Index of philosophy articles (R–Z)
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R
- R. B. Braithwaite
- R. De Staningtona
- R. Edward Freeman
- R. G. Collingwood
- R. James Long
- R. Jay Wallace
- R. M. Hare
- R. R. Rockingham Gill
- Rabbinic law
- Rabia al-Adawiyya
- Rabindranath Tagore
- Rabirius (Epicurean)
- Race (classification of human beings)
- Race to the bottom
- Rachel Elior
- Rachida Triki
- Racialism (Racial categorization)
- Racism
- Rada Iveković
- Radical Aristotelianism
- Radical behaviorism
- Radical behaviourism
- Radical democracy
- Radical empiricism
- Radical Evolution
- Radical feminism
- Radical interpretation
- Radical Philosophy
- Radical Philosophy Review
- Radical skepticism
- Radical translation
- Radical Unintelligibility
- Radio libertaire
- Rado Riha
- Radovan Richta
- Radulfus Ardens
- Radulphus Brito
- Raegan Butcher
- Rafael Calvo Serer
- Rafe Champion
- Raghavan N. Iyer
- Raghunatha Siromani
- Rahbani brothers
- Raili Kauppi
- Raimo Tuomela
- Raimond Gaita
- Raimundo Teixeira Mendes
- Rainer Forst
- Rainer Maria Rilke
- Raïssa Maritain
- Raja Yoga
- Rajas
- Ralph Barton Perry
- Ralph Cudworth
- Ralph Johnson (philosopher)
- Ralph of Longchamp
- Ralph Strode
- Ralph Tyler Flewelling
- Ralph Waldo Emerson
- Ralstonism
- Ramanuja
- Ramchandra Gandhi
- Rameau's Nephew
- Ramification problem
- Ramified type theory
- Ramin Jahanbegloo
- Ramism
- Ramist movement
- Ramón José Sender Garcés
- Ramon Llull
- Ramon Vila Capdevila
- Ramón Xirau
- Ramsey–Lewis method
- Ramsey Kanaan
- Randal Marlin
- Randall Auxier
- Randall Swingler
- Randian hero
- Random act of kindness
- Randomness
- Range of a function
- Ranjana Khanna
- Raoul Vaneigem
- Raphaël Enthoven
- Raphael M. Robinson
- Raphael von Koeber
- Rasa (aesthetics)
- Rate of exploitation
- Rate of profit
- Ratio (journal)
- Ratio scale
- Ratiocination
- Rational agent
- Rational animal
- Rational choice theory
- Rational consequence relation
- Rational egoism
- Rational fideism
- Rational ignorance
- Rational love
- Rational mysticism
- Rational number
- Rational reconstruction
- Rational Response Squad
- Rationalism
- Rationality
- Rationalization
- Rationalization (psychology)
- Ratnatraya
- Ravachol
- Raven paradox
- Raw feels
- Ray Brassier
- Ray Jackendoff
- Ray Monk
- Raymond Aron
- Raymond Duncan
- Raymond Geuss
- Raymond Klibansky
- Raymond Polin
- Raymond Ruyer
- Raymond Smullyan
- Raymond Tallis
- Razor (philosophy)
- Reaction
- Reactionary
- Reading Capital
- Real
- Real atheism
- Real freedom
- Real number
- Real self
- Real socialism
- Realism
- Realism in international relations
- Reality
- Reality enforcement
- Reality in Buddhism
- Reality principle
- Reality tunnel
- Realizability
- Realization
- Really Really Free Market
- Realphilosophie
- Reason
- Reason (argument)
- Reason (logic)
- Reason and Revolution
- Reasonable doubt
- Reasoning
- Reasons and Persons
- Reasons externalism
- Reasons internalism
- Rebecca Goldstein
- Rebirth
- Rebirth (Buddhism)
- Recall bias
- Received view
- Received view of theories
- Recherches husserliennes
- Rechtsstaat
- Recipes for Disaster
- Reciprocal altruism
- Reciprocity
- Reciprocity (social and political philosophy)
- Recognition
- Recognizable language
- Reconstructivism
- Rectification of Names
- Recuperation (sociology)
- Recurrence
- Recursion
- Recursive function
- Recursive function theory
- Recursive language
- Recursively enumerable language
- Red and Anarchist Skinheads
- Red Emma's Bookstore Coffeehouse
- Redintegration
- Redistribution
- Redpill
- Reduct
- Reductio ad absurdum
- Reductio ad Hitlerum
- Reduction (philosophy)
- Reductionism
- Redundancy (language)
- Redundancy theory of truth
- Reed–Muller expansion
- Reference
- Referential
- Referential opacity
- Referential transparency
- Referentially transparent
- Reflection principles
- Reflections on the Revolution in France
- Reflective disclosure
- Reflective equilibrium
- Reflectivism
- Reflexive
- Reflexive monism
- Reflexivity
- Reform
- Reform Judaism
- Reformational philosophy
- Reformed epistemology
- Reformism
- Refusal of work
- Regeneración
- Reginald Garrigou-Lagrange
- Reginald Hackforth
- Reginald Ray
- Regionalism (art)
- Regress
- Regress argument
- Regression analysis
- Regression fallacy
- Regular grammar
- Regular language
- Regular modal logic
- Regular tree grammar
- Regulation of science
- Regulative principle
- Regulative principles
- Reification (fallacy)
- Reification (Marxism)
- Reincarnation
- Reinhart Maurer
- Reinhold Niebuhr
- Reism
- Relation
- Relation of Ideas
- Relational quantum mechanics
- Relational semantics
- Relational space
- Relational theory
- Relationalism
- Relations of production
- Relationship between Friedrich Nietzsche and Max Stirner
- Relationship between religion and science
- Relationship ethics
- Relative value
- Relativism
- Relativist fallacy
- Relativity of knowledge
- Relativity of simultaneity
- Relativity theory
- Relevance
- Relevance logic
- Relevance theory
- Relevant alternatives theory
- Reliabilism
- Religio Medici
- Religion
- Religion & Ethics Newsweekly
- Religion and abortion
- Religion and agriculture
- Religion and happiness
- Religion and science
- Religion of Humanity
- Religion within the Bounds of Bare Reason
- Religious belief
- Religious communism
- Religious democracy
- Religious experience
- Religious humanism
- Religious intellectualism in Iran
- Religious interpretation
- Religious interpretations of the Big Bang theory
- Religious language
- Religious law
- Religious liberalism
- Religious naturalism
- Religious philosophy
- Religious pluralism
- Religious skepticism
- Religious views on business ethics
- Religious views on suicide
- Rémi Brague
- Remigius of Auxerre
- Reminiscence
- Remo Bodei
- Remorse
- Ren Jiyu
- Renaissance
- Renaissance humanism
- Renaissance philosophy
- Renate Holub
- Renato Janine Ribeiro
- René Descartes
- René Girard
- René Guénon
- Rene Guenon: A Teacher for Modern Times
- René Viénet
- Renewing the Anarchist Tradition
- Renn Dickson Hampden
- Rentier capitalism
- Renzo Novatore
- Repertorium der Nederlandse Wijsbegeerte
- Repetition (Kierkegaard)
- Representation (arts)
- Representation (psychology)
- Representation theorem
- Representational theory of mind
- Representationalism
- Representative democracy
- Representative realism
- Repressive hypothesis
- Reprobation
- Reproducibility
- Reproduction (economics)
- Reproductive technology
- Reprogenetics
- Republican democracy
- Republicanism
- Res Cogitans
- Res Extensa
- Research ethics
- Resentment
- Resistentialism
- Resolution (logic)
- Resources for clinical ethics consultation
- Respect
- Respondent conditioning
- Response bias
- Response variable
- Ressentiment
- Restorative justice
- Resurrection
- Retention and protention
- Reterritorialization
- Rethinking "Gnosticism": An Argument for Dismantling a Dubious Category
- Retributive justice
- Retributivism
- Retrocausality
- Retrocausation
- Retroduction
- Retrospective determinism
- Revealed truth
- Revelation
- Revenge
- Reverence for Life
- Reverse Turing test
- Review of Metaphysics
- Review of Philosophy and Psychology
- Revisionism (Marxism)
- Revista Ideas y Valores
- Revolt
- Revolt Against the Modern World
- Revolution
- Revolutionary Anarchist Bowling League
- Revolutionary Insurrectionary Army of Ukraine
- Revolutionary integrationism
- Revolutionary spontaneity
- Revolutions in Mathematics
- Revue de métaphysique et de morale
- Revue de synthèse
- Revue philosophique de la France et de l'étranger
- Revue Philosophique de Louvain
- Rewriting
- Rhazes
- Rhetoric
- Rhetoric (Aristotle)
- Rhetoric of science
- Rhetoric of social intervention model
- Rhetoric to Alexander
- Rhetorical criticism
- Rhetorical reason
- Rhizome (philosophy)
- Rhyme
- Rhythmanalysis
- Ricardo Rozzi
- Richard's paradox
- Richard-Bevan Braithwaite
- Richard A. Macksey
- Richard Alan Cross
- Richard Arneson
- Richard Avenarius
- Richard Bach
- Richard Baron (philosopher)
- Richard Bentley
- Richard Boyd
- Richard Brandt
- Richard Brinkley
- Richard Burthogge
- Richard Carrier
- Richard Cumberland (philosopher)
- Richard Dawkins
- Richard Dedekind
- Richard E. Flathman
- Richard Ferrybridge
- Richard Grathoff
- Richard Gregg (social philosopher)
- Richard Haldane, 1st Viscount Haldane
- Richard Hanley
- Richard Hönigswald
- Richard Hooker
- Richard Ithamar Aaron
- Richard J. Bernstein
- Richard J. F. Day
- Richard Jeffrey
- Richard Kearney
- Richard Kilvington
- Richard Kirkham
- Richard Kroner
- Richard Lewis Nettleship
- Richard M. Weaver
- Richard McKeon
- Richard Meltzer
- Richard Merett Montague
- Richard Mervyn Hare
- Richard Milton Martin
- Richard Montague
- Richard of Campsall
- Richard of Cornwall
- Richard of Middleton
- Richard of Saint Victor
- Richard of St Victor
- Richard Overton
- Richard Payne Knight
- Richard Popkin
- Richard Price
- Richard Rorty
- Richard Rudolf Walzer
- Richard Rufus
- Richard Rufus of Cornwall
- Richard Sault
- Richard Schacht
- Richard Shusterman
- Richard Sorabji
- Richard Swinburne
- Richard Swineshead
- Richard Sylvan
- Richard Tarnas
- Richard Clyde Taylor
- Richard the Sophister
- Richard Thomas Nolan
- Richard von Mises
- Richard von Schubert-Soldern
- Richard W. Miller
- Richard Wahle
- Richard Walker (philosopher)
- Richard Whately
- Richard Wolin
- Richard Wollheim
- Richards controller
- Rick Lewis (journalist)
- Rick Turner (philosopher)
- Ride the Tiger
- Rieko
- Rifa'a el-Tahtawi
- Right-libertarianism
- Right action
- Right Hegelians
- Right of revolution
- Right quotient
- Right to exist
- Righteousness
- Rights
- Rights Ethics
- Rights of Englishmen
- Rights of Man
- Rights of the Terminally Ill Act 1995
- Rigid designator
- Rigorism
- Rigour
- Rigpa
- Rinchen Zangpo
- Ring of Gyges
- Rising Tide North America
- Risk
- Risk assessment
- Ritual
- Ritual purification
- Rival Lovers
- Rıza Tevfik Bölükbaşı
- RNC 8
- RNC Welcoming Committee
- Road to Freedom (journal)
- Robbins algebra
- Robert A. McDermott
- Robert Adamson (philosopher)
- Robert Alexy
- Robert Allinson
- Robert Alyngton
- Robert Arrington
- Robert Audi
- Robert B. Pippin
- Robert Balfour (philosopher)
- Robert Bernasconi
- Robert Boyle
- Robert Brandom
- Robert Bruce Raup
- Robert C. Solomon
- Robert C. Stalnaker
- Robert Cowton
- Robert Cummings Neville
- Robert F. Almeder
- Robert Feys
- Robert Filmer
- Robert Flint (theologian)
- Robert Fludd
- Robert Frodeman
- Robert Graham (historian)
- Robert Grosseteste
- Robert Grudin
- Robert Holcot
- Robert Holkot
- Robert J. Zydenbos
- Robert Joseph Pothier
- Robert Kane (philosopher)
- Robert Kilwardby
- Robert Kirk
- Robert Kowalski
- Robert L. Holmes
- Robert Lawson Vaught
- Robert Leslie Ellis
- Robert M. Pirsig
- Robert M. Solovay
- Robert Magliola
- Robert Maximilian de Gaynesford
- Robert Merrihew Adams
- Robert Nozick
- Robert of Melun
- Robert P. Crease
- Robert P. George
- Robert Paul Wolff
- Robert Pullus
- Robert Redeker
- Robert Rowland Smith
- Robert S. Boyer
- Robert S. Corrington
- Robert S. Hartman
- Robert Saitschick
- Robert Spaemann
- Robert Stalnaker
- Robert T. Pennock
- Robert Todd Carroll
- Robert Trundle
- Robert Vischer
- Robert von Zimmermann
- Robert Wardy
- Roberto Ardigò
- Roberto Carifi
- Roberto Mangabeira Unger
- Roberto Refinetti
- Roberto Torretti
- Robin Attfield
- Robin Collins
- Robin Gandy
- Robin Hahnel
- Robin LePoidevin
- Roboethics
- Robot
- Rod Coronado
- Rod L. Evans
- Roderick Chisholm
- Rodolfo Mondolfo
- Rodolphe Gasché
- Rodolphus Agricola
- Roger-Pol Droit
- Roger Bacon
- Roger Caillois
- Roger de Piles
- Roger Fry
- Roger Garaudy
- Roger Joseph Boscovich
- Roger Marston
- Roger North (17th century)
- Roger Penrose
- Roger Scruton
- Rogerian argument
- Rogers Albritton
- Rói Patursson
- Roland Barthes
- Roland Fraïssé
- Roland of Cremona
- Rolf Sattler
- Rolf Schock
- Rolf Schock Prizes
- Rolling Thunder (journal)
- Roman Ingarden
- Roman law
- Roman philosophy
- Roman Witold Ingarden
- Romanas Plečkaitis
- Romanian philosophy
- Romantic realism
- Romanticism
- Ron McClamrock
- Ronald de Sousa
- Ronald Dworkin
- Ronald Giere
- Ronald Jensen
- Ronald Loui
- Ronald M. Dworkin
- Ronald Paulson
- Root cause
- Rosa Luxemburg
- Rosalind Hursthouse
- Roscelin de Compiegne
- Roscellinus
- Roscoe Pound
- Rose Pesotta
- Rose Rand
- Rosminians
- Ross Winn
- Rota Fortunae
- Rotation method
- Round square copula
- Routledge Encyclopedia of Philosophy
- Roy Bhaskar
- Roy Wood Sellars
- Royal Institute of Philosophy
- Rüdiger Safranski
- Rudolf Arnheim
- Rudolf Bultmann
- Rudolf Carnap
- Rudolf Christoph Eucken
- Rudolf Haym
- Rudolf Hermann
- Rudolf Lingens
- Rudolf Maria Holzapfel
- Rudolf Otto
- Rudolf Rocker
- Rudolf Schottlaender
- Rudolf Seydel
- Rudolf Steiner
- Rudolf von Jhering
- Rudolph Göckel
- Rudolph Goclenius
- Rudolphus Goclenius
- Rufus Jones (writer)
- Ruhollah Khomeini
- Rule by decree
- Rule egoism
- Rule of inference
- Rule of law
- Rule of Recognition
- Rule of Rescue
- Rule of Three (Wiccan)
- Rule utilitarianism
- Rules for the Direction of the Mind
- Rules of passage (logic)
- Ruling class
- Rune Slagstad
- Rupert Read
- Rush Rhees
- Rushworth Kidder
- Russ Shafer-Landau
- Russell's paradox
- Russell's teapot
- Russell Kirk
- Russian cosmism
- Russian formalism
- Russian philosophy
- Ruth Abbey
- Ruth Barcan Marcus
- Ruth Macklin
- Ruth Millikan
- Ruth Nanda Anshen
- Ryle's regress
- Ryosen Tsunashima
S
- S. Barry Cooper
- S. Morris Engel
- S5 (modal logic)
- Saadiah Gaon
- Sacco and Vanzetti
- Sacco and Vanzetti (2006 film)
- Sacco e Vanzetti (1971 film)
- Sacraments
- Sacred
- Sacrifice
- Sadaqah
- Sadayoshi Fukuda
- Sadiq Jalal al-Azm
- Sadr al-Din al-Qunawi
- Sadr al-Din Muhammad al-Shirazi
- Sadvipras
- Safety
- Sage (Sophos)
- Saggi sull'idealismo magico
- Saguna brahman
- Sahotra Sarkar
- Sail Mohamed
- Saint-Simonism
- Saint Genet
- Saint Petersburg paradox
- Saint Teresa of Avila
- Saints and Revolutionaries
- Sakadagami
- Sakae Osugi
- Saktism
- Śālikanātha
- Sallustius of Emesa
- Salomon Maimon
- Salon Mazal
- Salva veritate
- Salvador Seguí
- Salvation
- Sam Dolgoff
- Sam Gillespie
- Sam Harris (author)
- Sam Keen
- Sam Mainwaring
- Samādhi
- Samaritan's dilemma
- Samatha
- Samayasāra
- Sambhogakāya
- Sami Nair
- Adi Shankara
- Samkhya
- Samkhyakarika
- Samkhyapravachana Sutra
- Sampling bias
- Samsara
- Saṃsāra (Buddhism)
- Samsara (Jainism)
- Samuel Alexander
- Samuel Bailey
- Samuel Bowles (economist)
- Samuel Butler (novelist)
- Samuel Cabanchik
- Samuel Clarke
- Samuel de Sorbiere
- Samuel Guttenplan
- Samuel ibn Seneh Zarza
- Samuel Johnson
- Samuel Johnson's religious views
- Samuel Johnson (1649–1703)
- Samuel Johnson (pamphleteer)
- Samuel Maximilian Rieser
- Samuel Pufendorf
- Samuel Ramos
- Samuel Taylor Coleridge
- Samuel Todes
- Samuel von Pufendorf
- Samvriti
- San Diego Free Speech Fight
- Sandhi
- Sandie Lindsay, 1st Baron Lindsay of Birker
- Sandra Bartky
- Sandra Harding
- Sandra Laugier
- Sandra Mitchell
- Saneatsu Mushanokōji
- Sanjaya Belatthaputta
- Sankhara
- Sankhya
- Sanlun
- Sansara
- Śāntarakṣita
- Sante Geronimo Caserio
- Sapere aude
- Sapir–Whorf hypothesis
- Sarah Coakley
- Sarah Kofman
- Sarane Alexandrian
- Sarvepalli Radhakrishnan
- Sarye pyeollam
- Sascha Scatter
- Sascha Schapiro
- Sat (Sanskrit)
- Satchitananda
- Sathya Sai Baba
- Satisfiability and validity
- Satisfiable
- Satisfice
- Satisficing
- Satori
- Saturday Club (Boston, Massachusetts)
- Satya
- Satyagraha
- Satyrus the Peripatetic
- Saul Aaron Kripke
- Saul Yanovsky
- Sautrāntika
- Saving the Appearances: A Study in Idolatry
- Savior sibling
- Sayyid al-Qimni
- Sayyid Qutb
- Scalar implicature
- Scandal (theology)
- Scarlat Callimachi
- Scepticism
- Scepticism and Animal Faith
- Sceptics
- Schadenfreude
- Schema (Kant)
- Scheme (linguistics)
- Schizoanalysis
- Scholarch
- Scholastic method
- Scholasticism
- School for Ethics and Global Leadership
- School of Brentano
- School of Names
- School of Saint Victor
- School of Salamanca
- School of thought
- Schopenhauer's criticism of Kant's schemata
- Schopenhauer's criticism of the Kantian philosophy
- Schopenhauer's criticism of the proofs of the parallel postulate
- Schröder–Bernstein theorem
- Schrödinger equation
- Science
- Science and Christian Belief
- Science and religion
- Science of Logic
- Science of man
- Scientific communism
- Scientific determinism
- Scientific essentialism
- Scientific explanation
- Scientific instruments
- Scientific knowledge
- Scientific law
- Scientific method
- Scientific misconduct
- Scientific modelling
- Scientific progress
- Scientific realism
- Scientific Revolution
- Scientific theories
- Scientific theory
- Scientism
- Scientistic materialism
- Scientists for Global Responsibility
- SCIgen
- Scotism
- Scott Buchanan
- Scott Soames
- Scottish common sense philosophy
- Scottish school of common sense
- Scudder Klyce
- Scythianus
- Sea battle
- Search for a Method
- Sebastián Fox Morcillo
- Sebastian Miczyński
- Sebastian Petrycy
- Sebastian Shaumyan
- Sebastiano Maffettone
- Sébastien Faure Century
- Second-order logic
- Second-order predicate
- Second Alcibiades
- Second law of thermodynamics
- Second Letter (Plato)
- Second scholasticism
- Secondary antisemitism
- Secondary qualities
- Secondness
- Sectarian democracy
- Secular ethics
- Secular humanism
- Secular saint
- Secular theology
- Secularism
- Secularism in the Middle East
- Secularization
- Secundum quid
- Secundus the Silent
- Security culture
- Sediq Afghan
- Seeing
- Sefer ha-Ikkarim
- Sefer ha-Qabbalah
- Segundo Blanco
- Seiichi Hatano
- Selection
- Selective perception
- Self-awareness
- Self-compassion
- Self-concept
- Self-consciousness
- Self-control
- Self-deception
- Self-defeating prophecy
- 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
- Self-respect
- Self-serving bias
- Self (philosophy)
- Self control
- Selfishness
- Semantic consequence
- Semantic externalism
- Semantic holism
- Semantic paradox
- Semantic primes
- Semantic tableaux
- Semantic theory of truth
- Semantic view of theories
- Semantics
- Semantics encoding
- Semen Liudvigovich Frank
- Semi-Thue system
- Semiautomaton
- Semiosis
- Semiotic
- Semiotics
- Seneca's Consolations
- Seneca the Younger
- Seng-chao
- Sengzhao
- Seniority
- Sensationalism
- Sense
- Sense-data
- Sense and reference
- Sense and Sensibilia (Aristotle)
- Sense and Sensibilia (Austin)
- Sense data
- Sense of agency
- Sensibility
- Sensorium
- Sensualism
- Sensus communis
- Sentence (linguistics)
- Sentences
- Sentential calculus
- Sentential connective
- Sentential function
- Sentience
- Feeling
- Sentimental poetry
- Sentimentalism (philosophy)
- Senya Fleshin
- Seo Gyeong-deok
- Seosan
- Sequent calculus
- Sequential logic
- Serge Moscovici
- Sergei Adian
- Sergei Bulgakov
- Sergei Nikolaevich Trubetskoy
- Sergio Panunzio
- Serial position effect
- Set-theoretic reflection principles
- Set (mathematics)
- Set theory
- Seth Benardete
- Seth Material
- Seven deadly sins
- Seven Factors of Enlightenment
- Seven Life Lessons of Chaos
- Seven Sages of Greece
- Seven Sins of Medicine
- Seven virtues
- Seven Worthies of the Bamboo Grove
- Seventeen Rules of Enjuin
- Seventh Letter (Plato)
- Sex and Character
- Sex, Ecology, Spirituality
- Sexism
- Sextus Empiricus
- Sextus of Chaeronea
- Sexual attraction
- Sexual ethics
- Sexual harassment
- Sexual morality
- Seyla Benhabib
- Shabda
- Shadworth Holloway Hodgson
- Shahab al-Din Suhrawardi
- Shakespeare's Politics (book)
- Shakti
- Shalva Nutsubidze
- Shamanism
- Shame
- Shang Yang
- Shangdi
- Shankara (philosopher)
- Shannon's expansion
- Shannon Bell
- Shantideva
- Shao Yong
- Sharia
- Sharps waste
- Sharyn Clough
- Shastrartha
- Shaun Gallagher (philosopher)
- Shaun Nichols
- Sheffer stroke
- Shelly Kagan
- Shem-Tov ibn Falaquera
- Shem Mishmuel
- Shemariah of Negropont
- Shen (Chinese religion)
- Shen Buhai
- Shen Dao
- Shen Kuo
- Shen Pu-hai
- Shenhui
- Sherman Austin
- Sherrilyn Roush
- Sherry L. Ackerman
- Sherwin Wine
- Shibui
- Shihab al-Din Yahya al-Suhrawardi
- Shihab al-Din Yahya Sohravardi
- Shin'ichi Hisamatsu
- Shin hanga
- Shinran
- Shinto
- Ship of state
- Ship of Theseus
- Shiva
- Shizuteru Ueda
- Shmuel Alexandrov
- Shoshin
- Shriek
- Shu Han
- Shunsuke Tsurumi
- Shunyata
- Shūsui Kōtoku
- Siddhanta
- Siddhartha Gautama
- Sidney Hook
- Sidney Morgenbesser
- Siegfried Kracauer
- Sienese School
- Siger of Brabant
- Sigmund Freud
- Sign
- Sign (semiotics)
- Significant other
- Sign (semiotics)
- Sikh art and culture
- Sikh philosophy
- Silhak
- Silver machine
- Silver Rule
- Silvio Ceccato
- Simeon ben Zemah Duran
- Simion Bărnuţiu
- Simmias of Syracuse
- Simmias of Thebes
- Simon Blackburn
- Simon Critchley
- Simon Foucher
- Simon of Faversham
- Simon of Tournai
- Simon Oosterman
- Simon Soloveychik
- Simon the Shoemaker
- Simone de Beauvoir
- Simone Porzio
- Simone Weil
- Simple (philosophy)
- Simple commodity production
- Simplicity
- Simplicius of Cilicia
- Simpson's paradox
- Simulacra and Simulation
- Simulacrum
- Simulated reality
- Simulation hypothesis
- Simulator
- Simulism
- Simultaneity
- Sin
- Sincerity
- Sincerity and Authenticity
- Sine qua non
- Singleton set
- Singular term
- Sinn
- Sinsign
- Sir Isaac Newton
- Sir Leslie Stephen
- Sir Robert Filmer
- Sir Thomas More
- Sir William Hamilton, 9th Baronet
- Sirhak
- Siro the Epicurean
- Sissela Bok
- Sisyphus (dialogue)
- Sittlichkeit
- Situated ethics
- Situation ethics
- Situation semantics
- Situation theory
- Situational ethics
- Situationist International
- Situationist Times
- Six Myths about the Good Life
- Skandha
- Skeptic
- Skeptical hypothesis
- Skepticism
- Skeptics
- Sketch for a Theory of the Emotions
- Skolem's paradox
- Skolem–Löwenheim theorem
- Skolem normal form
- Skolem paradox
- Slaughterhouse-Five
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T
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- Table of Opposites
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- The Simpsons and Philosophy: The D'oh! of Homer
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- 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
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- 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. Gathright
- 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
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- Thought of Thomas Aquinas
- Thoughtform
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- Thrasymachus
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- Three-valued logic
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- Three sided football
- Three Treasures (Taoism)
- Three Worlds Theory
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- 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
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- Timaeus (dialogue)
- Timaeus of Locri
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- Time
- Time and Free Will
- Time loop
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- Time travel
- Timeline of Eastern philosophers
- Timeline of Niccolò Machiavelli
- Timeline of philosophers
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- Timo Airaksinen
- Timocrates of Lampsacus
- Timolaus of Cyzicus
- Timon (philosopher)
- Timon of Philius
- Timon of Phlius
- Timothy Chambers
- Timothy Smiley
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- Timycha
- Tine Hribar
- Tiqqun
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- Tiruvalluvar
- Tisias
- Titoism
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- To be
- Todd May
- Toegye
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- Token
- Token-type distinction
- Toleration
- Tolstoyan
- Tom Beauchamp
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- Tomer Devorah
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- Tomonobu Imamichi
- Tonghak
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- Tony Honoré
- Tony McWalter
- Toothpaste tube theory
- Top-down
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- Top down
- Topical logic
- Topics (Aristotle)
- Topus Uranus
- Torbjörn Tännsjö
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- Torquato Accetto
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- Torture
- Total ordering
- Totalism
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- Tottenham Outrage
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- Towards a Global Ethic: An Initial Declaration
- Toxin puzzle
- Trace (deconstruction)
- Trace monoid
- Trace theory
- Tractarian
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- Trademark argument
- Tradition
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- Tragic Week (Catalonia)
- Trail ethics
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- Trait ascription bias
- Tran Duc Thao
- Transaction logic
- Transcendence (philosophy)
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- Transcendent theosophy
- Transcendental apperception
- Transcendental argument
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- Transcendental arguments
- Transcendental idealism
- Transcendental number
- Transcendental realism
- Transcendental Students
- Transcendental theology
- Transcendentalism
- Transcendentals
- Transferable utility
- Transfinite induction
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- Transformation problem
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- Transitive closure
- Transitive relation
- Translating "law" to other European languages
- Translation
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- Transmigration of the soul
- Transmodernism
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- Transparency (linguistic)
- Transparent Intensional Logic
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- Transtheistic
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- Traugott Konstantin Oesterreich
- Treatise
- Tree of Porphyry
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- Tresconsciousness
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- 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
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- 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
- 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
- Vertiginous question
- 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-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 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
- Xavier Zubiri
- Xeer
- Xenarchus of Seleucia
- Xeniades
- Xenocrates
- Xenophanes
- Xenophilus
- Xenophon
- Xenotransplantation
- Xi Kang
- Xiaozi
- Ximen Bao
- Xiong Shili
- Xu Ai
- Xu Liangying
- Xu Youyu
- Xuanxue
- Xuanzang
- Xun Zi
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
- Zimboe
- Zinaida Ignatyeva
- Zine library
- Zionism
- Zisi
- Zo d'Axa
- Zofia Zdybicka
- Zohar
- Zoilus
- Zollikon Seminars
- Zombie
- Zongmi
- Zoran Đinđić
- Zorn's lemma
- Zoroaster
- Zoroastrianism
- Zou Yan
- Zweckrationalität
- Zygmunt Łempicki
- Zygmunt Zawirski