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- A Christian Reflection on the New AgeA Christian Reflection on the New Age refers to a six-year study by the Roman Catholic Chu
- A Dialogue of Comfort against Tribulation1534 book by Thomas More
- A General Rhetoric1970 book
- A Grief Observed1961 memoir by C.S. Lewis
- A History of Philosophy (Copleston)Book by Frederick Copleston
- A Letter Concerning Toleration1689 book by John Locke
- A priori and a posterioriTwo types of knowledge, justification, or argument
- A System of Moral Philosophy, in Three Books1755 book by Francis Hutcheson
- A Theory of Justice1971 book by John Rawls
- A Thousand Plateaus1980 book by Gilles Deleuze and Félix Guattari
- A Treatise Concerning the Principles of Human Knowledge1710 book by George Berkeley
- A Treatise of Human Nature1739–40 book by David Hume
- A. C. GraylingEnglish philosopher
- AbaturUthra (angelic being) in Mandaeism
- Abraham Mendelssohn BartholdyAbraham Ernst Mendelssohn Bartholdy (born Abraham Mendelssohn; 10 December 1776 – 19 Novem
- Absence of goodTheological and philosophical doctrine
- Absolute (philosophy)Philosophical or theological concept
- AbstinenceSelf-enforced restraint from pleasurable activities
- Abstract and concreteMetaphysics concept covering the divide between two types of entities
- Abstract object theoryBranch of metaphysics regarding abstract objects
- AbstractionProcess of generalization
- AbsurdismTheory that life is meaningless
- AbsurdityExtremely unreasonable, foolish
- Abu Ya'qub al-Sijistani10th century Persian Ismaili missionary and Neo-Platonic philosopher
- Academic skepticismSkeptical period of ancient Academy
- Accident (fallacy)The fallacy of accident (also called destroying the exception or a dicto simpliciter ad di
- Accident (philosophy)Philosophical attribute
- Accounting ethicsAccounting ethics is primarily a field of applied ethics and is part of business ethics an
- Achieving Our Country1998 book by Richard Rorty
- Achille MbembeCameroonian historian and political theorist (born 1957)
- AcosmismPhilosophical belief
- Action (philosophy)Event done by an agent for a purpose
- Action theory (philosophy)Theory of the processes causing willful human bodily movements
- Actus purusAbsolute perfection of God, in Christian theology
- Ad hominemAttacking the person rather than their argument
- Ad nauseamDiscussion that has continued to the point of nausea
- Adam KasiaHidden Adam in Mandaeism
- Adaptive biasTheory of bias in human reasoning
- Adelard of Bath12th-century English natural philosopher
- Adélie penguinSpecies of bird
- Adolf LindenbaumPolish mathematician and logician (1904–1941)
- Aenesidemus1st century BC Greek Pyrrhonist philosopher
- Aesthetic tastePersonal and cultural pattern of choice and preference
- AestheticsPhilosophical study of beauty and art
- Aether (classical element)Classical element
- Affect (philosophy)Philosophy concept by Baruch Spinoza
- Affirming the consequentType of fallacious argument (logical fallacy)
- African philosophyPhilosophical movement
- Africana philosophyArea of study within Africana studies
- AfrobarometerThe Afrobarometer is a pan-African, independent, non-partisan research network that measur
- After Virtue1981 book by Alasdair MacIntyre
- Agnostic atheismPosition combining atheism and agnosticism
- Agnostic theismPhilosophical view combining theism with agnosticism
- AgriculturalismEarly agrarian Chinese philosophy
- Aimé Césaire bibliographyEach year links to its corresponding "[year] in poetry" article for poetry, or "[year] in
- Aitareya UpanishadOne of the ancient Sanskrit scriptures of Hinduism
- Ākāśa (Jainism)Ākāśa is space in the Jain conception of the cosmos. It is one of the six dravyas (substan
- Al-Ma'arriArab philosopher and poet (973–1057)
- Alain BadiouFrench philosopher (born 1937)
- Alan BloomAlan Herbert Vauser Bloom MBE (19 November 1906 – 31 March 2005) was a British horticultur
- Alan SheridanAlan Sheridan (1934 - 2015) was an English author and translator.
- Alasdair MacIntyreScottish-American philosopher (1929–2025)
- Alcuin8th-century English scholar, clergyman, poet, and teacher
- Alenka ZupančičAlenka Zupančič (born 1 April 1966) is a Slovenian philosopher whose work focuses on psych
- Alexander BogdanovRussian physician, philosopher, and revolutionary (1873–1928)
- Alexander Gottlieb BaumgartenGerman philosopher
- Alexander of Aphrodisias2nd-3rd century Greek peripatetic philosopher
- Alexandre KojèveRussian-born French philosopher and statesman (1902–1968)
- Alexius MeinongAustrian philosopher (1853–1920)
- Alfred DelpAlfred Friedrich Delp SJ (German: ; 15 September 1907 – 2 February 1945) was a German Jesu
- Algirdas Julien GreimasLithuanian-French linguist (1917–1992)
- Ali Akbar RashadIranian Ayatollah and philosopher
- Alison JaggarAmerican feminist philosopher (born 1942)
- All About Love: New Visions2000 book by bell hooks
- Allan BloomAmerican philosopher, classicist, and academician (1930–1992)
- Allan GibbardAmerican philosopher and social choice theorist (1942-)
- Allegorical interpretations of PlatoMany interpreters of Plato held that his writings contain passages with double meanings, c
- Allegory of the caveAllegory by Plato
- Alma Rišaia RbaReligious text of Mandaeism
- Alma Rišaia ZuṭaReligious text of Mandaeism
- Alonso RodriguezAlphonsus (Alonso) Rodriguez (1538 in Valladolid, Spain – 21 February 1616 in Seville) was
- AltenbergeAltenberge (Westphalian: Ollenbiärg) is a municipality in the district of Steinfurt, in No
- Alternative technologyAlternative technology is a term used to refer to technologies that are more environmental
- Alternatives to the Ten CommandmentsSeveral alternatives to the Ten Commandments have been promulgated by different persons an
- Altruism (ethics)Ethical belief that actions are morally good only if they benefit others
- Alvin GoldmanAmerican philosopher (1938–2024)
- AmbiguityType of uncertainty of meaning where several interpretations are possible
- American AtheistsAtheism activist organization
- American Enlightenment18th-century colonial and early American intellectual ferment
- American Humanist AssociationUS secularist advocacy organization
- American philosophyCorpus of philosophers of the United States
- AmillennialismBelief that there will be no millennial reign of the righteous on Earth
- AmoralityLack or absence of morality
- An Enquiry Concerning Human Understanding1748 book by David Hume
- An Enquiry Concerning the Principles of Morals1751 book by Scottish enlightenment philosopher David Hume (1711–1776)
- An Essay Concerning Human Understanding1690 philosophical work by John Locke
- An Essay on ManPoem by Alexander Pope
- An Introduction to the Three Volumes of Karl Marx's Capital2004 book by Michael Heinrich
- Analogia entisPhilosophical claim about the class of language or knowledge of the "being" of God
- Analogy of the divided linePlatonic philosophical analogy
- Analytic philosophy20th-century tradition of Western philosophy
- Analytic reasoningAbility to look at information and discern patterns
- Analytic–synthetic distinctionSemantic distinction in philosophy
- Analytical feminismLine of philosophy
- Analytical ThomismPhilosophical movement
- AnamorphosisOptical distortion used in art
- Anarcho-primitivismAnarchist critique of civilization
- Anarchy, State, and Utopia1974 book by Robert Nozick
- Anatomy of CriticismLiterary criticism book by Northrop Frye
- Ancient Greek philosophyPhilosophical origins and foundation of Western civilization
- Ancient Script TextsIn Chinese philology, the Ancient Script Classics (Chinese: 古文經; pinyin: Gǔwén Jīng; Wade–
- AndirunaPriest initiation hut in Mandaeism
- Andrew AratoHungarian academic
- Andrii BaumeisterUkrainian philosopher (born 1970)
- AndrocentrismCentering a masculine point of view
- Andy ClarkBritish philosopher (born 1957)
- Anecdotal evidenceEvidence relying on personal testimony
- AnekantavadaJain doctrine of many-sidedness
- Anglican Order of PreachersThe Anglican Order of Preachers is an Anglican religious order sometimes loosely referred
- AnglosphereGrouping of English-speaking nations
- AnguishExtreme sadness
- AniconismBanning of material representations
- Anima mundiConcept in metaphysics
- Animal ethicsMoral status and treatment of nonhuman animals
- Ann FergusonAmerican philosopher
- Anne Conway (philosopher)English philosopher (1631–1679)
- Annette BaierNew Zealand philosopher
- Anomalous monismPhilosophical thesis about the mind–body relationship
- Anthony ChemeroAmerican Philosopher
- Anthony Collins (philosopher)Anthony Collins (21 June 1676 O.S. – 13 December 1729 O.S.) was an English philosopher and
- Anthony KennyBritish philosopher (1931–2026)
- Anti-Administration partyUnited States political faction
- Anti-Federalists1780s political movement in the US
- Anti-foundationalismEpistemology without sure premises
- Anti-individualismAnti-individualism (also known as content externalism) is an approach to linguistic meanin
- Anti-Oedipus1972 book by Deleuze and Guattari
- Anti-realismOpposite position of realism
- Anti-statismOpposition to state intervention
- Antigone (Anouilh play)1944 play by Jean Anouilh
- Antigone (Sophocles play)Tragedy by Sophocles
- AntihumanismPhilosophical and social theory critical of traditional humanism
- AntimilitarismOpposition to militarism
- AntinatalismValue judgment that procreation is unethical
- Antinomian ControversyThe Antinomian Controversy, also known as the Free Grace Controversy, was a religious and
- AntinomianismView which rejects laws or legalism
- AntinomyTerm in philosophy
- AntireligionOpposition or hostility to religion
- AntiscienceAttitudes that reject science and the scientific method
- AntisthenesGreek philosopher, founder of Cynicism (c.446–c.366 BCE)
- AntitheismOpposition to theism, and usually to religion
- Antoine ArnauldFrench Catholic theologian, philosopher and mathematician (1612–1694)
- Antoinette Brown BlackwellAmerican philosopher (1825-1921)
- Antonin SertillangesAntonin-Gilbert Sertillanges, O.P. (French: ; 16 November 1863, Clermont-Ferrand - 26 July
- Antonio Caso AndradeMexican philosopher and rector (1883–1946)
- Antony FlewEnglish analytic and evidentialist philosopher (1923–2010)
- Anush (Mandaeism)Uthra in Mandaeism
- Anush bar Danqa7th-century Mandaean priest, scribe, and leader
- ApatheismApathy toward the existence or non-existence of God
- AphorismFigure of speech
- ApokatastasisRestoration to the original or primordial condition
- Apollonian and DionysianPhilosophical and literary concepts
- ApologueAn apologue or apolog (from the Greek ἀπόλογος, a "statement" or "account") is a brief fab
- Appeal to consequencesLogical fallacy
- Appeal to emotionInformal logical fallacy
- Appeal to fearLogical fallacy
- Appeal to flatteryAppeal to flattery is a fallacy in which a person uses flattery, excessive compliments, in
- Appeal to motiveAppeal to motive is a pattern of argument which consists in challenging a thesis by callin
- Appeal to natureRhetorical tactic and potential fallacy
- Appeal to noveltyFallacy in which validity is determined based on novelty
- Appeal to traditionLogical fallacy in which a thesis is deemed correct on the basis of tradition
- ApperceptionSeveral aspects of perception and consciousness
- Applied aestheticsApplication of the philosophy of beauty
- Applied epistemologyApplication of epistemology in specific fields
- Applied ethicsPractical application of moral considerations
- ArbitrarinessNot being determined by reason
- Areopagitica1644 book by John Milton
- AreteGreek philosophical concept
- ArgumentAttempt to persuade or to determine the truth of a conclusion
- Argument from analogyLogical reasoning method
- Argument from authorityLogical fallacy
- Argument from beautyArgument for the existence of God
- Argument from consciousnessArgument for the existence of God
- Argument from degreeArgument for the existence of God
- Argument from desireArgument for the existence of an immortal soul
- Argument from free willContention that omniscience is incompatible with free will
- Argument from ignoranceInformal fallacy
- Argument from loveArgument for the existence of God
- Argument from miraclesArgument for the existence of God
- Argument from moralityArgument for the existence of God
- Argument from nonbeliefPhilosophical argument that asserts an inconsistency with nonbelief and God's existence
- Argument from poor designArgument against assuming the existence of God
- Argument from reasonArgument for the existence of God
- Argument from religious experienceArgument for the existence of God
- Argument from silenceArgument based on lack of statements
- Argumentation theoryAcademic field of logic and rhetoric
- Argumentum ad populumFallacy of claiming the majority is always correct
- Aristotelian ethicsThoughts on how humans should best live
- Ars dictaminisArt of dictation
- Arsenius the GreatArsenius the Deacon, sometimes known as Arsenius of Scetis and Turah, Arsenius the Roman o
- Art and moralityArt and morality have been discussed, compared and linked for as long as they have been id
- Art as ExperienceDewey's aesthetic theory
- Art manifestoPublic declaration of the intentions, motives, or views of an artist or artistic movement
- Arthur DantoAmerican art critic and philosopher (1924–2013)
- Arthur F. BentleyArthur Fisher Bentley (October 16, 1870 – May 21, 1957) was an American political scientis
- Arthur Schopenhauer's aestheticsArthur Schopenhauer's aesthetics result from his philosophical doctrine of the primacy of
- Artistic meritConcept about the value of art objects
- Aryadeva3rd century Sri Lankan philosopher and writer
- Asanga4th-century Mahayana Buddhist scholar
- AsceticismLifestyle of frugality and abstinence
- Asclepius (treatise)The Asclepius, also known as the Perfect Discourse (from the Greek Logos teleios), is a re
- AseityAttribute of God in Christian theology
- Asiatic styleAncient Greek rhetorical tendency in the 3rd century BCE
- Aspects of Christian meditationAspects of Christian meditation was the topic of a 15 October 1989 document of the Congreg
- Association fallacyFormal fallacy
- Association for Symbolic LogicInternational specialist organization
- AssociationismPsychological concept
- Asut MalkiaCommon prayer in Mandaeism
- Aśvaghoṣa2nd century Buddhist Indian poet and philosopher
- Atheism and religionSome movements or sects within traditionally monotheistic or polytheistic religions recogn
- Atheism during the Age of EnlightenmentAtheism, as defined by the entry in Diderot and d'Alembert's Encyclopédie, is "the opinion
- Atheist Alliance InternationalInternational organization
- Atheist's wagerArgument as to whether a good life with a positive legacy necessitates existence of God
- Atheistic existentialismKind of existentialism
- Ātman (Buddhism)Buddhist concept of self
- AtomismNatural philosophy holding that the world comprises fundamental indivisible components
- Attorney–client privilegeConfidentiality of communications with counsel
- Attributes of God in ChristianitySpecific characteristics of God discussed in Christian theology
- Augustinian theodicyChristian theodicy of Augustine of Hippo
- AugustinianismPhilosophical and theological system of Augustine of Hippo
- Australian Academy of the HumanitiesThe Australian Academy of the Humanities was established by Royal Charter in 1969 to advan
- Australian philosophyAustralian philosophy refers to the philosophical tradition of the people of Australia and
- Authenticity (philosophy)Concept in existential psychology and philosophy
- AutonomyCapacity for control, discretion or political self-governance
- AxiologyAxiology (from Greek ἀξία, axia: "value, worth"; and -λογία, -logia: "study of") is the ph
- Axiom independenceAn axiom is independent of a theory , i.e., a collection of sentences, if and only if neit
- ĀyatanaBuddhist term for the six senses
