Trailokya
- Trairūpya
- Trait ascription bias
- Tran Duc Thao
- Transaction logic
- Transcendence (philosophy)
- Transcendence (religion)
- Transcendent theosophy
- Transcendental apperception
- Transcendental argument
- Transcendental argument for the existence of God
- Transcendental arguments
- Transcendental idealism
- Transcendental number
- Transcendental realism
- Transcendental Students
- Transcendental theology
- Transcendentalism
- Transcendentals
- Transferable utility
- Transfinite induction
- Transfinite number
- Transformation problem
- Transformation rule
- Transformational grammar
- Transformative justice
- Transhumanism
- Transitional demand
- Transitive closure
- Transitive relation
- Translating "law" to other European languages
- Translation
- Translators
- Transmigration of the soul
- Transmodernism
- Transmodernity
- Transparency (linguistic)
- Transparent Intensional Logic
- Transposition (logic)
- Transtheistic
- Transubstantiation
- Transvaluation of values
- Transworld identity
- Traugott Konstantin Oesterreich
- Treatise
- Tree of Porphyry
- Trenton Merricks
- Tresconsciousness
- Triage
- Trial of Socrates
- Trial of the thirty
- Trialism
- Trichotomy (philosophy)
- Trikaya
- Trilemma
- Trinitarianism
- Trinity
- Tripitaka
- Tripp York
- Triune Continuum Paradigm
- Trivial objections
- Trivialism
- Trolley problem
- Trope (philosophy)
- Trope of Litotes
- Troubled Sleep
- True-believer syndrome
- True name
- Truism
- Truman G. Madsen
- Trumbullplex
- Trust (social sciences)
- Trust (sociology)
- Trustworthiness
- Truth
- Truth-conditional semantics
- Truth-function
- Truth-functions
- Truth-value
- Truth-value link
- Truth-value semantics
- Truth and Method
- Truth by consensus
- Truth claim (photography)
- Truth condition
- Truth conditions
- Truth definition
- Truth function
- Truth predicate
- Truth table
- Truth theory
- Truth value
- Truthbearer
- Truthiness
- Truthlikeness
- Truthmaker
- Tsang Lap Chuen
- Tschandala
- Tsung-Mi
- Tu quoque
- Tudor Vianu
- Tuesdays with Morrie
- Tui (intellectual)
- Tuli Kupferberg
- Tullia d'Aragona
- Tung Chung-shu
- Turing degree
- Turing degrees
- Turing machine
- Turing machine equivalents
- Turing machines
- Turing reducibility
- Turing test
- Türker armaner
- Turtles all the way down
- Tusculanae Quaestiones
- Twardowski
- Twelfth Letter (Plato)
- Twelve Nidānas
- Twentieth-century French philosophy
- Twilight Club
- Twilight of the Idols
- Twin Earth thought experiment
- Two-level utilitarianism
- Two Ages: A Literary Review
- Two Concepts of Liberty
- Two Dogmas of Empiricism
- Two Treatises of Government
- Two truths doctrine
- Two wrongs make a right
- Tychism
- Tyler Burge
- Type (metaphysics)
- Type-E Dualism
- Type-identity theory
- Type-token distinction
- Type-type identity
- Type (metaphysics)
- Type identity
- Type materialism
- Type physicalism
- Type theory
- Types of Buddha
- Typification
- Tyranny of the majority
- Tzvetan Todorov
U
- U. G. Krishnamurti
- Ubasute
- Übermensch
- Ubuntu (philosophy)
- Uchiyama Gudō
- UCLA Department of Philosophy
- Udana
- Udayana
- Uddyotakara
- Udyotakara
- Ueyama Shunpei
- Ugliness
- Ugly duckling theorem
- Ugo Spirito
- Uisang
- Ûisang
- Uku Masing
- Ullin Place
- Ülo Kaevats
- Ulrich Libbrecht
- Ulrich of Strasbourg
- Ulrich of Strasburg
- Ulrik Huber
- Ultimate Boeing 747 gambit
- Ultimate fate of the universe
- Ultra-imperialism
- Ultrafinitism
- Umanità Nova
- Umberto Eco
- Umberto Eco bibliography
- Umehara Takeshi
- Unabomber for President
- Uncertainty
- Uncertainty principle
- Unconscious mind
- Unconsciousness
- Unconventional Action
- Uncountable
- Undecidable problem
- Underconsumption
- Underdetermination
- Understanding
- Understanding Consciousness
- Undistributed middle
- Undoing Gender
- Unequal exchange
- Unexpected hanging paradox
- Unhappy consciousness
- Unified science
- Unified Science
- Uniform Rights of the Terminally Ill Act
- Uniformitarianism
- Union flying squad
- Unione Sindacale Italiana
- Unique name assumption
- Uniquely Inversible Grammar
- Uniqueness quantification
- Unit-point atomism
- Unitarianism
- Unitary urbanism
- Unity in diversity
- Unity of opposites
- Unity of science
- Unity of the proposition
- Universal (metaphysics)
- Universal characteristic
- Universal class
- Universal code (ethics)
- Universal dialectic
- Universal generalization
- Universal grammar
- Universal instantiation
- Universal language
- Universal law
- Universal mind
- Universal Natural History and Theory of Heaven
- Universal pragmatics
- Universal prescriptivism
- Universal proposition
- Universal quantification
- Universal quantifier
- Universal reason
- Universal science
- Universal value
- Universalism
- Universality (philosophy)
- Universalizability
- Universals
- Universe
- Universe of discourse
- University of Constantinople
- University Philosophical Society (Trinity College, Dublin)
- Universology
- Univocity
- Unknowable
- Unknown unknown
- Unmoved mover
- Unobservable
- Unorganisation
- Unrestricted grammar
- Unsolved problems in philosophy
- Untimely Meditations (Nietzsche)
- Unweaving the Rainbow
- Up Against the Wall Motherfuckers
- Upadhi
- Upanishads
- Upaya
- Upeksa
- Urban secession
- Urbano González Serrano
- Urdoxa
- Uri Gordon
- Uriel da Costa
- Urso of Calabria
- Ursula Wolf
- Uruguayan Anarchist Federation
- Use–mention distinction
- Use of performance-enhancing drugs in sport
- Use value
- Useless rules
- User illusion
- Usury
- Utah Phillips
- Utamakura
- Utilitarian bioethics
- Utilitarianism
- Utilitarianism (book)
- Utility
- Utility function
- Utility monster
- Utopia
- Utopianism
- Utpaladeva
- Uttara Mimamsa
- Utterance
V
- V (comics)
- V for Vendetta
- V. Y. Mudimbe
- Vācaspati Miśra
- Václav Bělohradský
- Vacuous
- Vacuous truth
- Vagbhatananda Gurudevar
- Vagrant predicate
- Vagueness
- Vaisesika
- Vaiśesika
- Vaisheshika
- Val Plumwood
- Valence effect
- Valentin A. Bazhanov
- Valentin Ferdinandovich Asmus
- Valentinianism
- Valentinus (Gnostic)
- Valeriano Orobón Fernández
- Validity (logic)
- VALIS
- Vallabha Acharya
- Vallabhacharya
- Valorisation
- Value-form
- Value (ethics)
- Value added
- Value judgment
- Value of control
- Value of Earth
- Value of information
- Value of life
- Value pluralism
- Value product
- Value system
- Value theory
- Values
- Vancouver guidelines
- Vanishing mediator
- Vanity
- Vanja Sutlić
- Varadaraja V. Raman
- Varieties of democracy
- Varlam Cherkezishvili
- Vāsanā
- Vasilii Rozanov
- Vasilii Vasil'evich Rozanov
- Vasily Jakovlevich Zinger
- Vasily Nalimov
- Vasily Rozanov
- Vasubandhu
- Vatsyayana
- Vātsyāyana
- Vauvenargues
- Vazgen I
- Veda
- Vedanta
- Vedānta
- Vedas
- Vegan Outreach
- Veganarchism
- Vegetarianism
- veil of ignorance
- Veil of perception
- Venn diagram
- Vergangenheitsbewältigung
- Verification
- Verification principle
- Verification theory
- Verificationism
- Verisimilitude
- Veritatis Splendor
- Veritism
- Vernon Lee
- Verstehen
- Vianney Décarie
- Vice
- Vices
- Vicious circle
- Vicious circle principle
- Vicious regress
- Victor Basch
- Victor Cousin
- Victor d'Hupay
- Victor Dave
- Victor Kraft
- Victor Ovcharenko
- Victor Reppert
- Victor Robinson
- Victoria Camps
- Victoria Institute
- Victoria, Lady Welby
- Vienna Circle
- Views from the Real World
- Vigdis Songe-Møller
- Vijnanabhiksu
- Vijnanavada
- Vijñānavāda
- Viktor Grigoryevich Afanasyev
- Vilém Flusser
- Vilfredo Pareto
- Vilhjálmur Árnason
- Villa Amalia (Athens)
- Vincent Cespedes
- Vincent Descombes
- Vincent F. Hendricks
- Vincent Ferrer
- Vincent Miceli
- Vincenzo Gioberti
- Vincible ignorance
- Violence
- Violinist (thought experiment)
- Vipāka
- Vipassana
- Vipassanā
- Vipassana movement
- Virgil Aldrich
- Virtù
- Virtual (philosophy)
- Virtue
- Virtue epistemology
- Virtue ethics
- Virtue jurisprudence
- Virtue theory
- Virtues
- Virtuous circle
- Virtus (virtue)
- Vishishtadvaita
- Vishnu
- Vision (religion)
- Visions of Order
- Vissarion Belinsky
- Visual arts and design
- Visual ethics
- Visual literacy
- Visual modularity
- Visual reasoning
- Visual rhetoric
- Vital du Four
- Vitalism
- Vittorio Hösle
- Vittorio Vettori
- Vivekachudamani
- Vladimir Dvorniković
- Vladimir Hütt
- Vladimir Il'ich Lenin
- Vladimir Ilich Lenin
- Vladimir Ilyich Ulyanov Lenin
- Vladimir Jankélévitch
- Vladimir Lenin
- Vladimir Odoevsky
- Vladimir Solovyov (philosopher)
- Void (Śūnyatā)
- Voidism
- Vojin Rakic
- Volcano School
- Volin
- Volition
- Volker Zotz
- Voltaire
- Voltairine de Cleyre
- Voluntarism
- Voluntarism (metaphysics)
- Voluntarism (theology)
- Voluntary active euthanasia
- Voluntary compliance
- Voluntary euthanasia
- Voluntary Socialism
- Voluntaryism
- Von Restorff effect
- Voodoo science
- Voting paradox
- Vulnerability
- Vyacheslav Ivanov
- Vyasa
- Vyasatirtha
- Vydūnas
W
- W. B. Gallie
- W. D. Ross
- W. E. Johnson
- W. Hugh Woodin
- W. K. C. Guthrie
- W.D. Ross
- W.E. Johnson
- Wabi-sabi
- Wacker von Wackenfels
- Wage labour
- Wage slavery
- Wagnerism
- Waiting for Godot
- Waking Life
- Walda Heywat
- Walden
- Walking Stewart
- Walpola Rahula
- Walsall Anarchists
- Walter Benjamin
- Walter Berns
- Walter Burley
- Walter Charleton
- Walter Chatton
- Walter Dubislav
- Walter Ehrlich
- Walter Goodnow Everett
- Walter J. Ong
- Walter Kaufmann (philosopher)
- Walter of Bruges
- Walter of Mortagne
- Walter of St Victor
- Walter of Winterburn
- Walter Pater
- Walter Pitts
- Walter S. Gamertsfelder
- Walter Schulz (philosopher)
- Walter Terence Stace
- Wang Bi
- Wang Ch'ung
- Wang Chong
- Wang Chuanshan
- Wang Fu-chih
- Wang Fu (philosopher)
- Wang Fuzhi
- Wang Ruoshui
- Wang Yang-ming
- Wang Yangming
- War and peace
- War and Peace
- War and philosophy
- War in the Age of Intelligent Machines
- War of all against all
- War of Anti-Christ with the Church and Christian Civilization
- Ward Jones
- Warren Ashby
- Warren Buffett
- Warren Goldfarb
- Warren Shibles
- Warwick Fox
- Watchmaker analogy
- Waterland (novel)
- Watsuji Tetsuro
- Watsuji Tetsurō
- Wawrzyniec Grzymała Goślicki
- Waynflete Professorship
- We the Living
- We will bury you
- Weak agnosticism
- Weak law of large numbers
- Weak ontology
- Weakness of will
- Weber–Fechner law
- Wei Wu Wei
- Weighted context-free grammar
- Welfare (financial aid)
- Welfare economics
- Welfare liberalism
- Welfarism
- Well-being
- Well-formed formula
- Well-founded phenomenon
- Well-ordered set
- Well ordered set
- Well ordering
- Well travelled road effect
- Weltanschauung
- Wen-tzu
- Wendell Berry
- Wenzi
- Werner Erhard (book)
- Werner Hamacher
- Werner Heisenberg
- Wesley C. Salmon
- Wesley Newcomb Hohfeld
- Wesley Salmon
- Wesleyan Philosophical Society
- Western Cape Anti-Eviction Campaign
- Western painting
- Western philosophy
- Wetware (brain)
- Wff
- What Computers Can't Do
- What I Believe
- What Is Art?
- What Is Literature?
- What Is Property?
- What Is This Thing Called Science?
- What Is Your Dangerous Idea?
- What should then be done O people of the East
- What the Tortoise Said to Achilles
- What We Believe But Cannot Prove
- Wheel of life
- When a white horse is not a horse
- Where Mathematics Comes From
- Whistleblower
- White's Professor of Moral Philosophy
- Whiteway Colony
- Whitny Braun
- Why I Am Not a Christian
- Why Truth Matters
- Widow's Walk (novel)
- Wiener Moderne
- Wilbur Marshall Urban
- Wild law
- Wildness
- Wilfrid Desan
- Wilfrid Sellars
- Wilfrid Stalker Sellars
- Wilhelm Dilthey
- Wilhelm Gottlieb Tennemann
- Wilhelm Heinrich Wackenroder
- Wilhelm Homberg
- Wilhelm Jerusalem
- Wilhelm Maximilien Wundt
- Wilhelm Ostwald
- Wilhelm Reich
- Wilhelm Schuppe
- Wilhelm Traugott Krug
- Wilhelm von Humboldt
- Wilhelm Windelband
- Wilhelm Wundt
- Will (philosophy)
- Will Durant
- Will Kymlicka
- Will to believe doctrine
- Will to live
- Will to power
- Willard Van Orman Quine
- Willem B. Drees
- William A. Earle
- William Alston
- William Alvin Howard
- William Angus Knight
- William Barrett (philosopher)
- William Bechtel
- William Blackstone
- William Buwalda
- William C. Dowling
- William C. Wimsatt
- William Calvert Kneale
- William Chillingworth
- William Chittick
- William Cleghorn
- William Craig (philosopher)
- William Crathorn
- William David Ross
- William de la Mare
- William Desmond (philosopher)
- William Drummond of Logiealmond
- William Duncan (philosopher)
- William E. Connolly
- William E. Kaufman
- William Ernest Hocking
- William Ernest Johnson
- William F. Vallicella
- William Fontaine
- William Frankena
- William G. Lycan
- William Galston
- William Godwin
- William Graham Sumner
- William Hamilton
- William Hare (philosopher)
- William Hatcher Davis
- William Herbert Dray
- William Heytesbury
- William Hirstein
- William Irwin (philosopher)
- William Irwin Thompson
- William J. Richardson
- William James
- William James Lectures
- William K. Frankena
- William Kingdon Clifford
- William Kneale
- William Kurtz Wimsatt, Jr.
- William L. Reese
- William L. Rowe
- William Lane Craig
- William Law
- William Lawvere
- William Lee Bradley
- William Lowe Bryan
- William Lycan
- William Mackintire Salter
- William Manderstown
- William McDougall
- William McDougall (psychologist)
- William McNeill (philosopher)
- William Mitchell (philosopher)
- William Newton-Smith
- William Occam
- William Ockham
- William of Alnwick
- William of Auvergne (bishop)
- William of Auvergne, Bishop of Paris
- William of Auxerre
- William of Champeaux
- William of Conches
- William of Falgar
- William of Heytesbury
- William of Lucca
- William of Moerbeke
- William of Ockham
- William of Saint-Amour
- William of Sherwood
- William of Ware
- William Paley
- William Pepperell Montague
- William Ralph Inge
- William Ritchie Sorley
- William S. Hatcher
- William S. Sahakian
- William Shaw (philosopher)
- William Stanley Jevons
- William Stoddart
- William Sweet
- William Temple (archbishop)
- William Temple (logician)
- William Thompson (Cork)
- William Thompson (philosopher)
- William Torrey Harris
- William W. Tait
- William Wallace (Scottish philosopher)
- William Warren Bartley
- William Whewell
- William Wollaston
- Wincenty Lutosławski
- Wirth–Weber precedence relationship
- Wirth syntax notation
- Wisdom
- Wisdom of repugnance
- Wise old man
- Wishful thinking
- Wissenschaftslehre
- Witelo
- Witness argument
- Wittgenstein's Beetle (and other classic thought experiments)
- Wittgenstein's Mistress
- Wittgenstein's Poker: The Story of a Ten-Minute Argument Between Two Great Philosophers
- Wittgenstein (film)
- Wittgenstein on Rules and Private Language
- Władysław Heinrich
- Władysław Mieczysław Kozłowski
- Władysław Tatarkiewicz
- Władysław Weryho
- Wolfgang Fritz Haug
- Wolfgang Harich
- Wolfgang Kohler
- Wolfgang Köhler
- Wolfgang Smith
- Wolfgang Stegmüller
- Wolfi Landstreicher
- Womb Realm
- WOMBLES
- Women and children first (protocol)
- Women in philosophy
- Won Gwang
- Wonch'uk
- Wonchuk
- Wonderism
- Wonhyo
- Wōnhyo
- Woo Tsin-hang
- Wooden iron
- Word and Object
- Word problem (computability)
- Word sense
- Work ethic
- Work of art
- Workerism
- Workers' control
- Workers' Initiative
- Workers Solidarity
- Workers Solidarity Alliance
- Working hypothesis
- Works
- Works by Thomas Aquinas
- Works of Love
- Works of Madhvacharya
- World-soul
- World (philosophy)
- World communism
- World Congress of Philosophy
- World disclosure
- World Hypotheses
- World riddle
- World Trade Organization Ministerial Conference of 1999 protest activity
- World view
- Worldcentrism
- Worldline
- Worldview
- Worse-than-average effect
- Writing Sampler
- Writings of Marcus Tullius Cicero
- Wrong
- Wrong direction
- Wronger than wrong
- Wú (negative)
- Wu Enyu
- Wu Qi
- Wu wei
- Wuji (philosophy)
- Wuzhen pian
X
Y
- Yaaqūb ibn Ishāq al-Kindī
- Yabo
- Yajnavalkya
- Yale school (deconstruction)
- Yamaga Sokō
- Yamazaki Ansai
- Yang
- Yang Chu
- Yang Rongguo
- Yang Xiong (author)
- Yang Zhu
- Yaron Brook
- Yasovijaya
- Ye Shi
- Yehoshua Bar-Hillel
- Yehouda Shenhav
- Yen Yuan
- Yeshayahu Leibowitz
- Yi Ching
- Yi Hwang
- Yi I
- Yi Saek
- Yi Xing
- Yi Yulgok
- Yiannis N. Moschovakis
- Yiannis Psychopedis
- Yijing
- Yin and yang
- Yoga
- Yogacara
- Yogācāra Buddhism
- Yogi Berra
- Yohanan Alemanno
- Yoichiro Murakami
- Yong
- Yongjia School
- Yorkshire Philosophical Society
- You're either with us, or against us
- Young Hegelians
- Youssef Seddik (philosopher)
- Yuga
- Yumo Mikyo Dorje
- Yunmen Wenyan
- Yuquan Shenxiu
- Yuri Matiyasevich
- Yusuf Balasaghuni
- Yves Brunsvick
- Yves Simon (philosopher)
Z
- Zabalaza Anarchist Communist Federation
- Zadig
- Zaki Naguib Mahmoud
- Zapatista Army of National Liberation
- Zarathustra's roundelay
- Zarathustra (fictional philosopher)
- Zaum
- ZC
- Zdeněk Neubauer
- Zeami Motokiyo
- Zeigarnik effect
- Zeitgeist
- Zen
- Zen and the Art of Motorcycle Maintenance
- Zen and the Brain
- Zenarchy
- Zengcius
- Zengzi
- Zeno's paradoxes
- Zeno of Citium
- Zeno of Elea
- Zeno of Sidon
- Zeno of Tarsus
- Zeno Vendler
- Zenobius
- Zenodotus (philosopher)
- Zenon Pylyshyn
- Zera Yacob
- Zermelo–Fraenkel set theory
- Zero-risk bias
- Zero-sum
- Zeroth-order logic
- ZF
- ZFC
- Zhan Ruoshui
- Zhang Dongsun
- Zhang Guoxiang
- Zhang Heng
- Zhang Zai
- Zhao Tingyang
- Zhe school (painting)
- Zheng Xuan
- Zhenren
- Zhentong
- Zhi
- Zhi Dun
- Zhiyi
- Zhongyong
- Zhou Dunyi
- Zhou Guoping
- Zhu Qianzhi
- Zhu Xi
- Zhu Xueqin
- Zhuangzi
- Zhuangzi (book)
- Zi Chan
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