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0–9
- 14th Dalai Lama
- 16 Questions on the Assassination
- 1649 in philosophy
- 1658 in philosophy
- 17th-century philosophy
- 18th-century philosophy
- 1919 United States anarchist bombings
- 1922 in philosophy
- 1926 in philosophy
- 1962 in philosophy
- 1972 in philosophy
- 1973 in philosophy
- 1974 in philosophy
- 1975 in philosophy
- 1976 in philosophy
- 1977 in philosophy
- 1978 in philosophy
- 1979 in philosophy
- 1980 in philosophy
- 19th-century philosophy
- 20th-century philosophy
- 20th-century Western painting
A
- A-series and B-series
- A Buyer's Market
- A Calendar of Wisdom
- A Conflict of Visions
- A Contribution to the Critique of Political Economy
- A Defence of Common Sense
- A Defense of Abortion
- A Dissertation on Liberty and Necessity, Pleasure and Pain
- A Few Words on Non-Intervention
- A Fórmula de Deus
- A fortiori argument
- A General View of Positivism
- A Grief Observed
- A Guide for the Perplexed
- A Happy Death
- A History of God
- A History of Murphy's Law
- A History of Philosophy (Copleston)
- A History of Western Philosophy
- A las Barricadas
- A Legend of Old Egypt
- A Letter Concerning Toleration
- A maiore ad minus
- A Mathematician's Apology
- A Message from the Emperor
- A minore ad maius
- A New Era of Thought
- A New Model of the Universe
- A New Philosophy of Society: Assemblage Theory and Social Complexity
- A New Refutation of Time
- A Philosophical Enquiry into the Origin of Our Ideas of the Sublime and Beautiful
- A posteriori
- A priori (philosophy)
- A priori and a posteriori
- A Salty Piece of Land
- A Scanner Darkly
- A Secular Humanist Declaration
- A Short History of Chinese Philosophy
- A System of Logic
- A Thousand Plateaus
- A Thousand Years of Nonlinear History
- A Treatise Concerning the Principles of Human Knowledge
- A Treatise of Human Nature
- A Vindication of Natural Society
- A Vindication of the Rights of Men
- A Vindication of the Rights of Woman
- A Voyage to Arcturus
- A. A. Long
- A. A. Luce
- A. C. Ewing
- A. C. Grayling
- A. D. Gordon
- A. H. Almaas
- A. H. Armstrong
- A. J. Baker (philosopher)
- A. V. Dicey
- A. W. Benn
- A. P. Martinich
- A. R. Natarajan
- Ab ovo
- Abacus logic
- Abahlali baseMjondolo
- Abandonment (existentialism)
- Abas (sophist)
- Abbasgulu Bakikhanov
- Abd al-Karīm ibn Hawāzin al-Qushayri
- Abd al-Rahman al-Kawakibi
- Abd al-Rahman Ibn Khaldun
- Abdallah ibn Yasin
- Abdel-Halim Mahmoud
- Abdel Rahman Badawi
- Abdel Wahab Elmessiri
- Abderites
- Abdoldjavad Falaturi
- Abdolkarim Soroush
- Abductive logic programming
- Abductive reasoning
- Abductive validation
- Abdullah Yusuf Azzam
- Abdurrahman Ibn Khaldun
- Abdurrahmān Ibn Khaldūn
- Abel Paz
- Abhayakaragupta
- Abhidhamma Pitaka
- Abhidharma
- Abhinavagupta
- Abilene paradox
- Abimael Guzmán
- Abjection
- Abjunction
- Abner of Burgos
- Abner Shimony
- Abolishing the Borders from Below
- Abortion
- Abortion debate
- Aboutness
- Abraham Abigdor
- Abraham Abulafia
- Abraham bar Hiyya
- Abraham ben Moses Maimon
- Abraham ben Moses Maimonides
- Abraham Cohen de Herrera
- Abraham Edel
- Abraham ibn Daud
- Abraham Ibn Daud
- Abraham ibn Ezra
- Abraham Ibn Ezra
- Abraham Isaac Kook
- Abraham Joshua Heschel
- Abraham Kaplan
- Abraham Kovoor
- Abraham Leon
- Abraham Robinson
- Abraham Tucker
- Abraham Yagel
- Abraham Yehudah Khein
- Abram Deborin
- Absolute (philosophy)
- Absolute atheism
- Absolute idealism
- Absolute infinite
- Absolute space
- Absolute theory
- Absolute threshold
- Absolute time
- Absolute truth
- Abstinence
- Abstract art
- Abstract entity
- Abstract expressionism
- Abstract Illusionism
- Abstract Imagists
- Abstract labour and concrete labour
- Abstract object
- Abstract objects
- Abstract particulars
- Abstract process
- Abstract semantic graph
- Abstraction
- Abstraction (philosophy)
- Abstractionism
- Absurdism
- Abu'l Hasan Muhammad Ibn Yusuf al-'Amiri
- Abu'l Walid Muhammad Ibn Rushd
- Abu 'Ali al-Husayn Ibn Sina
- Abu al-Hakam al-Kirmani
- Abu al-Hasan al-Ash'ari
- Abu Bakr Ibn Bajja
- Abu Bakr Ibn Bājja
- Abu Bakr Ibn Ţufayl
- Abu Bakr Muhammad Ibn Tufayl
- Abu Bakr Muhammad Ibn Yahya Ibn as-Say'igh Ibn Bajja
- Abu Bakr Muhammad Ibn Zakariyya' al-Razi
- Abu Hamid al-Ghazali
- Abu Hamid Muhammad al-Ghazali
- Abū Hayyān al-Tawhīdī
- Abu Mansur Maturidi
- Abu Muhammad 'Ali Ibn Hazm
- Abu Nasr al-Farabi
- Abū Nasr al-Fārābī
- Abu Rayhan Biruni
- Abu Sulayman al-Sijistani
- Abu Sulayman Muhammad al-Sijistani
- Abu Tahir Marwazi
- Abu Yaqub Sijistani
- Abu Yusuf Ya'qub ibn Ishaq al-Kindi
- Abul Ala Maududi
- Academic art
- Academic authorship
- Academic freedom
- Academic skepticism
- Academy
- Acatalepsy
- Accademia degli Infiammati
- Accent
- Acceptance
- Accessibility
- Accessibility relation
- Accident
- Accident (fallacy)
- Accident (philosophy)
- Accidental necessity
- Accidental properties
- Accidental property
- Accidentalism
- Accidie
- Accountability
- Accountant-client privilege
- Accounting ethics
- Accounting reform
- Accumulation by dispossession
- Acharya Hemachandra
- Achieving Our Country
- Achille Gagliardi
- Achille Varzi (philosopher)
- Achilles paradox
- Achintya Bheda Abheda
- Acosmism
- Acquaintance
- Acquiescence bias
- Acquired taste
- Acrasia
- Acratas
- Acrion
- Act utilitarianism
- Acting Out (book)
- Action (philosophy)
- Action at a distance
- Action Philosophers!
- Action theory (philosophy)
- Action verb
- Active citizenship
- Active intellect
- Actor–observer bias
- Acts of Literature
- Acts of the Apostles
- Actual idealism
- Actual Idealism
- Actual infinite
- Actual infinity
- Actualism
- Actualist
- Actuality
- Actuel Marx
- Actus et potentia
- Actus primus
- Actus purus
- Acumenus
- Acyutananda
- Ad captandum
- Ad feminam
- Ad hoc
- Ad hoc hypothesis
- Ad hominem
- Ad hominem argument
- Ad infinitum
- Ad nauseam
- Ada Albrecht
- Adalbertus Ranconis de Ericinio
- Adam Burski
- Adam de Buckfield
- Adam de Wodeham
- Adam Ferguson
- Adam Ignacy Zabellewicz
- Adam Karl August von Eschenmayer
- Adam Mahrburg
- Adam Morton
- Adam Müller
- Adam of Łowicz
- Adam Parvipontanus
- Adam Pulchrae Mulieris
- Adam Schaff
- Adam Smith
- Adam Steuart
- Adam Tanner (mathematician)
- Adam Weishaupt
- Adam Wodeham
- Adam Zachary Newton
- Adamantios Korais
- Adamites
- Adaptation
- Adaptive bias
- Adaptive grammar
- Adaptive representation
- Adaptive system
- Addiction
- Addison Webster Moore
- Addition (logic)
- Adela Cortina
- Adelard of Bath
- Adevism
- Adi Ophir
- Adi Sanakara Philosophy
- Adi Shankara
- Adiaphora
- Adicity
- Admissible rule
- Adolf Grünbaum
- Adolf Lasson
- Adolf Lindenbaum
- Adolf Reinach
- Adolf von Harnack
- Adolfo Sánchez Vázquez
- Adolfo Veber Tkalčević
- Adolph Stöhr
- Adrastus of Aphrodisias
- Adriaan Koerbagh
- Adrian Piper
- Adriana Cavarero
- Adriano Tilgher (philosopher)
- Adrianus
- Adrsta
- Adultery
- Advaita
- Advaita Vedanta
- Advance health care directive
- Adventures of Wim
- Adverbs
- Adverse effect
- Advertising
- Advice (opinion)
- Aedesia
- Aedesius
- Aeneas of Gaza
- Aenesidemus
- Aenesidemus (book)
- Aequiprobabilism
- Aesara
- Aeschines of Neapolis
- Aeschines of Sphettus
- Aesthetic distance
- Aesthetic emotions
- Aesthetic of Ugliness
- Aesthetic Realism
- Aesthetic relativism
- Aestheticism
- Aestheticization of politics
- Aestheticization of violence
- Aesthetics
- Aesthetics of music
- Aeterni Patris
- Aether
- Aether (classical element)
- Aetius (philosopher)
- Affect (philosophy)
- Affect heuristic
- Affection
- Affectionism
- Affective
- Affective forecasting
- Affine logic
- Affirmative action
- Affirmative conclusion from a negative premise
- Affirming a disjunct
- Affirming the antecedent
- Affirming the consequent
- African philosophy
- African Spir
- African Uplands
- Africana philosophy
- Africana womanism
- Afrikan Spir
- Afshin Ellian
- After Many a Summer
- After Virtue
- Afterlife
- Against Civilization: Readings and Reflections
- Against His-Story, Against Leviathan
- Against the Day
- Āgama (Buddhism)
- Āgama (Hinduism)
- Āgama (Jainism)
- Agama Hindu Dharma
- Agapē
- Agapē Agape
- Agapius of Athens
- Agathism
- Agathobulus
- Agathon
- Agathosthenes
- Agathusia and aschimothusia
- Age of Enlightenment
- Age of Reason
- Age of reason (canon law)
- Agency (philosophy)
- Agent (law)
- Agent Communications Language
- Aggadah
- Aggression
- Aggressionism
- Ágnes Heller
- Agnostic
- Agnostic atheism
- Agnostic existentialism
- Agnostic theism
- Agnosticism
- Agonism
- Agonistic liberalism
- Agonistic pluralism
- Agorism
- Agostinho da Silva
- Agostino Nifo
- Agrarianism
- Agricultural philosophy
- Agrippa the Skeptic
- Ahad Ha'am
- Ahamkāra
- Ahankara
- Ahimsa
- Ahimsa in Jainism
- Ahistoricism
- Ahl ar-ra'y
- Ahmad Ahmadi (philosopher)
- Ahmad Fardid
- Ahmad Ibn Muhammad Ibn Miskawayh
- Ahmad Nadeem Qasimi
- Ahmad Sirhindi
- Ahmed Hulusi
- Ahura Mazda
- AI effect
- Ai Siqi
- Aijaz Ahmad
- Aizawa Seishisai
- Ajahn Amaro
- Ajahn Chah
- Ajahn Sumedho
- Ajahn Sundara
- Ajita Kesakambali
- Ajivika
- AK Press
- Ākāśa
- Akeel Bilgrami
- Akira Asada
- Akira Yamada
- Akka Mahadevi
- Akrasia
- Al-Farabi
- Al-Fārābī
- Al-Ghazali
- Al-Ghazālī
- Al-Hajj Salim Suwari
- Al-Hilli
- Al-Jahiz
- Al-Jubba'i
- Al-Juwayni
- Al-Khazini
- Al-Khidr
- Al-Kindi
- Al-Kindī
- Al-Ma`arri
- Al-Mawardi
- Al-Nahda
- Al-Rāzī
- Al-Shahrastani
- Al-Shahrazuri
- Al-Shirazi
- Al-Sijistani
- Al-Tabarani
- Al-Tawhidi
- Al-Zamakhshari
- Al Amiri
- Alain Badiou
- Alain de Benoist
- Alain de Botton
- Alain de Lille
- Alain Etchegoyen
- Alain Finkielkraut
- Alain LeRoy Locke
- Alan Carter (philosopher)
- Alan Donagan
- Alan Gewirth
- Alan Grant (writer)
- Alan Mathison Turing
- Alan Millar
- Alan Moore
- Alan Musgrave
- Alan of Lynn
- Alan Ross Anderson
- Alan Ryan
- Alan Soble
- Alan Stout (philosopher)
- Alan Turing
- Alan Watts
- Alan Woods (politician)
- Alasdair C. MacIntyre
- Alasdair MacIntyre
- Alasdair Urquhart
- Alastair Hannay
- Alastair Norcross
- Ālaya-vijñāna
- Albert (short story)
- Albert Blumberg
- Albert Borgmann
- Albert Camus
- Albert Chernenko
- Albert Einstein
- Albert Lautman
- Albert Meltzer
- Albert of Saxony (philosopher)
- Albert Outler
- Albert Parsons
- Albert Rivaud
- Albert Schwegler
- Albert Schweitzer
- Albert Venn Dicey
- Alberto Jori
- Alberto Moreiras
- Alberto Toscano
- Albertus Magnus
- Albinus (philosopher)
- Albrecht Ritschl
- Albrecht von Müller
- Albrecht Wellmer
- Alchemy
- Alcinous (philosopher)
- Alciphron (book)
- Alcmaeon of Croton
- Alcuin
- Aldo Gargani
- Alejandro Deustua
- Alejandro Korn
- Alejandro Rossi
- Alejandro Rozitchner
- Aleksander Świętochowski
- Aleksandr Danilovich Aleksandrov
- Aleksandr Ivanovich Herzen
- Aleksandr Zinovyev
- Aleksei Losev
- Aleksey Khomyakov
- Alenka Zupančič
- Aleš Ušeničnik
- Alessandro Achillini
- Alessandro Piccolomini
- Aletheia
- Alethiology
- Alex Callinicos
- Alex Comfort
- Alex Grey
- Alexamenus of Teos
- Alexander Atabekian
- Alexander Bain
- Alexander Berkman
- Alexander Bogdanov
- Alexander Bonini
- Alexander Bryan Johnson
- Alexander Campbell Fraser
- Alexander Crombie
- Alexander Esenin-Volpin
- Alexander George (philosopher)
- Alexander Gerard
- Alexander Gottlieb Baumgarten
- Alexander Herzen
- Alexander Meiklejohn
- Alexander Neckam
- Alexander Neckham
- Alexander Nehamas
- Alexander of Aegae
- Alexander of Aphrodisias
- Alexander of Hales
- Alexander Pfänder
- Alexander Piatigorsky
- Alexander Rosenberg
- Alexander S. Kechris
- Alexander Schapiro
- Alexander Sutherland (educator)
- Alexander Tille
- Alexandr Ivanovich Herzen
- Alexandre Kojeve
- Alexandre Kojève
- Alexandre Koyré
- Alexandrian school
- Alexandros Schinas
- Alexandru Bogdan-Piteşti
- Alexandru Dragomir
- Alexicrates
- Alexinus
- Alexis de Tocqueville
- Alexis Kagame
- Alexis Rosenbaum
- Alexius Meinong
- Alf Ahlberg
- Alf Ross
- Alfonso Falero
- Alfred Adler
- Alfred Baeumler
- Alfred Binet
- Alfred Brunswig
- Alfred Edward Taylor
- Alfred Espinas
- Alfred Henry Lloyd
- Alfred Horn
- Alfred I. Tauber
- Alfred Jules Ayer
- Alfred Jules Émile Fouillée
- Alfred Kastil
- Alfred Loisy
- Alfred Mele
- Alfred North Whitehead
- Alfred of Sareshel
- Alfred Rosenberg
- Alfred Russel Wallace
- Alfred Schmidt (philosopher)
- Alfred Schutz
- Alfred Schütz
- Alfred Sohn-Rethel
- Alfred Tarski
- Alfred Wilm
- Alfredo M. Bonanno
- Algazel
- Algebra
- Algebraic normal form
- Algernon Charles Swinburne
- Algorithm
- Alhazen
- Alic Halford Smith
- Alice Ambrose
- Alice Bailey
- Alice von Hildebrand
- Alienation
- Alison Wylie
- All
- All About Love: New Visions
- All and Everything
- All horses are the same color
- All men are created equal
- All That Is Solid Melts into Air
- All Truth Is God's Truth
- Allan Antliff
- Allan Bloom
- Allan Gibbard
- Allan Gotthelf
- Allan Ramsay (1713-1784)
- Allegory of the cave
- Allegory of the Cave
- Allen Buchanan
- Alois Riehl
- Alon Ben-Meir
- Alonso Gutiérrez
- Alonzo Church
- Aloys Hirt
- Alpha et Omega
- Alphabet of human thought
- Alphonso Lingis
- Altered state of consciousness
- Alterity
- Alternative denial
- Alternative dispute resolution
- Alternative Media Project
- Alternative Press Review
- Altheides
- Altruism
- Alvin Goldman
- Alvin Plantinga
- Always already
- Ama-gi
- Amadeo Bordiga
- Amafinius
- Amakasu Incident
- Amalric of Bena
- Amartya K. Sen
- Amartya Sen
- Ambiguity
- Ambiguity effect
- Ambrose
- Ambrosius Theodosius Macrobius
- Amelius
- America at the Crossroads
- American Bar Association Model Code of Professional Responsibility
- American Bar Association Model Rules of Professional Conduct
- American Catholic Philosophical Association
- American Catholic Philosophical Quarterly
- American Craftsman
- American Empire (style)
- American Enlightenment
- American Indian Movement
- American Journal of Bioethics
- American Philosophical Association
- American Philosophical Quarterly
- American Philosophical Society
- American philosophy
- American realism
- American Society for Political and Legal Philosophy
- Amerika (novel)
- Amicus Plato, sed magis amica veritas
- Amilcar Cabral
- Amílcar Cabral
- Amilcare Cipriani
- Ammon Hennacy
- Ammonius Hermiae
- Ammonius of Alexandria (Christian philosopher)
- Ammonius of Athens
- Ammonius Saccas
- Amoralism
- Amorality
- Amos Bronson Alcott
- Amour-propre
- Amour de soi
- Amphibology
- Amphiboly
- Amsterdam Declaration
- Amy Gutmann
- Amynomachus
- An Enquiry concerning Human Understanding
- An Enquiry Concerning Human Understanding
- An Enquiry Concerning the Principles of Morals
- An Essay Concerning Human Understanding
- An Essay on the History of Civil Society
- An Essay on the Principle of Population
- An Honest Thief
- An Hyang
- An Intelligent Person's Guide to Atheism
- An Occurrence at Owl Creek Bridge
- An Sich
- Anacharsis
- Anāgāmi
- Analects
- Analects of Confucius
- Analogy
- Analogy of the divided line
- Analysis
- Analysis (journal)
- Analysis (philosophy)
- Analysis paralysis
- Analytic philosophy
- Analytic-synthetic distinction
- Analytic and synthetic knowledge
- Analytic and synthetic statements
- Analytic ethics
- Analytic hierarchy
- Analytic jurisprudence
- Analytic knowledge
- Analytic Marxism
- Analytic philosophy
- Analytic proof
- Analytic proposition
- Analytic reasoning
- Analytical hierarchy
- Analytical jurisprudence
- Analytical philosophy
- Analytical psychology
- Analytical Thomism
- Anamnesis (philosophy)
- Anamorphosis
- Anan ben David
- Ānanda
- Ananda Coomaraswamy
- Anandamaya kosha
- Anandavardhana
- Anangeon
- Ananke
- Anantarika-karma
- Anaphor
- Anaphora
- Anarch (sovereign individual)
- Anarcha-feminism
- Anarchism
- Anarchism and anarcho-capitalism
- Anarchism and animal rights
- Anarchism and capitalism
- Anarchism and Friedrich Nietzsche
- Anarchism and Islam
- Anarchism and Marxism
- Anarchism and nationalism
- Anarchism and the arts
- Anarchism and violence
- Anarchism in Africa
- Anarchism in America (film)
- Anarchism in Asia
- Anarchism in Australia
- Anarchism in Brazil
- Anarchism in Canada
- Anarchism in China
- Anarchism in Cuba
- Anarchism in England
- Anarchism in France
- Anarchism in Greece
- Anarchism in Iceland
- Anarchism in India
- Anarchism in Ireland
- Anarchism in Israel
- Anarchism in Italy
- Anarchism in Japan
- Anarchism in Korea
- Anarchism in Mexico
- Anarchism in Poland
- Anarchism in Russia
- Anarchism in Spain
- Anarchism in Sweden
- Anarchism in the United States
- Anarchism in Turkey
- Anarchism in Ukraine
- Anarchism in Vietnam
- Anarchism without adjectives
- Anarchism: A Documentary History of Libertarian Ideas
- Anarchist Black Cross
- Anarchist Black Cross Federation
- Anarchist Black Cross Network
- Anarchist Bookfair
- Anarchist Catalonia
- Anarchist communism
- Anarchist Exclusion Act
- Anarchist Federation (Britain and Ireland)
- Anarchist law
- Anarchist Manifesto
- Anarchist People of Color
- Anarchist schools of thought
- Anarchist St. Imier International
- Anarchist Studies
- Anarchist symbolism
- Anarchist terminology
- Anarchistic free school
- Anarchists (film)
- Anarchists Against the Wall
- Anarcho-capitalism
- Anarcho-capitalism and minarchism
- Anarcho-capitalist literature
- Anarcho-capitalist symbolism
- Anarcho-pacifism
- Anarcho-primitivism
- Anarcho-punk
- Anarcho-syndicalism
- Anarcho-Syndicalism (book)
- Anarcho-Syndicalist Review
- Anarcho-syndicalist symbolism
- Anarchy
- Anarchy (book)
- Anarchy Alive!
- Anarchy Archives
- Anarchy Comics
- Anarchy in the Age of Dinosaurs
- Anarchy Magazine
- Anarchy, State, and Utopia
- Anarchy: A Journal of Desire Armed
- Anarky
- Anarky (comic book)
- Anat Biletzki
- Anathon Aall
- Anatoly Lunacharsky
- Anatta
- Anava
- Anaxagoras
- Anaxarchus
- Anaxilaus
- Anaximander
- Anaximenes of Miletus
- Ancestral
- Ancestral relation
- Anchoring
- Ancient commentators project
- Ancient Greek philosophy
- Ancient philosophy
- Ancient skepticism
- Ancient Wisdom, Modern World
- And you are lynching Negroes
- Anders Chydenius
- Anders Nygren
- Anders Vilhelm Lundstedt
- Ando Shoeki
- André-François Deslandes
- André-Marie Ampère
- André Comte-Sponville
- André Glucksmann
- André Gorz
- André Malet (philosopher)
- André Malraux
- André of Neufchâteau
- Andrea Bonomi
- Andrea Cesalpino
- Andreas Kinneging
- Andreas Speiser
- Andrei Andreevich Markov
- Andrei Marga
- Andrej Grubacic
- Andres Luure
- Andrés Ortiz-Osés
- Andrew Baxter
- Andrew Bernstein (philosopher)
- Andrew Feenberg
- Andrew Janiak
- Andrew of Cornwall
- Andrew Pyle (philosopher)
- Andrew Seth Pringle-Pattison
- Andries Mac Leod
- Androcentrism
- Androcydes (Pythagorean)
- Android epistemology
- Andronicus of Rhodes
- Andrzej Mostowski
- Andrzej Towiański
- Andy Blunden
- Andy Clark
- Andy Warhol
- Anekantavada
- Ángel Rama
- Angelaki
- Angeli (novel)
- Angelo Galli
- Anger
- Angie Hobbs
- Anglo-Japanese style
- Angst
- Anguish
- Angus Taylor (philosopher)
- Anima mundi
- Anima mundi (spirit)
- Animal consciousness
- Animal Experimentation: Opposing Viewpoints
- Animal language
- Animal Liberation (book)
- Animal rights
- Animal spirits
- Animals in Buddhism
- Animistic fallacy
- Anioł Dowgird
- Anja Steinbauer
- Anna-Teresa Tymieniecka
- Anna Maria van Schurman
- Anne Conway, Viscountess Conway
- Anne Finch
- Anne Louise Germaine de Staël
- Annemarie Gethmann-Siefert
- Annemarie Mol
- Annette Baier
- Anniceris
- Anomalous monism
- Anomie
- Ansatz
- Anselm Jappe
- Anselm of Canterbury
- Anselm of Laon
- Anselme Bellegarrigue
- Ansgar Beckermann
- Answer to Job
- Answering the Question: What Is Enlightenment?
- Antahkarana
- Antanas Maceina
- Antecedent (logic)
- Antenor Orrego
- Anteo Zamboni
- Antepredicament
- Anthem (novella)
- Anthony Ashley-Cooper, 3rd Earl of Shaftesbury
- Anthony Collins
- Anthony Gottlieb
- Anthony John Patrick Kenny
- Anthony Kenny
- Anthony O'Hear
- Anthony of the Mother of God
- Anthony Quinton
- Anthony Quinton, Baron Quinton
- Anthony Rayson
- Anthony Thiselton
- Anthropic principle
- Anthropocentrism
- Anthropopath
- Anthropopathy
- Anthroposophy
- Anti-art
- Anti-authoritarianism
- Anti-clericalism
- Anti-communism
- Anti-consumerism
- Anti-Dühring
- Anti-environmentalism
- Anti-foundationalism
- Anti-Germans (communist current)
- Anti-modernization
- Anti-Œdipus
- Anti-psychiatry
- Anti-psychologism
- Anti-racist mathematics
- Anti-realism
- Anti-Revisionism
- Anti-Semite and Jew
- Anti-Semitism
- Anti-State Justice
- Anti-statism
- Anti-Supernaturalism
- Anti-systemic library
- Anti-voting
- Anti-work
- Anticonformism
- Antigone (Sophocles)
- Antihumanism
- Antimilitarism
- Antinatalism
- Antinomianism
- Antinomies
- Antinomy
- Antiochus Kantemir
- Antiochus of Ascalon
- Antipater
- Antipater of Cyrene
- Antipater of Tarsus
- Antipater of Tyre
- Antiperistasis
- Antiphon
- Antiphon (person)
- Antireductionism
- Antireligion
- Antiscience
- Antisthenes
- Antitheism
- Antithesis
- Antoine-Augustin Cournot
- Antoine Arnauld
- Antoine Augustin Cournot
- Antoine Destutt de Tracy
- Antoine Lavoisier
- Antoine Le Grand
- Anton Ambschel
- Anton Günther
- Anton Kržan
- Anton LaVey
- Anton Wilhelm Amo
- Antonin Sertillanges
- Antoninus (philosopher)
- Antonio Beccadelli
- Antonio Caso Andrade
- António Castanheira Neves
- Antonio Comellas y Cluet
- Antonio Cua
- António Damásio
- Antonio Genovesi
- Antonio Gramsci
- Antonio Labriola
- Antonio Negri
- Antonio Rosmini
- Antonio Rosmini-Serbati
- Antonio Téllez
- Antony Flew
- Antwerp school
- Anuario Filosófico
- Aous Shakra
- Apagoge
- Aparoksanubhuti
- Aparokshanubhuti
- Apatheia
- Apatheism
- Apeiron (cosmology)
- Aphorism
- Apocalypticism
- Apocatastasis
- Apodictic
- Apodicticity
- Apodosis
- Apollodorus of Seleucia
- Apollodorus the Epicurean
- Apollonian and Dionysian
- Apollonius Cronus
- Apollonius of Tyana
- Apollonius of Tyre (philosopher)
- Apologetics
- Apologism
- Apology (Plato)
- Apology (Xenophon)
- Apology of Aristides
- Aponia
- Apophasis
- Apophatic theology
- Apophenia
- Aporetic
- Aporia
- Aporime
- Aposteriori
- Appeal to advantage
- Appeal to authority
- Appeal to belief
- Appeal to consequences
- Appeal to emotion
- Appeal to fear
- Appeal to flattery
- Appeal to motive
- Appeal to nature
- Appeal to novelty
- Appeal to pity
- Appeal to probability
- Appeal to ridicule
- Appeal to spite
- Appeal to tradition
- Appellation
- Apperception
- Appiano Buonafede
- Applicative Universal Grammar
- Applied aesthetics
- Applied art
- Applied ethics
- Applied ontology
- Applied philosophy
- Apportionment paradox
- Approximation
- Aptitude
- Apuleius
- Arab transmission of the Classics to the West
- Arabic philosophy
- Arabic Sciences and Philosophy
- Aramesh Doustdar
- Arbeter Fraynd
- Arbitrariness
- Arbitration
- Arborescent
- Arcadia (play)
- Arcesilaus
- Archaeological ethics
- Arche
- Archē
- Archedemus of Tarsus
- Archeio-Marxism
- Archelaus (philosopher)
- Archetype
- Archibald Alison (author)
- Archibald Campbell (philosopher)
- Archie J. Bahm
- Archimedes
- Architectonic
- Archive Fever
- Archytas
- Arda Denkel
- Areopagitica
- Aretaic
- Aretaic turn
- Arete (moral virtue)
- Arete of Cyrene
- Aretology
- Argentine Libertarian Federation
- Argentine Regional Workers' Federation
- Argument
- Argument form
- Argument from authority
- Argument from beauty
- Argument from consciousness
- Argument from degree
- Argument from design
- Argument from desire
- Argument from evil
- Argument from fallacy
- Argument from free will
- Argument from ignorance
- Argument from illusion
- Argument from inconsistent revelations
- Argument from love
- Argument from marginal cases
- Argument from miracles
- Argument from morality
- Argument from nonbelief
- Argument from poor design
- Argument from queerness
- Argument from Reason
- Argument from religious experience
- Argument from silence
- Argument in the alternative
- Argument map
- Argument to moderation
- Argumentation theory
- Arguments for eternity
- Arguments for the existence of God
- Argumentum ad baculum
- Argumentum ad crumenam
- Argumentum ad hominem
- Argumentum ad ignorantium
- Argumentum ad lapidem
- Argumentum ad lazarum
- Argumentum ad misericordiam
- Argumentum ad numerum
- Argumentum ad populum
- Argumentum ad verecundiam
- Arhat
- Ariadne's thread (logic)
- Arianism
- Ariel Salleh
- Arignote
- Arimneste
- Arindam Chakrabarti
- Aristides of Athens
- Aristion
- Aristippus
- Aristippus the Younger
- Aristo of Alexandria
- Aristo of Ceos
- Aristo of Chios
- Aristobulus of Paneas
- Aristoclea
- Aristocles of Messene
- Aristocracy
- Aristocreon
- Aristonymus
- Aristotelian ethics
- Aristotelian logic
- Aristotelian physics
- Aristotelian rhetoric
- Aristotelian Society
- Aristotelian Society for the Systematic Study of Philosophy
- Aristotelian theory of gravity
- Aristotelian view of a god
- Aristotelian view of God
- Aristotelianism
- Aristotle
- Aristotle's Masterpiece
- Aristotle's theory of universals
- Aristotle's views on women
- Aristotle's wheel paradox
- Aristotle for Everybody
- Aristoxenus
- Arithmetic
- Arithmetic hierarchy
- Arithmetization of analysis
- Arity
- Arius
- Arius Didymus
- Arkhē
- Armand Robin
- Armchair revolutionary
- Armin Mohler
- Arminianism
- Arne Johan Vetlesen
- Arne Naess
- Arne Næss
- Arno Ros
- Arnold Davidson
- Arnold Gehlen
- Arnold Geulincx
- Arnold Ruge
- Arnold J. Toynbee
- Arnouphis
- Aron Gurwitsch
- Arrian
- Arrow's impossibility theorem
- Arrow's paradox
- Arrow's theorem
- Arrow of time
- Arrow paradox
- Ars inveniendi
- Ars Poetica (Horace)
- Art
- Art and morality
- Art as Experience
- Art criticism
- Art Deco in Durban
- Art for art's sake
- Art forgery
- Art manifesto
- Art movement
- Art periods
- Arte Povera
- Artforum
- Arthur Balfour
- Arthur C. Danto
- Arthur Coleman Danto
- Arthur Collier
- Arthur Danto
- Arthur de Gobineau
- Arthur Drews
- Arthur F. Holmes
- Arthur Fine
- Arthur Koestler
- Arthur Lehning
- Arthur Linton Corbin
- Arthur Lipsett
- Arthur M. Young
- Arthur Moeller van den Bruck
- Arthur Norman Prior
- Arthur Oncken Lovejoy
- Arthur Pap
- Arthur Prior
- Arthur Schafer
- Arthur Schopenhauer
- Arthur Schopenhauer's aesthetics
- Arthur Stanley Eddington
- Arthur Willink
- Artificial brain
- Artificial consciousness
- Artificial intelligence
- Artificial language
- Artificial life
- Artist
- Artistic expression
- Artistic freedom
- Artistic inspiration
- Artistic interpretation
- Artistic merit
- Artistic revolution
- Artistic style
- Arto Haapala
- Arts and Crafts Movement
- Arts criticism
- Arturo Andrés Roig
- Artworld
- Arvi Grotenfelt
- Arya
- Arya Samaj
- Aryadeva
- As a Man Thinketh
- As I Lay Dying (novel)
- As I was going to St Ives
- As if
- As She Climbed Across the Table
- Asa Gray
- Asa Kasher
- Asanga
- Asceticism
- Asclepiades of Phlius
- Asclepiades the Cynic
- Asclepigenia
- Asclepiodotus (philosopher)
- Asclepiodotus of Alexandria
- Asclepius of Tralles
- Ascribed status
- Ascriptivism
- Aseity
- Ashanti Alston
- Ashcan School
- Asher Ginzberg
- Ashley Treatment
- Ashtamangala
- Asian values
- Asiatic mode of production
- Askapāda Gotama
- Asociación Continental Americana de Trabajadores
- Aspasius
- Assertion
- Assertoric
- Assi Rahbani
- Assisted suicide
- Association fallacy
- Association for Logic, Language and Information
- Association for Symbolic Logic
- Association for the Scientific Study of Consciousness
- Association of Autonomous Astronauts
- Association of ideas
- Associationism
- Associative law
- Āstika and nāstika
- Astrology
- Aśvaghoṣa
- Asymmetrical
- Ataraxia
- Ateneo de la Juventud
- Athanasius of Alexandria
- Atheism
- Atheist's Wager
- Atheist existentialism
- Athenaeus of Seleucia
- Athenian democracy
- Athenodoros Cananites
- Athenodoros Cordylion
- Athenodorus of Soli
- Athens
- Athīr al-Dīn al-Abharī
- Atisha
- Atlantis
- Atlas Shrugged
- Atman (Buddhism)
- Ātman (Buddhism)
- Atman (Hinduism)
- Atomic fact
- Atomic sentence
- Atomism
- Atonement in Christianity
- Atonement in Judaism
- Atopy (philosophy)
- Atrocity story
- Attacking Faulty Reasoning
- Attalus (Stoic)
- Attempt at a Critique of All Revelation
- Attentional bias
- Atticus (philosopher)
- Attitude (psychology)
- Attitude polarization
- Attorney–client privilege
- Attorney misconduct
- Attorney/client privilege
- Attribute grammar
- Attribution theory
- Attributional bias
- Auberon Herbert
- Auctoritas
- Auctoritates Aristotelis
- Aufheben
- Augmented Backus–Naur form
- Augoeides
- August Cieszkowski
- August Wilhelm Schlegel
- Auguste Comte
- Auguste Vaillant
- Augustin Bonnetty
- Augustin Souchy
- Augustine Eriugena
- Augustine of Hippo
- Augustinian Studies
- Augustinian values
- Augusto César Sandino
- Augusto Vera
- Augustus De Morgan
- Aulus Egnatius Priscillianus
- Aulus Gellius
- Aurel Kolnai
- Austin Farrer
- Austin Marsden Farrer
- Austin Woodbury
- Australasian Association of Philosophy
- Australasian Journal of Philosophy
- Australian materialism
- Australian realism
- Austrofascism
- Autarchism
- Authenticity (philosophy)
- Authoritarianism
- Authority
- Auto-destructive art
- Autocracy
- Autoepistemic logic
- Autological
- Automata theory
- Automated reasoning
- Automatic sequence
- Automaton
- Autonomedia
- Autonomism
- Autonomous Action
- Autonomy
- Autopoiesis
- Avadhuta Gita
- Availability heuristic
- Avant-garde
- Avant-Garde and Kitsch
- Avatar
- Avecebrol
- Avempace
- Average and total utilitarianism
- Averaging argument
- Averroes
- Averroës
- Averroism
- Aversion therapy
- Avicebrol
- Avicebron
- Avicenna
- Avicenna Prize
- Avicennism
- Avidya (Hinduism)
- Avidyā (Buddhism)
- Avishai Margalit
- Avital Ronell
- Avodah
- Avraham son of Rambam
- Avrum Stroll
- Awareness
- Awareness League
- Axel Hägerström
- Axel Honneth
- Axial Age
- Axiochus (dialogue)
- Axiology
- Axiom
- Axiom of abstraction
- Axiom of choice
- Axiom of comprehension
- Axiom of Equity
- Axiom of extensionality
- Axiom of infinity
- Axiom of projective determinacy
- Axiom of reducibility
- Axiom of replacement
- Axiom of separation
- Axiom S5
- Axiom schema
- Axiomatic method
- Axiomatic set theory
- Axiomatic system
- Axiomatization
- Axiothea of Phlius
- Ayatana
- Ayn al-Quzat Hamadani
- Ayn Rand
- Ayn Rand: A Sense of Life
- Ayn Rand: The Russian Radical
- Ayurveda
- Ayyavazhi
- Ayyavazhi phenomenology
- Azizah Y. al-Hibri
- Aztec philosophy
B
- B-series
- B-Theory of time
- B. F. Skinner
- B. R. Ambedkar
- B. Traven
- Babette Babich
- Baby K
- Backgammon
- Backus–Naur form
- Backward causation
- Backward chaining
- Bad faith
- Bad faith (existentialism)
- Baden School
- Bahmanyār
- Bahshamiyya
- Bahya ibn Paquda
- Baker Brownell
- Balance (metaphysics)
- Balance of nature
- Balangoda Ananda Maitreya
- Baltasar Gracián
- Balthasar Bekker
- Banality of evil
- Banausos
- Bandwagon effect
- Bantu Philosophy
- Baptista Mantuanus
- Baptists in the history of separation of church and state
- Barba non facit philosophum
- Barbara
- Barbara Forrest
- Barbara Herrnstein Smith
- Barber paradox
- Barbershop paradox
- Barbizon school
- Barcan formula
- Barcelona May Days
- Bardo
- Bare particular
- Bargaining theory
- Barhaspatya sutras
- Barlaam of Seminara
- Baron d'Holbach
- Baron de Montesquieu
- Baron Herbert of Cherbury
- Baroque
- Baroque Revival architecture
- Barracks communism
- Barrie Karp
- Barrows Dunham
- Barry Loewer
- Barry Smith (ontologist)
- Barry Stroud
- Bartholomäus Keckermann
- Bartholomew Des Bosses
- Bartholomew Keckermann
- Bartholomew of Bologna (philosopher)
- Bartolomé de Medina
- Bartolommeo Spina
- Bartolus de Saxoferrato
- Baruch Spinoza
- Barwise prize
- Barzillai Quaife
- Bas C. van Fraassen
- Bas Haring
- Bas van Fraassen
- Base and superstructure
- Base and superstructure (Marxism)
- Base rate fallacy
- Basic belief
- Basic Limiting Principle
- Basic norm
- Basic Points Unifying the Theravāda and the Mahāyāna
- Basil Mitchell (academic)
- Basilides
- Basilides (Stoic)
- Basilides the Epicurean
- Basilios Bessarion
- Batis of Lampsacus
- Batman: Anarky
- Battle of Peregonovka (1919)
- Bauhaus
- Bay Area Figurative Movement
- Bayes' theorem
- Bayes's rule
- Bayes's theorem
- Bayesian probability
- Bayesianism
- Beatific vision
- Béatrice Longuenesse
- Beatriz Sarlo
- Beauty
- Becoming
- Becoming (philosophy)
- Bedeutung
- Beelzebub's Tales to His Grandson
- Beerwolf
- Begging the question
- Begriffsschrift
- Behavior therapy
- Behavioral script
- Behavioralism
- Behaviorism
- Behaviourism
- Behind the Mirror: A Search for a Natural History of Human Knowledge
- Behold a Pale Horse (film)
- Being
- Being and becoming
- Being and Nothingness
- Being and Time
- Being for itself
- Being in itself
- Béla Balázs
- Béla Hamvas
- Belief
- Belief-Desire-Intention model
- Belief-in
- Belief bias
- Belief in
- Belief revision
- Bell's inequality
- Bell's theorem
- Bellum omnium contra omnes
- Belmont Report
- Ben Salem Himmich
- Benedetto Croce
- Benedict de Spinoza
- Benedict Pereira
- Benedictus Spinoza
- Benedito Nunes
- Beneficence
- Benjamin Apthorp Gould Fuller
- Benjamin Constant
- Benjamin Franklin
- Benjamin Lee (academic)
- Benjamin Paul Blood
- Benjamin Peirce
- Benjamin Tucker
- Benjamin Whichcote
- Benny Lévy
- Benoît Broutchoux
- Benoît de Maillet
- Benson Mates
- Berlin Circle
- Bernard-Henri Lévy
- Bernard A. O. Williams
- Bernard Arthur Owen Williams
- Bernard Bolzano
- Bernard Bosanquet (philosopher)
- Bernard d'Espagnat
- Bernard de Fontenelle
- Bernard Delfgaauw
- Bernard Gert
- Bernard le Bovier de Fontenelle
- Bernard Le Bovier de Fontenelle
- Bernard Lonergan
- Bernard Mandeville
- Bernard Mayo
- Bernard Narokobi
- Bernard Nieuwentyt
- Bernard of Chartres
- Bernard of Clairvaux
- Bernard of Trilia
- Bernard Philip Kelly
- Bernard Rollin
- Bernard Silvestris
- Bernard Stiegler
- Bernard Williams
- Bernard Yack
- Bernardino Telesio
- Bernardino Varisco
- Bernhard Riemann
- Bernoulli's principle
- Bernoulli's theorem
- Berry's paradox
- Bert Mosselmans
- Berthold of Moosburg
- Berthold Wulf
- Bertil Mårtensson
- Bertrand paradox (economics)
- Bertrand paradox (probability)
- Bertrand's box paradox
- Bertrand Arthur William Russell
- Bertrand de Jouvenel
- Bertrand Russell
- Bertrand Russell's views on philosophy
- Bertrand Russell's views on society
- Best of all possible worlds
- Bête machine
- Betrayal
- Between Facts and Norms
- Between Heaven and Hell (novel)
- Between Past and Future
- Beuron Art School
- Beyond Belief: Science, Religion, Reason and Survival
- Beyond Freedom and Dignity
- Beyond Good and Evil
- Beyond the Pleasure Principle
- Bhagavad Gita
- Bhakti
- Bhartrhari
- Bhava
- Bhavanga
- Bhāvaviveka
- Bhedabheda
- Bhikhu Parekh, Baron Parekh
- Bhumi (Buddhism)
- Bias
- Bias blind spot
- Bible
- Biblical literalism
- Bibliography for Ayn Rand and Objectivism
- Biconditional
- Biconditional elimination
- Biconditional introduction
- Biennio rosso
- Big Book (thought experiment)
- Bigram
- Bill Martin (philosophy)
- Bilocation
- Binary opposition
- Biocentric universe
- Biocentrism (ethics)
- Biodefense
- Bioethics
- Bioethics (journal)
- Biofact (philosophy)
- Biofacticity
- Biographia Literaria
- Biographical fallacy
- Biological determinism
- Biological naturalism
- Biological warfare
- Biomedical tissue
- Bion of Borysthenes
- Biopolitics
- Biopower
- Biosafety
- Biosecurity
- Biosophy
- Biotic Baking Brigade
- Bisexuality
- Bite the bullet
- Bivalence
- Bjarni Jónsson
- Bl(A)ck Tea Society
- Black-Body Theory and the Quantum Discontinuity
- Black anarchism
- Black Artists Group
- Black Arts Movement
- Black bloc
- Black box
- Black box theory
- Black existentialism
- Black Flag (newspaper)
- Black Laundry
- Black Mask (anarchists)
- Black Panther Party
- Black Sotnia
- Black Star (anarchist group)
- Black swan theory
- Blackbird Raum
- Blackwell Companion to Philosophy
- Blaise Pascal
- Blame
- Blanquism
- Bleen
- Blindsight
- Blockhead (thought experiment)
- Blossius
- Bluestocking (journal)
- Bluestockings (bookstore)
- Blyenbergh
- Boasting
- Boatmen of Thessaloníki
- Bob Black
- Bob Hale (philosopher)
- Bodhi
- Bodhimandala
- Bodhisattva Precepts
- Bodhisena
- Body donation
- Body of Knowledge
- Body politic
- Body without organs
- Bodymind
- Boethius
- Boethus of Sidon (Peripatetic)
- Boethus of Sidon (Stoic)
- Boetius of Dacia
- Bohm interpretation
- Bohr–Einstein debates
- Bolam v Friern Hospital Management Committee
- Bolshevik
- Bolus of Mendes
- Bonapartism (Marxism)
- Bonaventure
- Boncompagno da Signa
- Bonifaty Kedrov
- Bonini's paradox
- Bonnie Honig
- Bonnie Steinbock
- Bonnot Gang
- Book of Causes
- Book of Changes
- Book of Life
- Boolean algebra (logic)
- Boolean grammar
- Bootstrapping
- Borden Parker Bowne
- Boredom
- Boris Chicherin
- Boris Furlan
- Boris Grushin
- Boris Hessen
- Borussian myth
- Bound variable
- Bourgeois
- Bourgeois socialism
- Bourgeoisie
- Bowling Green Studies in Applied Philosophy
- Boyd Henry Bode
- Boyle Lectures
- Bracha L. Ettinger
- Bracketing (phenomenology)
- Bracketing paradox
- Brad Hooker
- Brahma
- Brahmacharya
- Brahman
- Brahmavihara
- Brahmin
- Brahmo Samaj
- Brain
- Brain-in-a-vat theory
- Brain event
- Brain in a vat
- Brainstorm machine
- Brainstorms
- Brand Blanshard
- Brandon Darby
- Branko Bošnjak
- Brazilian Workers Confederation
- Breaking the Spell (film)
- Breaking the Spell: Religion as a Natural Phenomenon
- Brethren of Purity
- Brian Barry
- Brian Boyd
- Brian David Ellis
- Brian Davies (philosopher)
- Brian Klug
- Brian Leftow
- Brian Leiter
- Brian MacKenzie Infoshop
- Brian Massumi
- Brian O'Shaughnessy (philosopher)
- Brian Orend
- Brian Skyrms
- Brian Weatherson
- Bridge ethics
- Brie Gertler
- Brights movement
- British Empiricists
- British Humanist Association
- British idealism
- British Idealism
- British Journal of Aesthetics
- British Philosophical Association
- British philosophy
- Broadway Barks
- Bronisław Trentowski
- Bronius Kuzmickas
- Brontinus
- Brother Wolf
- Brownie points
- Bruce Lee
- Bruce Weinstein
- Bruce Wilshire
- Brunetto Latini
- Bruno Bauch
- Bruno Bauer
- Bruno de Finetti
- Bruno Leoni
- Brute fact
- Bryan Caplan
- Bryan Magee
- Bryson of Achaea
- Bryson of Heraclea
- Buchmanism
- Budaya
- Buddha-nature
- Buddhaghosa
- Buddhahood
- Buddhapālita
- Buddhism
- Buddhism and evolution
- Buddhist anarchism
- Buddhist ethics
- Buddhist philosophy
- Buddhist schools
- Buddhist view of marriage
- Buenaventura Durruti
- Bullshit
- Bulverism
- Bunched logic
- Bundle theory
- Bundle theory of the self
- Burali-Forte paradox
- Burali-Forti's paradox
- Burchard de Volder
- Burden of proof (logical fallacy)
- Bureaucracy
- Bureaucratic collectivism
- Burghart Schmidt
- Buridan's ass
- Burleigh Taylor Wilkins
- Burrhus Frederic Skinner
- Burton Dreben
- Business ethics
- Buttered cat paradox
- By any means necessary
- Byzantine philosophy
- Byzantine rhetoric
- Byzantinism
C
- C. Anthony Anderson
- C. D. Broad
- C. E. M. Joad
- C. I. Lewis
- C. Lloyd Morgan
- C. S. Lewis
- C. S. Lewis bibliography
- C. Stephen Evans
- C. T. K. Chari
- C. A. J. Coady
- Cabbala
- Café Philosophique
- Cahal Daly
- Cai Yuanpei
- Caigentan
- Cairo Declaration on Human Rights in Islam
- Cajetan
- Calcidius
- Calculus
- Calculus of structures
- Calculus ratiocinator
- Calippus of Syracuse
- Callicles
- Calliphon
- Calliphon of Croton
- Callippus
- Callistratus (sophist)
- Calvin Normore
- Calvin Seerveld
- Calvinism
- Camas Bookstore and Infoshop
- Cambridge change
- Cambridge Philosophical Society
- Cambridge Platonism
- Cambridge Platonists
- Camera del Lavoro
- Camera obscura
- Camilo Cienfuegos
- Camp (style)
- Canadian Journal of Philosophy
- Canadian Society for History and Philosophy of Mathematics
- Candace Vogler
- Candide
- Candrakīrti
- Canonical form (Boolean algebra)
- Cantor's paradox
- Cantor's theorem
- Capacity
- Capital accumulation
- Capital punishment
- Capital, Volume I
- Capitalism
- Capitalism: The Unknown Ideal
- Capitalist mode of production
- Capitalist realism
- Cappadocian Fathers
- Carceral state
- Cardinal Mercier Prize for International Philosophy
- Cardinal utility
- Cardinal virtues
- Cardinality
- Care
- Care Not Killing
- Carew Arthur Meredith
- Cargo cult science
- Carl Cohen
- Carl Dahlhaus
- Carl Elliott (philosopher)
- Carl Friedrich Gauss
- Carl Friedrich von Weizsäcker
- Carl G. Hempel
- Carl Ginet
- Carl Gustav Carus
- Carl Gustav Hempel
- Carl Gustav Jung
- Carl Hempel
- Carl Joachim Friedrich
- Carl Jung
- Carl Linnaeus
- Carl Mitcham
- Carl Schmitt
- Carl Stumpf
- Carl von Linnaeus
- Carlo Cattaneo
- Carlo Lottieri
- Carlo Michelstaedter
- Carlo Penco
- Carlo Rosselli
- Carlo Tresca
- Carlos Bernardo González Pecotche
- Carlos Brandt
- Carlos Castrodeza
- Carlos Castaneda
- Carlos Cirne Lima
- Carlos Santiago Nino
- Carlos Vaz Ferreira
- Carmen Laforet
- Ramsey sentence
- Carneades
- Carneiscus
- Carol Gilligan
- Caroline Joan S. Picart
- Carolingian Renaissance
- Carolus Sigonius
- Carolyn Merchant
- Carsun Chang
- Cartesian anxiety
- Cartesian circle
- Cartesian demon
- Cartesian doubt
- Cartesian dualism
- Cartesian materialism
- Cartesian Meditations
- Cartesian Other
- Cartesian product
- Cartesian Self
- Cartesian skepticism
- Cartesian theater
- Cartesianism
- Cārvāka
- Carveth Read
- Case-based reasoning
- Casimir Lewy
- Caspar Isenkrahe
- Cassius Longinus (philosopher)
- Casuistry
- Cat's Cradle
- Catch-22 (logic)
- Catechism of a Revolutionary
- Categoriae decem
- Categorical
- Categorical imperative
- Categorical logic
- Categorical proposition
- Categorical theory
- Categoricity
- Categories (Aristotle)
- Categories (Peirce)
- Categories of the understanding
- Categorization
- Category (Kant)
- Category (philosophy)
- Category mistake
- Category of being
- Category theory
- Catharine Macaulay
- Catharsis
- Catherine Clément
- Catherine Elgin
- Catherine Malabou
- Catherine of Siena
- Catherine Perret
- Catherine Trotter
- Catherine Trotter Cockburn
- Catholic guilt
- Catholic Probabilism
- Catius
- Cato Maior de Senectute
- Cato the Elder
- Cato the Younger
- Catonism
- Causa sui
- Causal-historical theory of reference
- Causal adequacy principle
- Causal chain
- Causal closure
- Causal decision theory
- Causal determinism
- Causal diagram
- Causal Markov condition
- Causal relation
- Causal theory of proper names
- Causal theory of reference
- Causalism
- Causality
- Causality loop
- Causation (law)
- Causative verb
- Cause
- Cavalcante de' Cavalcanti
- Cebes
- Celestial spheres
- Célestin Bouglé
- Celia Green
- Celine's laws
- Cellular automaton
- Celsus
- Cemal Yildirim
- Center Leo Apostel for Interdisciplinary Studies
- Centre de recherche et de documentation sur Hegel
- Centre for Applied Ethics
- Centre for Applied Philosophy and Public Ethics (CAPPE)
- Centre for History and Philosophy of Science, University of Leeds
- Cercidas
- Cercops
- Certainty
- César Chesneau Dumarsais
- César Dávila Andrade
- Cesare Beccaria
- Cesare Cremonini (philosopher)
- Ceteris paribus
- CH
- Ch'i
- Ch'ien Mu
- Chaeremon of Alexandria
- Chaerephon
- Chaeron of Pellene
- Chaïm Perelman
- Chain of events
- Chaldean Oracles
- Chamaeleon (philosopher)
- Chanakya
- Chance (Ancient Greek concept)
- Chandragomin
- Change
- Chantal Maillard
- Chao Cuo
- Chaos
- Chaos theory
- Chaotic system
- Character Strengths and Virtues (book)
- Character structure
- Character traits
- Characteristica universalis
- Chariot Allegory
- Charismatic authority
- Charity (practice)
- Charity (virtue)
- Charity International
- Charles A. Moore
- Charles Babbage
- Charles Batteux
- Charles Bernard Renouvier
- Charles Blount (deist)
- Charles Bonnet
- Charles Butterworth (philosopher)
- Charles Carroll Everett
- Charles Darwin
- Charles de Secondat, baron de Montesquieu
- Charles Fourier
- Charles François d'Abra de Raconis
- Charles Frankel
- Charles Fremont Dight
- Charles Graves (bishop)
- Charles Hartshorne
- Charles Kay Ogden
- Charles L. Stevenson
- Charles Leonard Hamblin
- Charles Leslie Stevenson
- Charles Louis de Secondat, Baron de Montesquieu
- Charles Lutwidge Dodgson
- Charles Malato
- Charles Maurras
- Charles Morris, Baron Morris of Grasmere
- Charles Parsons (philosopher)
- Charles Renouvier
- Charles Robert Darwin
- Charles Sanders Peirce
- Charles Sanders Peirce bibliography
- Charles Secrétan
- Charles Stevenson
- Charles Taylor (philosopher)
- Charles W. Morris
- Charles Waddington (philosopher)
- Charles Winquist
- Charlotte Perkins Gilman
- Charlotte Wilson
- Charmadas
- Charmides (dialogue)
- Charter for Compassion
- Chastity
- Chatral Rinpoche
- Chauncey Wright
- Chaz Bufe
- Chemism
- Chen Chung-hwan
- Chen Daqi
- Chen Duxiu
- Chen Hongmou
- Cheng Hao
- Cheng Yi (philosopher)
- Chernoe Znamia
- Cherry picking (fallacy)
- Cheung Kam Ching
- Chia I
- Chia Yi
- Chicago school (mathematical analysis)
- Chicken or the egg
- Chih
- Chih-I
- Chih Tun
- Child labour
- China brain
- Chinese Classics
- Chinese Legalism
- Chinese philosophy
- Chinese room
- Chinese world
- Chinoiserie
- Chinul
- Chion of Heraclea
- Chivalry
- Chöd
- Choe Chung
- Chögyam Trungpa
- Choice
- Choice-supportive bias
- Choice sequence
- Chomsky hierarchy
- Chomsky normal form
- Choosing
- Chora
- Choricius of Gaza
- Chovot ha-Levavot
- Chrematistics
- Chris Bobonich
- Chris Crass
- Chris Huebner
- Christiaan Cornelissen
- Christiaan Huygens
- Christian anarchism
- Christian August Crusius
- Christian de Quincey
- Christian Discourses
- Christian ethics
- Christian existentialism
- Christian Friedrich Hebbel
- Christian Garve
- Christian Hermann Weisse
- Christian humanism
- Christian Kabbalah
- Christian materialism
- Christian philosophy
- Christian Realism
- Christian Thomasius
- Christian von Ehrenfels
- Christian Wolff (philosopher)
- Christianity and environmentalism
- Christine Buci-Glucksmann
- Christine de Pizan
- Christine Korsgaard
- Christine Ladd-Franklin
- Christofascism
- Christological argument
- Christology
- Christoph Gottfried Bardili
- Christoph Meiners
- Christoph Schrempf
- Christoph von Sigwart
- Christopher Cherniak
- Christopher D. Green
- Christopher Fynsk
- Christopher Jacob Boström
- Christopher Janaway
- Christopher Norris (critic)
- Christopher Peacocke
- Christopher Potter (author)
- Christopher R. Phillips
- Christos Yannaras
- Chronocentrism
- Chronological snobbery
- Chronology protection conjecture
- Chrysanthius
- Chrysippus
- Chrysorrhoas
- Chu Anping
- Chu Hsi
- Chuck Munson
- Chumbawamba
- Chün-tzu
- Chung-ying Cheng
- Chung-yung
- Chung Yung
- Chunyu Kun
- Church's theorem
- Church's thesis
- Church–Turing thesis
- Church–Turing–Deutsch principle
- Church fathers
- Cicero
- Cienfuegos press
- Cincinnati Time Store
- Cindy Milstein
- Cinema 1: The Movement Image
- Cipriano Mera
- Circle of Tchaikovsky
- Circular cause and consequence
- Circular definition
- Circular reasoning
- Circumcision controversies
- Citationality
- Citizen Cyborg
- Citizenship
- City of God (book)
- Civic humanism
- Civic virtue
- Civics
- Civil discourse
- Civil disobedience
- Civil liberties
- Civil rights
- Civil society
- Civil union
- Civilization and Its Discontents
- Claim right
- Clairvoyance
- Clare W. Graves
- Clarembald of Arras
- Clarence Irving Lewis
- Clarity of scripture
- Clarity test
- Class (philosophy)
- Class collaboration
- Class consciousness
- Class struggle
- Classical conditioning
- Classical liberalism
- Classical logic
- Classical mechanics
- Classical Realism
- Classical republicanism
- Classical theism
- Classicism
- Classics
- Classification of the sciences (Peirce)
- Classificatory disputes about art
- Classless society
- Claude-Arien Helvetius
- Claude Adrien Helvétius
- Claude Buffier
- Claude Henri de Rouvroy, comte de Saint-Simon
- Claude Lefort
- Claude Lévi-Strauss
- Claude Lévi-Strauss
- Claude Tresmontant
- Claudio Canaparo
- Claudio Ulpiano
- Claudius Maximus
- Claus Emmeche
- Clause (logic)
- Cleanliness
- Cleanthes
- Clearchus of Soli
- Cleinias of Tarentum
- Clémence Royer
- Clemens Baeumker
- Clemens Timpler
- Clement Greenberg
- Clement of Alexandria
- Clément Rosset
- Cleobulus
- Cleomedes
- Cleomenes the Cynic
- Clerical fascism
- Clerical philosophers
- Clericalism
- Clifford Harper
- Clifford Williams (academic)
- Climate ethics
- Clinamen
- Clinical death
- Clinical equipoise
- Clinomachus
- Clitomachus (philosopher)
- Clitophon (dialogue)
- Clive Bell
- Clive Staples Lewis
- CLODO
- Cloning
- Close reading
- Closed circle
- Closed concept
- Closed formula
- Closed loop
- Closed sentence
- Closed world assumption
- Cloudesley
- Clustering illusion
- Co-premise
- Coase theorem
- Code (law)
- Coercion
- Cogency
- Cogito (magazine)
- Cogito ergo sum
- Cognition
- Cognitive architecture
- Cognitive bias
- Cognitive closure (philosophy)
- Cognitive description
- Cognitive development
- Cognitive dissonance
- Cognitive liberty
- Cognitive map
- Cognitive meaning
- Cognitive module
- Cognitive neuroscience
- Cognitive ontology
- Cognitive psychology
- Cognitive relativism
- Cognitive revolution
- Cognitive science
- Cognitive science of mathematics
- Cognitive synonymy
- Cognitivism (ethics)
- Coherence (philosophical gambling strategy)
- Coherence theory of truth
- Coherentism
- Coimbra commentaries
- Coimbra group
- Cointerpretability
- Colin Howson
- Colin McGinn
- Colin Murray Turbayne
- Colin Wilson
- Collapse (journal)
- Collapse theories (quantum mechanics)
- Collective belief
- Collective memory
- Collective responsibility
- Collective unconscious
- Collectivism and individualism
- Collectivist anarchism
- Collectivity
- Collège international de philosophie
- Collegium Conimbricense
- Colloque Walter Lippmann
- Colloquial language
- Color
- Color Field
- Color realism (philosophy)
- Colotes
- Combinational logic
- Combinatory logic
- Comedy
- Comenius
- Comité Consultatif National d'Ethique
- Commensurability (ethics)
- Commensurability (philosophy of science)
- Commentaria in Aristotelem Graeca
- Commentaries on Aristotle
- Commentaries on Plato
- Commission of Anarchist Relations
- Committee for the Scientific Examination of Religion
- Commodification
- Commodity (Marxism)
- Commodity fetishism
- Commodity form theory
- Common good
- Common Ground Collective
- Common knowledge
- Common knowledge (logic)
- Common law
- Common ownership
- Common rule
- Common sense
- Common sense and the Diallelus
- Common sense reasoning
- Commonsense reasoning
- Communication
- Communication theory
- Communicative action
- Communicative rationality
- Communism
- Communitarianism
- Community
- Community arts
- Communization
- Compactness
- Compactness theorem
- Comparatio
- Compassion
- Compassionate conservatism
- Compatibilism
- Compatibilism and incompatibilism
- Compensation (essay)
- Compensationism
- Completeness (logic)
- Completeness theorem
- Complexity
- Composition (logical fallacy)
- Composition of Causes
- Compositionality
- Compossibility
- Compossible
- Compound question
- Comprehension (logic)
- Compromise
- Computability
- Computability logic
- Computable
- Computational complexity
- Computational epistemology
- Computational humor
- Computational theories of mind
- Computational theory of mind
- Computer ethics
- Computer modeling
- Computer program
- Computer science
- Computer theory
- Computers
- Comtism
- Conatus
- Concept
- Concept and object
- Concepts
- Conceptual analysis
- Conceptual art
- Conceptual definition
- Conceptual framework
- Conceptual metaphor
- Conceptual model
- Conceptual necessity
- Conceptual role semantics
- Conceptual scheme
- Conceptual system
- Conceptualism
- Concerned Philosophers for Peace
- Conciliarism
- Conciliation
- Concluding Unscientific Postscript to Philosophical Fragments
- Conclusive evidence
- Concord School of Philosophy
- Concrescence
- Concretion
- Concretism
- Concupiscence
- Condemnations of 1210–1277
- Condensed detachment
- Conditio sine qua non
- Condition of possibility
- Conditional probability
- Conditional proof
- Conditioned disjunction
- Condorcet
- Condorcet winner
- Conduct
- Confederación Nacional del Trabajo
- Confederalism
- Confédération nationale du travail
- Configurations
- Confirmation
- Confirmation bias
- Confirmation holism
- Confirmational holism
- Conflict between good and evil
- Conflict of interest
- Conflict theory
- Conformism
- Confucian Analects
- Confucian philosophy
- Confucian view of marriage
- Confucianism
- Confucianism in Indonesia
- Confucius
- Confusion of the inverse
- Congruence bias
- Conimbricenses
- Conjecture
- Conjectures and Refutations
- Conjunction elimination
- Conjunction fallacy
- Conjunction introduction
- Conjunctive grammar
- Conjunctive normal form
- Connectionism
- Connectives
- Connexive logic
- Connotation
- Conscience
- Conscience clause (medical)
- Conscious automatism
- Conscious mind
- Consciousness
- Consciousness-only
- Consciousness and Cognition
- Consciousness Explained
- Consensual crime
- Consensual living
- Consensus
- Consensus decision-making
- Consensus democracy
- Consensus reality
- Consensus theory of truth
- Consent
- Consent theory
- Consequence relation
- Consequent
- Consequentia mirabilis
- Consequentialism
- Consequentialist justifications of the state
- Consequentialist libertarianism
- Conservation (ethic)
- Conservation biology
- Conservation ethic
- Conservation movement
- Conservatism
- Considerations on Representative Government
- Consilience
- Consistent life ethic
- Consolatio Literary Genre
- Consolation of Philosophy
- Constance Naden
- Constant capital
- Constant sum game
- Constantin Brunner
- Constantin Noica
- Constantin Rădulescu-Motru
- Constantin Schifirneţ
- Constantin Stere
- Constantine of Kostenets
- Constantinos Speras
- Constitution
- Constitution of the Athenians (Aristotle)
- Constitution of the Athenians (Pseudo-Xenophon)
- Constitutional law
- Constitutional right
- Constitutionalism
- Construct (philosophy of science)
- Constructible universe
- Constructive dilemma
- Constructive empiricism
- Constructive realism
- Constructivism (art)
- Constructivism (mathematics)
- Constructivist epistemology
- Constructivist Foundations
- Consubstantiation
- Consumerism
- Consumption of fixed capital
- Container (Type theory)
- Container space
- Containment
- Contemporary anarchism
- Contemporary Islamic philosophy
- Contemporary philosophy
- Contemporary Political Theory
- Contemporary Pragmatism
- Contemporary Whitehead Studies
- Contentment
- Context-free grammar
- Context-free language
- Context-sensitive grammar
- Context-sensitive language
- Context principle
- Contextual empiricism
- Contextualism
- Contiguity
- Continental philosophy
- Contingency
- Contingency (philosophy)
- Contingency, irony, and solidarity
- Contingent
- Continuity (fiction)
- Continuum fallacy
- Continuum hypothesis
- Continuum of Humanist Education
- Contra Celsum
- Contra principia negantem disputari non potest
- Contract theory
- Contractarianism
- Contractualism
- Contradiction
- Contradictions
- Contraposition
- Contraposition (traditional logic)
- Contrapositive
- Contrast effect
- Contrast theory of meaning
- Contrastivism
- Contributions to Philosophy (From Enowning)
- Contributory value
- Control (management)
- Controversy over Cantor's theory
- Convention (norm)
- Convention T
- Conventionalism
- Convergence (series)
- Conversational implicature
- Converse accident
- Converse implication
- Converse nonimplication
- Converse relation
- Conversion (logic)
- Convivio
- Convolution (computer science)
- Cool (aesthetic)
- Cooperation
- Cooperative federalism
- Cooperative principle
- Coordination problem
- Coordinative definition
- Copernican principle
- Copernican Revolution
- Copernican Revolution (metaphor)
- Copula (linguistics)
- Cora Diamond
- Core ontology
- Corelative
- Coriscus of Scepsis
- Corliss Lamont
- Cornel West
- Cornelian dilemma
- Cornelio Fabro
- Cornelis Willem Opzoomer
- Cornelius Castoriadis
- Cornelius de Pauw
- Cornell realism
- Corollary
- Corporate behaviour
- Corporate crime
- Corporate nationalism
- Corporate social responsibility
- Corporate statism
- Corporatism
- Corpus Aristotelicum
- Correlation does not imply causation
- Correlative-based fallacies
- Correspondence theory of truth
- Corresponding conditional (logic)
- Corroboration
- Corruption (philosophical concept)
- Cosimo Boscaglia
- Cosmic consciousness
- Cosmic pluralism
- Cosmicism
- Cosmocentrism
- Cosmogony
- Cosmographia (Bernard Silvestris)
- Cosmological argument
- Cosmology
- Cosmology (metaphysics)
- Cosmopolitanism
- Cosmos
- Cosmotheology
- Cost-benefit analysis
- Costanzo Preve
- Costas Douzinas
- Council communism
- Count Lev Nikolaevich Tolstoi
- Count noun
- Richard von Coudenhove-Kalergi
- Countable
- Counter-Enlightenment
- Counterargument
- Counterexample
- Counterfactual conditional
- Counterfactual conditionals
- Counterfactuals
- Counterinduction
- Counterintuitive
- Counterpart theory
- Counting
- Coup d'État: A Practical Handbook
- Courage
- Course in General Linguistics
- Covering-law model
- Covering law model
- Cowardice
- Cowley Club
- CPNSS
- Craig's theorem
- Craig reduct
- Crantor
- Crass
- Crates of Athens
- Crates of Mallus
- Crates of Thebes
- Cratippus of Pergamon
- Cratylism
- Cratylus
- Cratylus (dialogue)
- Creatio ex materia
- Creatio ex nihilo
- Creation myth
- Creationism
- Creative accounting
- Creative destruction
- Creative Evolution (book)
- Creativity
- Credibility
- Credo quia absurdum
- Credo quia absurdum est
- Credo ut intelligam
- Crescens the Cynic
- Cressida Heyes
- Cries and Whispers
- Crime
- Crime against humanity
- Crime and punishment
- Crime and Punishment
- CrimethInc.
- CrimethInc. Guerilla Film Series, Volume One
- CrimethInc. N©! license
- CrimethInc. publications
- Criminal justice
- Crinis
- Crispin Sartwell
- Crispin Wright
- Cristina Bicchieri
- Cristoforo Landino
- Criteria of truth
- Criterion
- Critias (dialogue)
- Critic
- Critica Sociale
- Critical discourse analysis
- Critical historiography
- Critical Language Awareness
- Critical legal studies
- Critical Mass
- Critical pedagogy
- Critical philosophy
- Critical race theory
- Critical rationalism
- Critical reading
- Critical realism
- Critical social thought
- Critical theory
- Critical thinking
- Critical vocabulary
- Criticism of capitalism
- Criticism of Christianity
- Criticism of Hinduism
- Criticism of Islam
- Criticism of Jesus
- Criticism of Judaism
- Criticism of monotheism
- Criticism of postmodernism
- Criticism of religion
- Criticism of the Bible
- Criticism of the Catholic Church
- Criticism of the Latter Day Saint movement
- Criticism of the Qur'an
- Criticisms of anarchism
- Criticisms of electoralism
- Critique
- Critique (Journal of Socialist Theory)
- Critique of Cynical Reason
- Critique of Dialectical Reason
- Critique of Hegel's Philosophy of Right
- Critique of ideology
- Critique of Judgement
- Critique of Practical Reason
- Critique of Pure Reason
- Critiques of Slavoj Žižek
- Crito
- Critolaus
- Cronaca Sovversiva
- Cronius the Pythagorean
- Crooked Timber
- Crucial experiment
- Cruelty
- Crusties
- Crypto-anarchism
- Crypto-fascism
- Crystallized self
- CTheory
- Cuban Libertarian Movement
- Cubism
- Cultural bias
- Cultural evolution
- Cultural hegemony
- Cultural history
- Cultural identity
- Cultural influence of Plato's Republic
- Cultural materialism (anthropology)
- Cultural materialism (cultural studies)
- Cultural nationalism
- Cultural relativism
- Cultural studies
- Culture
- Culture of life
- Culture of the Song Dynasty
- Cum hoc ergo propter hoc
- Cura te ipsum
- Curie
- Curiosity
- Curious George Brigade
- Curry's paradox
- Curt John Ducasse
- Curve fitting problem
- Cusa
- Cusanus
- Cut-elimination theorem
- Cuteness
- Cyberethics
- Cybernetics
- Cyborg theory
- Cyclic history
- Cynic epistles
- Cynical Realism
- Cynicism (contemporary)
- Cynicism (philosophy)
- Cyphernomicon
- Cyrenaics
- Cyril of Alexandria
- Cyropaedia
- Czech philosophy
- Czesław Lejewski
- Czesław Znamierowski
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- 14th Dalai Lama
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- 1649 in philosophy
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- 19th-century philosophy
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A
- A-series and B-series
- A Buyer's Market
- A Calendar of Wisdom
- A Conflict of Visions
- A Contribution to the Critique of Political Economy
- A Defence of Common Sense
- A Defense of Abortion
- A Dissertation on Liberty and Necessity, Pleasure and Pain
- A Few Words on Non-Intervention
- A Fórmula de Deus
- A fortiori argument
- A General View of Positivism
- A Grief Observed
- A Guide for the Perplexed
- A Happy Death
- A History of God
- A History of Murphy's Law
- A History of Philosophy (Copleston)
- A History of Western Philosophy
- A las Barricadas
- A Legend of Old Egypt
- A Letter Concerning Toleration
- A maiore ad minus
- A Mathematician's Apology
- A Message from the Emperor
- A minore ad maius
- A New Era of Thought
- A New Model of the Universe
- A New Philosophy of Society: Assemblage Theory and Social Complexity
- A New Refutation of Time
- A Philosophical Enquiry into the Origin of Our Ideas of the Sublime and Beautiful
- A posteriori
- A priori (philosophy)
- A priori and a posteriori
- A Salty Piece of Land
- A Scanner Darkly
- A Secular Humanist Declaration
- A Short History of Chinese Philosophy
- A System of Logic
- A Thousand Plateaus
- A Thousand Years of Nonlinear History
- A Treatise Concerning the Principles of Human Knowledge
- A Treatise of Human Nature
- A Vindication of Natural Society
- A Vindication of the Rights of Men
- A Vindication of the Rights of Woman
- A Voyage to Arcturus
- A. A. Long
- A. A. Luce
- A. C. Ewing
- A. C. Grayling
- A. D. Gordon
- A. H. Almaas
- A. H. Armstrong
- A. J. Baker (philosopher)
- A. V. Dicey
- A. W. Benn
- A. P. Martinich
- A. R. Natarajan
- Ab ovo
- Abacus logic
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- Abandonment (existentialism)
- Abas (sophist)
- Abbasgulu Bakikhanov
- Abd al-Karīm ibn Hawāzin al-Qushayri
- Abd al-Rahman al-Kawakibi
- Abd al-Rahman Ibn Khaldun
- Abdallah ibn Yasin
- Abdel-Halim Mahmoud
- Abdel Rahman Badawi
- Abdel Wahab Elmessiri
- Abderites
- Abdoldjavad Falaturi
- Abdolkarim Soroush
- Abductive logic programming
- Abductive reasoning
- Abductive validation
- Abdullah Yusuf Azzam
- Abdurrahman Ibn Khaldun
- Abdurrahmān Ibn Khaldūn
- Abel Paz
- Abhayakaragupta
- Abhidhamma Pitaka
- Abhidharma
- Abhinavagupta
- Abilene paradox
- Abimael Guzmán
- Abjection
- Abjunction
- Abner of Burgos
- Abner Shimony
- Abolishing the Borders from Below
- Abortion
- Abortion debate
- Aboutness
- Abraham Abigdor
- Abraham Abulafia
- Abraham bar Hiyya
- Abraham ben Moses Maimon
- Abraham ben Moses Maimonides
- Abraham Cohen de Herrera
- Abraham Edel
- Abraham ibn Daud
- Abraham Ibn Daud
- Abraham ibn Ezra
- Abraham Ibn Ezra
- Abraham Isaac Kook
- Abraham Joshua Heschel
- Abraham Kaplan
- Abraham Kovoor
- Abraham Leon
- Abraham Robinson
- Abraham Tucker
- Abraham Yagel
- Abraham Yehudah Khein
- Abram Deborin
- Absolute (philosophy)
- Absolute atheism
- Absolute idealism
- Absolute infinite
- Absolute space
- Absolute theory
- Absolute threshold
- Absolute time
- Absolute truth
- Abstinence
- Abstract art
- Abstract entity
- Abstract expressionism
- Abstract Illusionism
- Abstract Imagists
- Abstract labour and concrete labour
- Abstract object
- Abstract objects
- Abstract particulars
- Abstract process
- Abstract semantic graph
- Abstraction
- Abstraction (philosophy)
- Abstractionism
- Absurdism
- Abu'l Hasan Muhammad Ibn Yusuf al-'Amiri
- Abu'l Walid Muhammad Ibn Rushd
- Abu 'Ali al-Husayn Ibn Sina
- Abu al-Hakam al-Kirmani
- Abu al-Hasan al-Ash'ari
- Abu Bakr Ibn Bajja
- Abu Bakr Ibn Bājja
- Abu Bakr Ibn Ţufayl
- Abu Bakr Muhammad Ibn Tufayl
- Abu Bakr Muhammad Ibn Yahya Ibn as-Say'igh Ibn Bajja
- Abu Bakr Muhammad Ibn Zakariyya' al-Razi
- Abu Hamid al-Ghazali
- Abu Hamid Muhammad al-Ghazali
- Abū Hayyān al-Tawhīdī
- Abu Mansur Maturidi
- Abu Muhammad 'Ali Ibn Hazm
- Abu Nasr al-Farabi
- Abū Nasr al-Fārābī
- Abu Rayhan Biruni
- Abu Sulayman al-Sijistani
- Abu Sulayman Muhammad al-Sijistani
- Abu Tahir Marwazi
- Abu Yaqub Sijistani
- Abu Yusuf Ya'qub ibn Ishaq al-Kindi
- Abul Ala Maududi
- Academic art
- Academic authorship
- Academic freedom
- Academic skepticism
- Academy
- Acatalepsy
- Accademia degli Infiammati
- Accent
- Acceptance
- Accessibility
- Accessibility relation
- Accident
- Accident (fallacy)
- Accident (philosophy)
- Accidental necessity
- Accidental properties
- Accidental property
- Accidentalism
- Accidie
- Accountability
- Accountant-client privilege
- Accounting ethics
- Accounting reform
- Accumulation by dispossession
- Acharya Hemachandra
- Achieving Our Country
- Achille Gagliardi
- Achille Varzi (philosopher)
- Achilles paradox
- Achintya Bheda Abheda
- Acosmism
- Acquaintance
- Acquiescence bias
- Acquired taste
- Acrasia
- Acratas
- Acrion
- Act utilitarianism
- Acting Out (book)
- Action (philosophy)
- Action at a distance
- Action Philosophers!
- Action theory (philosophy)
- Action verb
- Active citizenship
- Active intellect
- Actor–observer bias
- Acts of Literature
- Acts of the Apostles
- Actual idealism
- Actual Idealism
- Actual infinite
- Actual infinity
- Actualism
- Actualist
- Actuality
- Actuel Marx
- Actus et potentia
- Actus primus
- Actus purus
- Acumenus
- Acyutananda
- Ad captandum
- Ad feminam
- Ad hoc
- Ad hoc hypothesis
- Ad hominem
- Ad hominem argument
- Ad infinitum
- Ad nauseam
- Ada Albrecht
- Adalbertus Ranconis de Ericinio
- Adam Burski
- Adam de Buckfield
- Adam de Wodeham
- Adam Ferguson
- Adam Ignacy Zabellewicz
- Adam Karl August von Eschenmayer
- Adam Mahrburg
- Adam Morton
- Adam Müller
- Adam of Łowicz
- Adam Parvipontanus
- Adam Pulchrae Mulieris
- Adam Schaff
- Adam Smith
- Adam Steuart
- Adam Tanner (mathematician)
- Adam Weishaupt
- Adam Wodeham
- Adam Zachary Newton
- Adamantios Korais
- Adamites
- Adaptation
- Adaptive bias
- Adaptive grammar
- Adaptive representation
- Adaptive system
- Addiction
- Addison Webster Moore
- Addition (logic)
- Adela Cortina
- Adelard of Bath
- Adevism
- Adi Ophir
- Adi Sanakara Philosophy
- Adi Shankara
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- Adolf Grünbaum
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- Aesthetics
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- Aeterni Patris
- Aether
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- African philosophy
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- After Many a Summer
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- Against Civilization: Readings and Reflections
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- Age of Enlightenment
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- Ahistoricism
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- Alexander Neckham
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- Algazel
- Algebra
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- Algernon Charles Swinburne
- Algorithm
- Alhazen
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- Alienation
- Alison Wylie
- All
- All About Love: New Visions
- All and Everything
- All horses are the same color
- All men are created equal
- All That Is Solid Melts into Air
- All Truth Is God's Truth
- Allan Antliff
- Allan Bloom
- Allan Gibbard
- Allan Gotthelf
- Allan Ramsay (1713-1784)
- Allegory of the cave
- Allegory of the Cave
- Allen Buchanan
- Alois Riehl
- Alon Ben-Meir
- Alonso Gutiérrez
- Alonzo Church
- Aloys Hirt
- Alpha et Omega
- Alphabet of human thought
- Alphonso Lingis
- Altered state of consciousness
- Alterity
- Alternative denial
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- Alternative Media Project
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- Altheides
- Altruism
- Alvin Goldman
- Alvin Plantinga
- Always already
- Ama-gi
- Amadeo Bordiga
- Amafinius
- Amakasu Incident
- Amalric of Bena
- Amartya K. Sen
- Amartya Sen
- Ambiguity
- Ambiguity effect
- Ambrose
- Ambrosius Theodosius Macrobius
- Amelius
- America at the Crossroads
- American Bar Association Model Code of Professional Responsibility
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- American Craftsman
- American Empire (style)
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- American Philosophical Society
- American philosophy
- American realism
- American Society for Political and Legal Philosophy
- Amerika (novel)
- Amicus Plato, sed magis amica veritas
- Amilcar Cabral
- Amílcar Cabral
- Amilcare Cipriani
- Ammon Hennacy
- Ammonius Hermiae
- Ammonius of Alexandria (Christian philosopher)
- Ammonius of Athens
- Ammonius Saccas
- Amoralism
- Amorality
- Amos Bronson Alcott
- Amour-propre
- Amour de soi
- Amphibology
- Amphiboly
- Amsterdam Declaration
- Amy Gutmann
- Amynomachus
- An Enquiry concerning Human Understanding
- An Enquiry Concerning Human Understanding
- An Enquiry Concerning the Principles of Morals
- An Essay Concerning Human Understanding
- An Essay on the History of Civil Society
- An Essay on the Principle of Population
- An Honest Thief
- An Hyang
- An Intelligent Person's Guide to Atheism
- An Occurrence at Owl Creek Bridge
- An Sich
- Anacharsis
- Anāgāmi
- Analects
- Analects of Confucius
- Analogy
- Analogy of the divided line
- Analysis
- Analysis (journal)
- Analysis (philosophy)
- Analysis paralysis
- Analytic philosophy
- Analytic-synthetic distinction
- Analytic and synthetic knowledge
- Analytic and synthetic statements
- Analytic ethics
- Analytic hierarchy
- Analytic jurisprudence
- Analytic knowledge
- Analytic Marxism
- Analytic philosophy
- Analytic proof
- Analytic proposition
- Analytic reasoning
- Analytical hierarchy
- Analytical jurisprudence
- Analytical philosophy
- Analytical psychology
- Analytical Thomism
- Anamnesis (philosophy)
- Anamorphosis
- Anan ben David
- Ānanda
- Ananda Coomaraswamy
- Anandamaya kosha
- Anandavardhana
- Anangeon
- Ananke
- Anantarika-karma
- Anaphor
- Anaphora
- Anarch (sovereign individual)
- Anarcha-feminism
- Anarchism
- Anarchism and anarcho-capitalism
- Anarchism and animal rights
- Anarchism and capitalism
- Anarchism and Friedrich Nietzsche
- Anarchism and Islam
- Anarchism and Marxism
- Anarchism and nationalism
- Anarchism and the arts
- Anarchism and violence
- Anarchism in Africa
- Anarchism in America (film)
- Anarchism in Asia
- Anarchism in Australia
- Anarchism in Brazil
- Anarchism in Canada
- Anarchism in China
- Anarchism in Cuba
- Anarchism in England
- Anarchism in France
- Anarchism in Greece
- Anarchism in Iceland
- Anarchism in India
- Anarchism in Ireland
- Anarchism in Israel
- Anarchism in Italy
- Anarchism in Japan
- Anarchism in Korea
- Anarchism in Mexico
- Anarchism in Poland
- Anarchism in Russia
- Anarchism in Spain
- Anarchism in Sweden
- Anarchism in the United States
- Anarchism in Turkey
- Anarchism in Ukraine
- Anarchism in Vietnam
- Anarchism without adjectives
- Anarchism: A Documentary History of Libertarian Ideas
- Anarchist Black Cross
- Anarchist Black Cross Federation
- Anarchist Black Cross Network
- Anarchist Bookfair
- Anarchist Catalonia
- Anarchist communism
- Anarchist Exclusion Act
- Anarchist Federation (Britain and Ireland)
- Anarchist law
- Anarchist Manifesto
- Anarchist People of Color
- Anarchist schools of thought
- Anarchist St. Imier International
- Anarchist Studies
- Anarchist symbolism
- Anarchist terminology
- Anarchistic free school
- Anarchists (film)
- Anarchists Against the Wall
- Anarcho-capitalism
- Anarcho-capitalism and minarchism
- Anarcho-capitalist literature
- Anarcho-capitalist symbolism
- Anarcho-pacifism
- Anarcho-primitivism
- Anarcho-punk
- Anarcho-syndicalism
- Anarcho-Syndicalism (book)
- Anarcho-Syndicalist Review
- Anarcho-syndicalist symbolism
- Anarchy
- Anarchy (book)
- Anarchy Alive!
- Anarchy Archives
- Anarchy Comics
- Anarchy in the Age of Dinosaurs
- Anarchy Magazine
- Anarchy, State, and Utopia
- Anarchy: A Journal of Desire Armed
- Anarky
- Anarky (comic book)
- Anat Biletzki
- Anathon Aall
- Anatoly Lunacharsky
- Anatta
- Anava
- Anaxagoras
- Anaxarchus
- Anaxilaus
- Anaximander
- Anaximenes of Miletus
- Ancestral
- Ancestral relation
- Anchoring
- Ancient commentators project
- Ancient Greek philosophy
- Ancient philosophy
- Ancient skepticism
- Ancient Wisdom, Modern World
- And you are lynching Negroes
- Anders Chydenius
- Anders Nygren
- Anders Vilhelm Lundstedt
- Ando Shoeki
- André-François Deslandes
- André-Marie Ampère
- André Comte-Sponville
- André Glucksmann
- André Gorz
- André Malet (philosopher)
- André Malraux
- André of Neufchâteau
- Andrea Bonomi
- Andrea Cesalpino
- Andreas Kinneging
- Andreas Speiser
- Andrei Andreevich Markov
- Andrei Marga
- Andrej Grubacic
- Andres Luure
- Andrés Ortiz-Osés
- Andrew Baxter
- Andrew Bernstein (philosopher)
- Andrew Feenberg
- Andrew Janiak
- Andrew of Cornwall
- Andrew Pyle (philosopher)
- Andrew Seth Pringle-Pattison
- Andries Mac Leod
- Androcentrism
- Androcydes (Pythagorean)
- Android epistemology
- Andronicus of Rhodes
- Andrzej Mostowski
- Andrzej Towiański
- Andy Blunden
- Andy Clark
- Andy Warhol
- Anekantavada
- Ángel Rama
- Angelaki
- Angeli (novel)
- Angelo Galli
- Anger
- Angie Hobbs
- Anglo-Japanese style
- Angst
- Anguish
- Angus Taylor (philosopher)
- Anima mundi
- Anima mundi (spirit)
- Animal consciousness
- Animal Experimentation: Opposing Viewpoints
- Animal language
- Animal Liberation (book)
- Animal rights
- Animal spirits
- Animals in Buddhism
- Animistic fallacy
- Anioł Dowgird
- Anja Steinbauer
- Anna-Teresa Tymieniecka
- Anna Maria van Schurman
- Anne Conway, Viscountess Conway
- Anne Finch
- Anne Louise Germaine de Staël
- Annemarie Gethmann-Siefert
- Annemarie Mol
- Annette Baier
- Anniceris
- Anomalous monism
- Anomie
- Ansatz
- Anselm Jappe
- Anselm of Canterbury
- Anselm of Laon
- Anselme Bellegarrigue
- Ansgar Beckermann
- Answer to Job
- Answering the Question: What Is Enlightenment?
- Antahkarana
- Antanas Maceina
- Antecedent (logic)
- Antenor Orrego
- Anteo Zamboni
- Antepredicament
- Anthem (novella)
- Anthony Ashley-Cooper, 3rd Earl of Shaftesbury
- Anthony Collins
- Anthony Gottlieb
- Anthony John Patrick Kenny
- Anthony Kenny
- Anthony O'Hear
- Anthony of the Mother of God
- Anthony Quinton
- Anthony Quinton, Baron Quinton
- Anthony Rayson
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- Anthropic principle
- Anthropocentrism
- Anthropopath
- Anthropopathy
- Anthroposophy
- Anti-art
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- Anti-Dühring
- Anti-environmentalism
- Anti-foundationalism
- Anti-Germans (communist current)
- Anti-modernization
- Anti-Œdipus
- Anti-psychiatry
- Anti-psychologism
- Anti-racist mathematics
- Anti-realism
- Anti-Revisionism
- Anti-Semite and Jew
- Anti-Semitism
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- Anti-statism
- Anti-Supernaturalism
- Anti-systemic library
- Anti-voting
- Anti-work
- Anticonformism
- Antigone (Sophocles)
- Antihumanism
- Antimilitarism
- Antinatalism
- Antinomianism
- Antinomies
- Antinomy
- Antiochus Kantemir
- Antiochus of Ascalon
- Antipater
- Antipater of Cyrene
- Antipater of Tarsus
- Antipater of Tyre
- Antiperistasis
- Antiphon
- Antiphon (person)
- Antireductionism
- Antireligion
- Antiscience
- Antisthenes
- Antitheism
- Antithesis
- Antoine-Augustin Cournot
- Antoine Arnauld
- Antoine Augustin Cournot
- Antoine Destutt de Tracy
- Antoine Lavoisier
- Antoine Le Grand
- Anton Ambschel
- Anton Günther
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- Anton LaVey
- Anton Wilhelm Amo
- Antonin Sertillanges
- Antoninus (philosopher)
- Antonio Beccadelli
- Antonio Caso Andrade
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- Antonio Cua
- António Damásio
- Antonio Genovesi
- Antonio Gramsci
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- Antonio Téllez
- Antony Flew
- Antwerp school
- Anuario Filosófico
- Aous Shakra
- Apagoge
- Aparoksanubhuti
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- Apatheia
- Apatheism
- Apeiron (cosmology)
- Aphorism
- Apocalypticism
- Apocatastasis
- Apodictic
- Apodicticity
- Apodosis
- Apollodorus of Seleucia
- Apollodorus the Epicurean
- Apollonian and Dionysian
- Apollonius Cronus
- Apollonius of Tyana
- Apollonius of Tyre (philosopher)
- Apologetics
- Apologism
- Apology (Plato)
- Apology (Xenophon)
- Apology of Aristides
- Aponia
- Apophasis
- Apophatic theology
- Apophenia
- Aporetic
- Aporia
- Aporime
- Aposteriori
- Appeal to advantage
- Appeal to authority
- Appeal to belief
- Appeal to consequences
- Appeal to emotion
- Appeal to fear
- Appeal to flattery
- Appeal to motive
- Appeal to nature
- Appeal to novelty
- Appeal to pity
- Appeal to probability
- Appeal to ridicule
- Appeal to spite
- Appeal to tradition
- Appellation
- Apperception
- Appiano Buonafede
- Applicative Universal Grammar
- Applied aesthetics
- Applied art
- Applied ethics
- Applied ontology
- Applied philosophy
- Apportionment paradox
- Approximation
- Aptitude
- Apuleius
- Arab transmission of the Classics to the West
- Arabic philosophy
- Arabic Sciences and Philosophy
- Aramesh Doustdar
- Arbeter Fraynd
- Arbitrariness
- Arbitration
- Arborescent
- Arcadia (play)
- Arcesilaus
- Archaeological ethics
- Arche
- Archē
- Archedemus of Tarsus
- Archeio-Marxism
- Archelaus (philosopher)
- Archetype
- Archibald Alison (author)
- Archibald Campbell (philosopher)
- Archie J. Bahm
- Archimedes
- Architectonic
- Archive Fever
- Archytas
- Arda Denkel
- Areopagitica
- Aretaic
- Aretaic turn
- Arete (moral virtue)
- Arete of Cyrene
- Aretology
- Argentine Libertarian Federation
- Argentine Regional Workers' Federation
- Argument
- Argument form
- Argument from authority
- Argument from beauty
- Argument from consciousness
- Argument from degree
- Argument from design
- Argument from desire
- Argument from evil
- Argument from fallacy
- Argument from free will
- Argument from ignorance
- Argument from illusion
- Argument from inconsistent revelations
- Argument from love
- Argument from marginal cases
- Argument from miracles
- Argument from morality
- Argument from nonbelief
- Argument from poor design
- Argument from queerness
- Argument from Reason
- Argument from religious experience
- Argument from silence
- Argument in the alternative
- Argument map
- Argument to moderation
- Argumentation theory
- Arguments for eternity
- Arguments for the existence of God
- Argumentum ad baculum
- Argumentum ad crumenam
- Argumentum ad hominem
- Argumentum ad ignorantium
- Argumentum ad lapidem
- Argumentum ad lazarum
- Argumentum ad misericordiam
- Argumentum ad numerum
- Argumentum ad populum
- Argumentum ad verecundiam
- Arhat
- Ariadne's thread (logic)
- Arianism
- Ariel Salleh
- Arignote
- Arimneste
- Arindam Chakrabarti
- Aristides of Athens
- Aristion
- Aristippus
- Aristippus the Younger
- Aristo of Alexandria
- Aristo of Ceos
- Aristo of Chios
- Aristobulus of Paneas
- Aristoclea
- Aristocles of Messene
- Aristocracy
- Aristocreon
- Aristonymus
- Aristotelian ethics
- Aristotelian logic
- Aristotelian physics
- Aristotelian rhetoric
- Aristotelian Society
- Aristotelian Society for the Systematic Study of Philosophy
- Aristotelian theory of gravity
- Aristotelian view of a god
- Aristotelian view of God
- Aristotelianism
- Aristotle
- Aristotle's Masterpiece
- Aristotle's theory of universals
- Aristotle's views on women
- Aristotle's wheel paradox
- Aristotle for Everybody
- Aristoxenus
- Arithmetic
- Arithmetic hierarchy
- Arithmetization of analysis
- Arity
- Arius
- Arius Didymus
- Arkhē
- Armand Robin
- Armchair revolutionary
- Armin Mohler
- Arminianism
- Arne Johan Vetlesen
- Arne Naess
- Arne Næss
- Arno Ros
- Arnold Davidson
- Arnold Gehlen
- Arnold Geulincx
- Arnold Ruge
- Arnold J. Toynbee
- Arnouphis
- Aron Gurwitsch
- Arrian
- Arrow's impossibility theorem
- Arrow's paradox
- Arrow's theorem
- Arrow of time
- Arrow paradox
- Ars inveniendi
- Ars Poetica (Horace)
- Art
- Art and morality
- Art as Experience
- Art criticism
- Art Deco in Durban
- Art for art's sake
- Art forgery
- Art manifesto
- Art movement
- Art periods
- Arte Povera
- Artforum
- Arthur Balfour
- Arthur C. Danto
- Arthur Coleman Danto
- Arthur Collier
- Arthur Danto
- Arthur de Gobineau
- Arthur Drews
- Arthur F. Holmes
- Arthur Fine
- Arthur Koestler
- Arthur Lehning
- Arthur Linton Corbin
- Arthur Lipsett
- Arthur M. Young
- Arthur Moeller van den Bruck
- Arthur Norman Prior
- Arthur Oncken Lovejoy
- Arthur Pap
- Arthur Prior
- Arthur Schafer
- Arthur Schopenhauer
- Arthur Schopenhauer's aesthetics
- Arthur Stanley Eddington
- Arthur Willink
- Artificial brain
- Artificial consciousness
- Artificial intelligence
- Artificial language
- Artificial life
- Artist
- Artistic expression
- Artistic freedom
- Artistic inspiration
- Artistic interpretation
- Artistic merit
- Artistic revolution
- Artistic style
- Arto Haapala
- Arts and Crafts Movement
- Arts criticism
- Arturo Andrés Roig
- Artworld
- Arvi Grotenfelt
- Arya
- Arya Samaj
- Aryadeva
- As a Man Thinketh
- As I Lay Dying (novel)
- As I was going to St Ives
- As if
- As She Climbed Across the Table
- Asa Gray
- Asa Kasher
- Asanga
- Asceticism
- Asclepiades of Phlius
- Asclepiades the Cynic
- Asclepigenia
- Asclepiodotus (philosopher)
- Asclepiodotus of Alexandria
- Asclepius of Tralles
- Ascribed status
- Ascriptivism
- Aseity
- Ashanti Alston
- Ashcan School
- Asher Ginzberg
- Ashley Treatment
- Ashtamangala
- Asian values
- Asiatic mode of production
- Askapāda Gotama
- Asociación Continental Americana de Trabajadores
- Aspasius
- Assertion
- Assertoric
- Assi Rahbani
- Assisted suicide
- Association fallacy
- Association for Logic, Language and Information
- Association for Symbolic Logic
- Association for the Scientific Study of Consciousness
- Association of Autonomous Astronauts
- Association of ideas
- Associationism
- Associative law
- Āstika and nāstika
- Astrology
- Aśvaghoṣa
- Asymmetrical
- Ataraxia
- Ateneo de la Juventud
- Athanasius of Alexandria
- Atheism
- Atheist's Wager
- Atheist existentialism
- Athenaeus of Seleucia
- Athenian democracy
- Athenodoros Cananites
- Athenodoros Cordylion
- Athenodorus of Soli
- Athens
- Athīr al-Dīn al-Abharī
- Atisha
- Atlantis
- Atlas Shrugged
- Atman (Buddhism)
- Ātman (Buddhism)
- Atman (Hinduism)
- Atomic fact
- Atomic sentence
- Atomism
- Atonement in Christianity
- Atonement in Judaism
- Atopy (philosophy)
- Atrocity story
- Attacking Faulty Reasoning
- Attalus (Stoic)
- Attempt at a Critique of All Revelation
- Attentional bias
- Atticus (philosopher)
- Attitude (psychology)
- Attitude polarization
- Attorney–client privilege
- Attorney misconduct
- Attorney/client privilege
- Attribute grammar
- Attribution theory
- Attributional bias
- Auberon Herbert
- Auctoritas
- Auctoritates Aristotelis
- Aufheben
- Augmented Backus–Naur form
- Augoeides
- August Cieszkowski
- August Wilhelm Schlegel
- Auguste Comte
- Auguste Vaillant
- Augustin Bonnetty
- Augustin Souchy
- Augustine Eriugena
- Augustine of Hippo
- Augustinian Studies
- Augustinian values
- Augusto César Sandino
- Augusto Vera
- Augustus De Morgan
- Aulus Egnatius Priscillianus
- Aulus Gellius
- Aurel Kolnai
- Austin Farrer
- Austin Marsden Farrer
- Austin Woodbury
- Australasian Association of Philosophy
- Australasian Journal of Philosophy
- Australian materialism
- Australian realism
- Austrofascism
- Autarchism
- Authenticity (philosophy)
- Authoritarianism
- Authority
- Auto-destructive art
- Autocracy
- Autoepistemic logic
- Autological
- Automata theory
- Automated reasoning
- Automatic sequence
- Automaton
- Autonomedia
- Autonomism
- Autonomous Action
- Autonomy
- Autopoiesis
- Avadhuta Gita
- Availability heuristic
- Avant-garde
- Avant-Garde and Kitsch
- Avatar
- Avecebrol
- Avempace
- Average and total utilitarianism
- Averaging argument
- Averroes
- Averroës
- Averroism
- Aversion therapy
- Avicebrol
- Avicebron
- Avicenna
- Avicenna Prize
- Avicennism
- Avidya (Hinduism)
- Avidyā (Buddhism)
- Avishai Margalit
- Avital Ronell
- Avodah
- Avraham son of Rambam
- Avrum Stroll
- Awareness
- Awareness League
- Axel Hägerström
- Axel Honneth
- Axial Age
- Axiochus (dialogue)
- Axiology
- Axiom
- Axiom of abstraction
- Axiom of choice
- Axiom of comprehension
- Axiom of Equity
- Axiom of extensionality
- Axiom of infinity
- Axiom of projective determinacy
- Axiom of reducibility
- Axiom of replacement
- Axiom of separation
- Axiom S5
- Axiom schema
- Axiomatic method
- Axiomatic set theory
- Axiomatic system
- Axiomatization
- Axiothea of Phlius
- Ayatana
- Ayn al-Quzat Hamadani
- Ayn Rand
- Ayn Rand: A Sense of Life
- Ayn Rand: The Russian Radical
- Ayurveda
- Ayyavazhi
- Ayyavazhi phenomenology
- Azizah Y. al-Hibri
- Aztec philosophy
B
- B-series
- B-Theory of time
- B. F. Skinner
- B. R. Ambedkar
- B. Traven
- Babette Babich
- Baby K
- Backgammon
- Backus–Naur form
- Backward causation
- Backward chaining
- Bad faith
- Bad faith (existentialism)
- Baden School
- Bahmanyār
- Bahshamiyya
- Bahya ibn Paquda
- Baker Brownell
- Balance (metaphysics)
- Balance of nature
- Balangoda Ananda Maitreya
- Baltasar Gracián
- Balthasar Bekker
- Banality of evil
- Banausos
- Bandwagon effect
- Bantu Philosophy
- Baptista Mantuanus
- Baptists in the history of separation of church and state
- Barba non facit philosophum
- Barbara
- Barbara Forrest
- Barbara Herrnstein Smith
- Barber paradox
- Barbershop paradox
- Barbizon school
- Barcan formula
- Barcelona May Days
- Bardo
- Bare particular
- Bargaining theory
- Barhaspatya sutras
- Barlaam of Seminara
- Baron d'Holbach
- Baron de Montesquieu
- Baron Herbert of Cherbury
- Baroque
- Baroque Revival architecture
- Barracks communism
- Barrie Karp
- Barrows Dunham
- Barry Loewer
- Barry Smith (ontologist)
- Barry Stroud
- Bartholomäus Keckermann
- Bartholomew Des Bosses
- Bartholomew Keckermann
- Bartholomew of Bologna (philosopher)
- Bartolomé de Medina
- Bartolommeo Spina
- Bartolus de Saxoferrato
- Baruch Spinoza
- Barwise prize
- Barzillai Quaife
- Bas C. van Fraassen
- Bas Haring
- Bas van Fraassen
- Base and superstructure
- Base and superstructure (Marxism)
- Base rate fallacy
- Basic belief
- Basic Limiting Principle
- Basic norm
- Basic Points Unifying the Theravāda and the Mahāyāna
- Basil Mitchell (academic)
- Basilides
- Basilides (Stoic)
- Basilides the Epicurean
- Basilios Bessarion
- Batis of Lampsacus
- Batman: Anarky
- Battle of Peregonovka (1919)
- Bauhaus
- Bay Area Figurative Movement
- Bayes' theorem
- Bayes's rule
- Bayes's theorem
- Bayesian probability
- Bayesianism
- Beatific vision
- Béatrice Longuenesse
- Beatriz Sarlo
- Beauty
- Becoming
- Becoming (philosophy)
- Bedeutung
- Beelzebub's Tales to His Grandson
- Beerwolf
- Begging the question
- Begriffsschrift
- Behavior therapy
- Behavioral script
- Behavioralism
- Behaviorism
- Behaviourism
- Behind the Mirror: A Search for a Natural History of Human Knowledge
- Behold a Pale Horse (film)
- Being
- Being and becoming
- Being and Nothingness
- Being and Time
- Being for itself
- Being in itself
- Béla Balázs
- Béla Hamvas
- Belief
- Belief-Desire-Intention model
- Belief-in
- Belief bias
- Belief in
- Belief revision
- Bell's inequality
- Bell's theorem
- Bellum omnium contra omnes
- Belmont Report
- Ben Salem Himmich
- Benedetto Croce
- Benedict de Spinoza
- Benedict Pereira
- Benedictus Spinoza
- Benedito Nunes
- Beneficence
- Benjamin Apthorp Gould Fuller
- Benjamin Constant
- Benjamin Franklin
- Benjamin Lee (academic)
- Benjamin Paul Blood
- Benjamin Peirce
- Benjamin Tucker
- Benjamin Whichcote
- Benny Lévy
- Benoît Broutchoux
- Benoît de Maillet
- Benson Mates
- Berlin Circle
- Bernard-Henri Lévy
- Bernard A. O. Williams
- Bernard Arthur Owen Williams
- Bernard Bolzano
- Bernard Bosanquet (philosopher)
- Bernard d'Espagnat
- Bernard de Fontenelle
- Bernard Delfgaauw
- Bernard Gert
- Bernard le Bovier de Fontenelle
- Bernard Le Bovier de Fontenelle
- Bernard Lonergan
- Bernard Mandeville
- Bernard Mayo
- Bernard Narokobi
- Bernard Nieuwentyt
- Bernard of Chartres
- Bernard of Clairvaux
- Bernard of Trilia
- Bernard Philip Kelly
- Bernard Rollin
- Bernard Silvestris
- Bernard Stiegler
- Bernard Williams
- Bernard Yack
- Bernardino Telesio
- Bernardino Varisco
- Bernhard Riemann
- Bernoulli's principle
- Bernoulli's theorem
- Berry's paradox
- Bert Mosselmans
- Berthold of Moosburg
- Berthold Wulf
- Bertil Mårtensson
- Bertrand paradox (economics)
- Bertrand paradox (probability)
- Bertrand's box paradox
- Bertrand Arthur William Russell
- Bertrand de Jouvenel
- Bertrand Russell
- Bertrand Russell's views on philosophy
- Bertrand Russell's views on society
- Best of all possible worlds
- Bête machine
- Betrayal
- Between Facts and Norms
- Between Heaven and Hell (novel)
- Between Past and Future
- Beuron Art School
- Beyond Belief: Science, Religion, Reason and Survival
- Beyond Freedom and Dignity
- Beyond Good and Evil
- Beyond the Pleasure Principle
- Bhagavad Gita
- Bhakti
- Bhartrhari
- Bhava
- Bhavanga
- Bhāvaviveka
- Bhedabheda
- Bhikhu Parekh, Baron Parekh
- Bhumi (Buddhism)
- Bias
- Bias blind spot
- Bible
- Biblical literalism
- Bibliography for Ayn Rand and Objectivism
- Biconditional
- Biconditional elimination
- Biconditional introduction
- Biennio rosso
- Big Book (thought experiment)
- Bigram
- Bill Martin (philosophy)
- Bilocation
- Binary opposition
- Biocentric universe
- Biocentrism (ethics)
- Biodefense
- Bioethics
- Bioethics (journal)
- Biofact (philosophy)
- Biofacticity
- Biographia Literaria
- Biographical fallacy
- Biological determinism
- Biological naturalism
- Biological warfare
- Biomedical tissue
- Bion of Borysthenes
- Biopolitics
- Biopower
- Biosafety
- Biosecurity
- Biosophy
- Biotic Baking Brigade
- Bisexuality
- Bite the bullet
- Bivalence
- Bjarni Jónsson
- Bl(A)ck Tea Society
- Black-Body Theory and the Quantum Discontinuity
- Black anarchism
- Black Artists Group
- Black Arts Movement
- Black bloc
- Black box
- Black box theory
- Black existentialism
- Black Flag (newspaper)
- Black Laundry
- Black Mask (anarchists)
- Black Panther Party
- Black Sotnia
- Black Star (anarchist group)
- Black swan theory
- Blackbird Raum
- Blackwell Companion to Philosophy
- Blaise Pascal
- Blame
- Blanquism
- Bleen
- Blindsight
- Blockhead (thought experiment)
- Blossius
- Bluestocking (journal)
- Bluestockings (bookstore)
- Blyenbergh
- Boasting
- Boatmen of Thessaloníki
- Bob Black
- Bob Hale (philosopher)
- Bodhi
- Bodhimandala
- Bodhisattva Precepts
- Bodhisena
- Body donation
- Body of Knowledge
- Body politic
- Body without organs
- Bodymind
- Boethius
- Boethus of Sidon (Peripatetic)
- Boethus of Sidon (Stoic)
- Boetius of Dacia
- Bohm interpretation
- Bohr–Einstein debates
- Bolam v Friern Hospital Management Committee
- Bolshevik
- Bolus of Mendes
- Bonapartism (Marxism)
- Bonaventure
- Boncompagno da Signa
- Bonifaty Kedrov
- Bonini's paradox
- Bonnie Honig
- Bonnie Steinbock
- Bonnot Gang
- Book of Causes
- Book of Changes
- Book of Life
- Boolean algebra (logic)
- Boolean grammar
- Bootstrapping
- Borden Parker Bowne
- Boredom
- Boris Chicherin
- Boris Furlan
- Boris Grushin
- Boris Hessen
- Borussian myth
- Bound variable
- Bourgeois
- Bourgeois socialism
- Bourgeoisie
- Bowling Green Studies in Applied Philosophy
- Boyd Henry Bode
- Boyle Lectures
- Bracha L. Ettinger
- Bracketing (phenomenology)
- Bracketing paradox
- Brad Hooker
- Brahma
- Brahmacharya
- Brahman
- Brahmavihara
- Brahmin
- Brahmo Samaj
- Brain
- Brain-in-a-vat theory
- Brain event
- Brain in a vat
- Brainstorm machine
- Brainstorms
- Brand Blanshard
- Brandon Darby
- Branko Bošnjak
- Brazilian Workers Confederation
- Breaking the Spell (film)
- Breaking the Spell: Religion as a Natural Phenomenon
- Brethren of Purity
- Brian Barry
- Brian Boyd
- Brian David Ellis
- Brian Davies (philosopher)
- Brian Klug
- Brian Leftow
- Brian Leiter
- Brian MacKenzie Infoshop
- Brian Massumi
- Brian O'Shaughnessy (philosopher)
- Brian Orend
- Brian Skyrms
- Brian Weatherson
- Bridge ethics
- Brie Gertler
- Brights movement
- British Empiricists
- British Humanist Association
- British idealism
- British Idealism
- British Journal of Aesthetics
- British Philosophical Association
- British philosophy
- Broadway Barks
- Bronisław Trentowski
- Bronius Kuzmickas
- Brontinus
- Brother Wolf
- Brownie points
- Bruce Lee
- Bruce Weinstein
- Bruce Wilshire
- Brunetto Latini
- Bruno Bauch
- Bruno Bauer
- Bruno de Finetti
- Bruno Leoni
- Brute fact
- Bryan Caplan
- Bryan Magee
- Bryson of Achaea
- Bryson of Heraclea
- Buchmanism
- Budaya
- Buddha-nature
- Buddhaghosa
- Buddhahood
- Buddhapālita
- Buddhism
- Buddhism and evolution
- Buddhist anarchism
- Buddhist ethics
- Buddhist philosophy
- Buddhist schools
- Buddhist view of marriage
- Buenaventura Durruti
- Bullshit
- Bulverism
- Bunched logic
- Bundle theory
- Bundle theory of the self
- Burali-Forte paradox
- Burali-Forti's paradox
- Burchard de Volder
- Burden of proof (logical fallacy)
- Bureaucracy
- Bureaucratic collectivism
- Burghart Schmidt
- Buridan's ass
- Burleigh Taylor Wilkins
- Burrhus Frederic Skinner
- Burton Dreben
- Business ethics
- Buttered cat paradox
- By any means necessary
- Byzantine philosophy
- Byzantine rhetoric
- Byzantinism
C
- C. Anthony Anderson
- C. D. Broad
- C. E. M. Joad
- C. I. Lewis
- C. Lloyd Morgan
- C. S. Lewis
- C. S. Lewis bibliography
- C. Stephen Evans
- C. T. K. Chari
- C. A. J. Coady
- Cabbala
- Café Philosophique
- Cahal Daly
- Cai Yuanpei
- Caigentan
- Cairo Declaration on Human Rights in Islam
- Cajetan
- Calcidius
- Calculus
- Calculus of structures
- Calculus ratiocinator
- Calippus of Syracuse
- Callicles
- Calliphon
- Calliphon of Croton
- Callippus
- Callistratus (sophist)
- Calvin Normore
- Calvin Seerveld
- Calvinism
- Camas Bookstore and Infoshop
- Cambridge change
- Cambridge Philosophical Society
- Cambridge Platonism
- Cambridge Platonists
- Camera del Lavoro
- Camera obscura
- Camilo Cienfuegos
- Camp (style)
- Canadian Journal of Philosophy
- Canadian Society for History and Philosophy of Mathematics
- Candace Vogler
- Candide
- Candrakīrti
- Canonical form (Boolean algebra)
- Cantor's paradox
- Cantor's theorem
- Capacity
- Capital accumulation
- Capital punishment
- Capital, Volume I
- Capitalism
- Capitalism: The Unknown Ideal
- Capitalist mode of production
- Capitalist realism
- Cappadocian Fathers
- Carceral state
- Cardinal Mercier Prize for International Philosophy
- Cardinal utility
- Cardinal virtues
- Cardinality
- Care
- Care Not Killing
- Carew Arthur Meredith
- Cargo cult science
- Carl Cohen
- Carl Dahlhaus
- Carl Elliott (philosopher)
- Carl Friedrich Gauss
- Carl Friedrich von Weizsäcker
- Carl G. Hempel
- Carl Ginet
- Carl Gustav Carus
- Carl Gustav Hempel
- Carl Gustav Jung
- Carl Hempel
- Carl Joachim Friedrich
- Carl Jung
- Carl Linnaeus
- Carl Mitcham
- Carl Schmitt
- Carl Stumpf
- Carl von Linnaeus
- Carlo Cattaneo
- Carlo Lottieri
- Carlo Michelstaedter
- Carlo Penco
- Carlo Rosselli
- Carlo Tresca
- Carlos Bernardo González Pecotche
- Carlos Brandt
- Carlos Castrodeza
- Carlos Castaneda
- Carlos Cirne Lima
- Carlos Santiago Nino
- Carlos Vaz Ferreira
- Carmen Laforet
- Ramsey sentence
- Carneades
- Carneiscus
- Carol Gilligan
- Caroline Joan S. Picart
- Carolingian Renaissance
- Carolus Sigonius
- Carolyn Merchant
- Carsun Chang
- Cartesian anxiety
- Cartesian circle
- Cartesian demon
- Cartesian doubt
- Cartesian dualism
- Cartesian materialism
- Cartesian Meditations
- Cartesian Other
- Cartesian product
- Cartesian Self
- Cartesian skepticism
- Cartesian theater
- Cartesianism
- Cārvāka
- Carveth Read
- Case-based reasoning
- Casimir Lewy
- Caspar Isenkrahe
- Cassius Longinus (philosopher)
- Casuistry
- Cat's Cradle
- Catch-22 (logic)
- Catechism of a Revolutionary
- Categoriae decem
- Categorical
- Categorical imperative
- Categorical logic
- Categorical proposition
- Categorical theory
- Categoricity
- Categories (Aristotle)
- Categories (Peirce)
- Categories of the understanding
- Categorization
- Category (Kant)
- Category (philosophy)
- Category mistake
- Category of being
- Category theory
- Catharine Macaulay
- Catharsis
- Catherine Clément
- Catherine Elgin
- Catherine Malabou
- Catherine of Siena
- Catherine Perret
- Catherine Trotter
- Catherine Trotter Cockburn
- Catholic guilt
- Catholic Probabilism
- Catius
- Cato Maior de Senectute
- Cato the Elder
- Cato the Younger
- Catonism
- Causa sui
- Causal-historical theory of reference
- Causal adequacy principle
- Causal chain
- Causal closure
- Causal decision theory
- Causal determinism
- Causal diagram
- Causal Markov condition
- Causal relation
- Causal theory of proper names
- Causal theory of reference
- Causalism
- Causality
- Causality loop
- Causation (law)
- Causative verb
- Cause
- Cavalcante de' Cavalcanti
- Cebes
- Celestial spheres
- Célestin Bouglé
- Celia Green
- Celine's laws
- Cellular automaton
- Celsus
- Cemal Yildirim
- Center Leo Apostel for Interdisciplinary Studies
- Centre de recherche et de documentation sur Hegel
- Centre for Applied Ethics
- Centre for Applied Philosophy and Public Ethics (CAPPE)
- Centre for History and Philosophy of Science, University of Leeds
- Cercidas
- Cercops
- Certainty
- César Chesneau Dumarsais
- César Dávila Andrade
- Cesare Beccaria
- Cesare Cremonini (philosopher)
- Ceteris paribus
- CH
- Ch'i
- Ch'ien Mu
- Chaeremon of Alexandria
- Chaerephon
- Chaeron of Pellene
- Chaïm Perelman
- Chain of events
- Chaldean Oracles
- Chamaeleon (philosopher)
- Chanakya
- Chance (Ancient Greek concept)
- Chandragomin
- Change
- Chantal Maillard
- Chao Cuo
- Chaos
- Chaos theory
- Chaotic system
- Character Strengths and Virtues (book)
- Character structure
- Character traits
- Characteristica universalis
- Chariot Allegory
- Charismatic authority
- Charity (practice)
- Charity (virtue)
- Charity International
- Charles A. Moore
- Charles Babbage
- Charles Batteux
- Charles Bernard Renouvier
- Charles Blount (deist)
- Charles Bonnet
- Charles Butterworth (philosopher)
- Charles Carroll Everett
- Charles Darwin
- Charles de Secondat, baron de Montesquieu
- Charles Fourier
- Charles François d'Abra de Raconis
- Charles Frankel
- Charles Fremont Dight
- Charles Graves (bishop)
- Charles Hartshorne
- Charles Kay Ogden
- Charles L. Stevenson
- Charles Leonard Hamblin
- Charles Leslie Stevenson
- Charles Louis de Secondat, Baron de Montesquieu
- Charles Lutwidge Dodgson
- Charles Malato
- Charles Maurras
- Charles Morris, Baron Morris of Grasmere
- Charles Parsons (philosopher)
- Charles Renouvier
- Charles Robert Darwin
- Charles Sanders Peirce
- Charles Sanders Peirce bibliography
- Charles Secrétan
- Charles Stevenson
- Charles Taylor (philosopher)
- Charles W. Morris
- Charles Waddington (philosopher)
- Charles Winquist
- Charlotte Perkins Gilman
- Charlotte Wilson
- Charmadas
- Charmides (dialogue)
- Charter for Compassion
- Chastity
- Chatral Rinpoche
- Chauncey Wright
- Chaz Bufe
- Chemism
- Chen Chung-hwan
- Chen Daqi
- Chen Duxiu
- Chen Hongmou
- Cheng Hao
- Cheng Yi (philosopher)
- Chernoe Znamia
- Cherry picking (fallacy)
- Cheung Kam Ching
- Chia I
- Chia Yi
- Chicago school (mathematical analysis)
- Chicken or the egg
- Chih
- Chih-I
- Chih Tun
- Child labour
- China brain
- Chinese Classics
- Chinese Legalism
- Chinese philosophy
- Chinese room
- Chinese world
- Chinoiserie
- Chinul
- Chion of Heraclea
- Chivalry
- Chöd
- Choe Chung
- Chögyam Trungpa
- Choice
- Choice-supportive bias
- Choice sequence
- Chomsky hierarchy
- Chomsky normal form
- Choosing
- Chora
- Choricius of Gaza
- Chovot ha-Levavot
- Chrematistics
- Chris Bobonich
- Chris Crass
- Chris Huebner
- Christiaan Cornelissen
- Christiaan Huygens
- Christian anarchism
- Christian August Crusius
- Christian de Quincey
- Christian Discourses
- Christian ethics
- Christian existentialism
- Christian Friedrich Hebbel
- Christian Garve
- Christian Hermann Weisse
- Christian humanism
- Christian Kabbalah
- Christian materialism
- Christian philosophy
- Christian Realism
- Christian Thomasius
- Christian von Ehrenfels
- Christian Wolff (philosopher)
- Christianity and environmentalism
- Christine Buci-Glucksmann
- Christine de Pizan
- Christine Korsgaard
- Christine Ladd-Franklin
- Christofascism
- Christological argument
- Christology
- Christoph Gottfried Bardili
- Christoph Meiners
- Christoph Schrempf
- Christoph von Sigwart
- Christopher Cherniak
- Christopher D. Green
- Christopher Fynsk
- Christopher Jacob Boström
- Christopher Janaway
- Christopher Norris (critic)
- Christopher Peacocke
- Christopher Potter (author)
- Christopher R. Phillips
- Christos Yannaras
- Chronocentrism
- Chronological snobbery
- Chronology protection conjecture
- Chrysanthius
- Chrysippus
- Chrysorrhoas
- Chu Anping
- Chu Hsi
- Chuck Munson
- Chumbawamba
- Chün-tzu
- Chung-ying Cheng
- Chung-yung
- Chung Yung
- Chunyu Kun
- Church's theorem
- Church's thesis
- Church–Turing thesis
- Church–Turing–Deutsch principle
- Church fathers
- Cicero
- Cienfuegos press
- Cincinnati Time Store
- Cindy Milstein
- Cinema 1: The Movement Image
- Cipriano Mera
- Circle of Tchaikovsky
- Circular cause and consequence
- Circular definition
- Circular reasoning
- Circumcision controversies
- Citationality
- Citizen Cyborg
- Citizenship
- City of God (book)
- Civic humanism
- Civic virtue
- Civics
- Civil discourse
- Civil disobedience
- Civil liberties
- Civil rights
- Civil society
- Civil union
- Civilization and Its Discontents
- Claim right
- Clairvoyance
- Clare W. Graves
- Clarembald of Arras
- Clarence Irving Lewis
- Clarity of scripture
- Clarity test
- Class (philosophy)
- Class collaboration
- Class consciousness
- Class struggle
- Classical conditioning
- Classical liberalism
- Classical logic
- Classical mechanics
- Classical Realism
- Classical republicanism
- Classical theism
- Classicism
- Classics
- Classification of the sciences (Peirce)
- Classificatory disputes about art
- Classless society
- Claude-Arien Helvetius
- Claude Adrien Helvétius
- Claude Buffier
- Claude Henri de Rouvroy, comte de Saint-Simon
- Claude Lefort
- Claude Lévi-Strauss
- Claude Lévi-Strauss
- Claude Tresmontant
- Claudio Canaparo
- Claudio Ulpiano
- Claudius Maximus
- Claus Emmeche
- Clause (logic)
- Cleanliness
- Cleanthes
- Clearchus of Soli
- Cleinias of Tarentum
- Clémence Royer
- Clemens Baeumker
- Clemens Timpler
- Clement Greenberg
- Clement of Alexandria
- Clément Rosset
- Cleobulus
- Cleomedes
- Cleomenes the Cynic
- Clerical fascism
- Clerical philosophers
- Clericalism
- Clifford Harper
- Clifford Williams (academic)
- Climate ethics
- Clinamen
- Clinical death
- Clinical equipoise
- Clinomachus
- Clitomachus (philosopher)
- Clitophon (dialogue)
- Clive Bell
- Clive Staples Lewis
- CLODO
- Cloning
- Close reading
- Closed circle
- Closed concept
- Closed formula
- Closed loop
- Closed sentence
- Closed world assumption
- Cloudesley
- Clustering illusion
- Co-premise
- Coase theorem
- Code (law)
- Coercion
- Cogency
- Cogito (magazine)
- Cogito ergo sum
- Cognition
- Cognitive architecture
- Cognitive bias
- Cognitive closure (philosophy)
- Cognitive description
- Cognitive development
- Cognitive dissonance
- Cognitive liberty
- Cognitive map
- Cognitive meaning
- Cognitive module
- Cognitive neuroscience
- Cognitive ontology
- Cognitive psychology
- Cognitive relativism
- Cognitive revolution
- Cognitive science
- Cognitive science of mathematics
- Cognitive synonymy
- Cognitivism (ethics)
- Coherence (philosophical gambling strategy)
- Coherence theory of truth
- Coherentism
- Coimbra commentaries
- Coimbra group
- Cointerpretability
- Colin Howson
- Colin McGinn
- Colin Murray Turbayne
- Colin Wilson
- Collapse (journal)
- Collapse theories (quantum mechanics)
- Collective belief
- Collective memory
- Collective responsibility
- Collective unconscious
- Collectivism and individualism
- Collectivist anarchism
- Collectivity
- Collège international de philosophie
- Collegium Conimbricense
- Colloque Walter Lippmann
- Colloquial language
- Color
- Color Field
- Color realism (philosophy)
- Colotes
- Combinational logic
- Combinatory logic
- Comedy
- Comenius
- Comité Consultatif National d'Ethique
- Commensurability (ethics)
- Commensurability (philosophy of science)
- Commentaria in Aristotelem Graeca
- Commentaries on Aristotle
- Commentaries on Plato
- Commission of Anarchist Relations
- Committee for the Scientific Examination of Religion
- Commodification
- Commodity (Marxism)
- Commodity fetishism
- Commodity form theory
- Common good
- Common Ground Collective
- Common knowledge
- Common knowledge (logic)
- Common law
- Common ownership
- Common rule
- Common sense
- Common sense and the Diallelus
- Common sense reasoning
- Commonsense reasoning
- Communication
- Communication theory
- Communicative action
- Communicative rationality
- Communism
- Communitarianism
- Community
- Community arts
- Communization
- Compactness
- Compactness theorem
- Comparatio
- Compassion
- Compassionate conservatism
- Compatibilism
- Compatibilism and incompatibilism
- Compensation (essay)
- Compensationism
- Completeness (logic)
- Completeness theorem
- Complexity
- Composition (logical fallacy)
- Composition of Causes
- Compositionality
- Compossibility
- Compossible
- Compound question
- Comprehension (logic)
- Compromise
- Computability
- Computability logic
- Computable
- Computational complexity
- Computational epistemology
- Computational humor
- Computational theories of mind
- Computational theory of mind
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- Computers
- Comtism
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- Concepts
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- Conceptual definition
- Conceptual framework
- Conceptual metaphor
- Conceptual model
- Conceptual necessity
- Conceptual role semantics
- Conceptual scheme
- Conceptual system
- Conceptualism
- Concerned Philosophers for Peace
- Conciliarism
- Conciliation
- Concluding Unscientific Postscript to Philosophical Fragments
- Conclusive evidence
- Concord School of Philosophy
- Concrescence
- Concretion
- Concretism
- Concupiscence
- Condemnations of 1210–1277
- Condensed detachment
- Conditio sine qua non
- Condition of possibility
- Conditional probability
- Conditional proof
- Conditioned disjunction
- Condorcet
- Condorcet winner
- Conduct
- Confederación Nacional del Trabajo
- Confederalism
- Confédération nationale du travail
- Configurations
- Confirmation
- Confirmation bias
- Confirmation holism
- Confirmational holism
- Conflict between good and evil
- Conflict of interest
- Conflict theory
- Conformism
- Confucian Analects
- Confucian philosophy
- Confucian view of marriage
- Confucianism
- Confucianism in Indonesia
- Confucius
- Confusion of the inverse
- Congruence bias
- Conimbricenses
- Conjecture
- Conjectures and Refutations
- Conjunction elimination
- Conjunction fallacy
- Conjunction introduction
- Conjunctive grammar
- Conjunctive normal form
- Connectionism
- Connectives
- Connexive logic
- Connotation
- Conscience
- Conscience clause (medical)
- Conscious automatism
- Conscious mind
- Consciousness
- Consciousness-only
- Consciousness and Cognition
- Consciousness Explained
- Consensual crime
- Consensual living
- Consensus
- Consensus decision-making
- Consensus democracy
- Consensus reality
- Consensus theory of truth
- Consent
- Consent theory
- Consequence relation
- Consequent
- Consequentia mirabilis
- Consequentialism
- Consequentialist justifications of the state
- Consequentialist libertarianism
- Conservation (ethic)
- Conservation biology
- Conservation ethic
- Conservation movement
- Conservatism
- Considerations on Representative Government
- Consilience
- Consistent life ethic
- Consolatio Literary Genre
- Consolation of Philosophy
- Constance Naden
- Constant capital
- Constant sum game
- Constantin Brunner
- Constantin Noica
- Constantin Rădulescu-Motru
- Constantin Schifirneţ
- Constantin Stere
- Constantine of Kostenets
- Constantinos Speras
- Constitution
- Constitution of the Athenians (Aristotle)
- Constitution of the Athenians (Pseudo-Xenophon)
- Constitutional law
- Constitutional right
- Constitutionalism
- Construct (philosophy of science)
- Constructible universe
- Constructive dilemma
- Constructive empiricism
- Constructive realism
- Constructivism (art)
- Constructivism (mathematics)
- Constructivist epistemology
- Constructivist Foundations
- Consubstantiation
- Consumerism
- Consumption of fixed capital
- Container (Type theory)
- Container space
- Containment
- Contemporary anarchism
- Contemporary Islamic philosophy
- Contemporary philosophy
- Contemporary Political Theory
- Contemporary Pragmatism
- Contemporary Whitehead Studies
- Contentment
- Context-free grammar
- Context-free language
- Context-sensitive grammar
- Context-sensitive language
- Context principle
- Contextual empiricism
- Contextualism
- Contiguity
- Continental philosophy
- Contingency
- Contingency (philosophy)
- Contingency, irony, and solidarity
- Contingent
- Continuity (fiction)
- Continuum fallacy
- Continuum hypothesis
- Continuum of Humanist Education
- Contra Celsum
- Contra principia negantem disputari non potest
- Contract theory
- Contractarianism
- Contractualism
- Contradiction
- Contradictions
- Contraposition
- Contraposition (traditional logic)
- Contrapositive
- Contrast effect
- Contrast theory of meaning
- Contrastivism
- Contributions to Philosophy (From Enowning)
- Contributory value
- Control (management)
- Controversy over Cantor's theory
- Convention (norm)
- Convention T
- Conventionalism
- Convergence (series)
- Conversational implicature
- Converse accident
- Converse implication
- Converse nonimplication
- Converse relation
- Conversion (logic)
- Convivio
- Convolution (computer science)
- Cool (aesthetic)
- Cooperation
- Cooperative federalism
- Cooperative principle
- Coordination problem
- Coordinative definition
- Copernican principle
- Copernican Revolution
- Copernican Revolution (metaphor)
- Copula (linguistics)
- Cora Diamond
- Core ontology
- Corelative
- Coriscus of Scepsis
- Corliss Lamont
- Cornel West
- Cornelian dilemma
- Cornelio Fabro
- Cornelis Willem Opzoomer
- Cornelius Castoriadis
- Cornelius de Pauw
- Cornell realism
- Corollary
- Corporate behaviour
- Corporate crime
- Corporate nationalism
- Corporate social responsibility
- Corporate statism
- Corporatism
- Corpus Aristotelicum
- Correlation does not imply causation
- Correlative-based fallacies
- Correspondence theory of truth
- Corresponding conditional (logic)
- Corroboration
- Corruption (philosophical concept)
- Cosimo Boscaglia
- Cosmic consciousness
- Cosmic pluralism
- Cosmicism
- Cosmocentrism
- Cosmogony
- Cosmographia (Bernard Silvestris)
- Cosmological argument
- Cosmology
- Cosmology (metaphysics)
- Cosmopolitanism
- Cosmos
- Cosmotheology
- Cost-benefit analysis
- Costanzo Preve
- Costas Douzinas
- Council communism
- Count Lev Nikolaevich Tolstoi
- Count noun
- Richard von Coudenhove-Kalergi
- Countable
- Counter-Enlightenment
- Counterargument
- Counterexample
- Counterfactual conditional
- Counterfactual conditionals
- Counterfactuals
- Counterinduction
- Counterintuitive
- Counterpart theory
- Counting
- Coup d'État: A Practical Handbook
- Courage
- Course in General Linguistics
- Covering-law model
- Covering law model
- Cowardice
- Cowley Club
- CPNSS
- Craig's theorem
- Craig reduct
- Crantor
- Crass
- Crates of Athens
- Crates of Mallus
- Crates of Thebes
- Cratippus of Pergamon
- Cratylism
- Cratylus
- Cratylus (dialogue)
- Creatio ex materia
- Creatio ex nihilo
- Creation myth
- Creationism
- Creative accounting
- Creative destruction
- Creative Evolution (book)
- Creativity
- Credibility
- Credo quia absurdum
- Credo quia absurdum est
- Credo ut intelligam
- Crescens the Cynic
- Cressida Heyes
- Cries and Whispers
- Crime
- Crime against humanity
- Crime and punishment
- Crime and Punishment
- CrimethInc.
- CrimethInc. Guerilla Film Series, Volume One
- CrimethInc. N©! license
- CrimethInc. publications
- Criminal justice
- Crinis
- Crispin Sartwell
- Crispin Wright
- Cristina Bicchieri
- Cristoforo Landino
- Criteria of truth
- Criterion
- Critias (dialogue)
- Critic
- Critica Sociale
- Critical discourse analysis
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- Critical Language Awareness
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- Critical Mass
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- Critical race theory
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- Critical reading
- Critical realism
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- Critical theory
- Critical thinking
- Critical vocabulary
- Criticism of capitalism
- Criticism of Christianity
- Criticism of Hinduism
- Criticism of Islam
- Criticism of Jesus
- Criticism of Judaism
- Criticism of monotheism
- Criticism of postmodernism
- Criticism of religion
- Criticism of the Bible
- Criticism of the Catholic Church
- Criticism of the Latter Day Saint movement
- Criticism of the Qur'an
- Criticisms of anarchism
- Criticisms of electoralism
- Critique
- Critique (Journal of Socialist Theory)
- Critique of Cynical Reason
- Critique of Dialectical Reason
- Critique of Hegel's Philosophy of Right
- Critique of ideology
- Critique of Judgement
- Critique of Practical Reason
- Critique of Pure Reason
- Critiques of Slavoj Žižek
- Crito
- Critolaus
- Cronaca Sovversiva
- Cronius the Pythagorean
- Crooked Timber
- Crucial experiment
- Cruelty
- Crusties
- Crypto-anarchism
- Crypto-fascism
- Crystallized self
- CTheory
- Cuban Libertarian Movement
- Cubism
- Cultural bias
- Cultural evolution
- Cultural hegemony
- Cultural history
- Cultural identity
- Cultural influence of Plato's Republic
- Cultural materialism (anthropology)
- Cultural materialism (cultural studies)
- Cultural nationalism
- Cultural relativism
- Cultural studies
- Culture
- Culture of life
- Culture of the Song Dynasty
- Cum hoc ergo propter hoc
- Cura te ipsum
- Curie
- Curiosity
- Curious George Brigade
- Curry's paradox
- Curt John Ducasse
- Curve fitting problem
- Cusa
- Cusanus
- Cut-elimination theorem
- Cuteness
- Cyberethics
- Cybernetics
- Cyborg theory
- Cyclic history
- Cynic epistles
- Cynical Realism
- Cynicism (contemporary)
- Cynicism (philosophy)
- Cyphernomicon
- Cyrenaics
- Cyril of Alexandria
- Cyropaedia
- Czech philosophy
- Czesław Lejewski
- Czesław Znamierowski