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1210 topics starting with A
- A & C Black
- A cappella
- A Christmas Carol
- A Clockwork Orange (film)
- A Day in the Life
- A Dictionary of the English Language
- A Doll's House
- A Hard Day's Night (album)
- A Hard Day's Night (film)
- A History of the University in Europe
- A Letter to a Hindu
- A Lover's Complaint
- A Man on the Moon
- A Midsummer Night's Dream
- A Midsummer Night's Dream (1935 film)
- A Midsummer Night's Dream (Mendelssohn)
- A Philosopher Lecturing on the Orrery
- A Song of Ice and Fire
- A Tolkien Compass
- A Toot and a Snore in '74
- A Tribe Called Quest
- A-001
- A-1 Pictures
- A–A line
- A. A. Milne
- A. C. Bradley
- A. J. Ayer
- A. K. Warder
- A. L. Rowse
- A. Merritt
- A.D. Vision
- A.I. Artificial Intelligence
- A* search algorithm
- Aaliyah
- Aarau
- Aargau
- Aaron Allston
- Aaron Copland
- AB InBev
- ABA–NBA merger
- Abandonment (existentialism)
- Abaris the Hyperborean
- Abba Eban
- Abbas the Great
- Abbasid Caliphate
- Abbey of Saint-Aubin
- Abbey Road
- Abbey Road: 50th Anniversary Edition
- ABC News (Australia)
- ABC News (United States)
- Abdications of Bayonne
- Abe Silverstein
- Abel Seyler
- Abhidharma
- Abiogenesis
- ABKCO Records
- Abkhazia
- Able Archer 83
- Abolitionism
- Abolitionism in the United Kingdom
- Abolitionism in the United States
- Abortion
- Abraham
- Abraham Darby I
- Abraham Darby II
- Abraham Darby III
- Abraham Lincoln
- Abraham Lincoln's first inaugural address
- Abraham Rees
- Abraham Zacuto
- Abrahamic religions
- ABRSM
- Abrupt climate change
- Absolute monarchy
- AbsolutePunk
- Absolutism (European history)
- Absorption spectroscopy
- Abstract algebra
- Abstract art
- Abstract expressionism
- Absurdity
- Abu Dhabi
- Academia.edu
- Academic audit
- Academic Studies Press
- Academy Award for Best Adapted Screenplay
- Academy Award for Best Animated Feature
- Academy Award for Best Director
- Academy Award for Best Original Score
- Academy Award for Best Picture
- Academy Awards
- Academy of Interactive Arts & Sciences
- Academy of Management
- Academy of Political Science
- Academy of Sciences of the Soviet Union
- Academy of Television Arts & Sciences
- Acanthodii
- Accademia Filarmonica di Bologna
- Acceleration
- Accordion
- Accounting
- Ace Books
- Acetic acid
- Acetone
- Achaemenid Empire
- Achievement (heraldry)
- Achilles
- Acid–base reaction
- ACM Conference on Fairness, Accountability, and Transparency
- Acquisitions Incorporated
- Acre
- Acre, Israel
- Acrisure Stadium
- Acrobatics
- Act Naturally
- Act of Mediation
- Acte de déchéance de l'Empereur
- Action game
- Action role-playing game
- Action-adventure game
- Actions in Inner Mongolia (1933–1936)
- Active measures
- Active mobility
- Activism
- Actor
- Acts of Supremacy
- Acupuncture
- Acute accent
- Adam and Eve
- Adam Driver
- Adam of Bremen
- Adam Rapacki
- Adam Silver
- Adam Smith
- Adaptations of The Lord of the Rings
- Adaptive capacity
- Addiction
- Addiction to power in The Lord of the Rings
- Adele
- Adhiṣṭhāna
- Adi Shankara
- Adidas
- Adlertag
- Admiralty (United Kingdom)
- Adobe Flash
- Adolescence
- Adolf Heusinger
- Adolf Hitler
- Adolf Hitler's rise to power
- Adolphe Menjou
- Adonis
- Adoption
- Adoption in ancient Rome
- Adoration of the Magi
- Adposition
- Adrastea (moon)
- Adrian Goldsworthy
- Adriatic Sea
- Adult
- Adult animation
- Adult Swim
- Adultery
- Advaita Vedanta
- Advanced driver-assistance system
- Advances in Space Research
- Adventure (Dungeons & Dragons)
- Adventure fiction
- Adventure game
- Adventures of Huckleberry Finn
- Adverb
- Advertising
- Adweek
- Aegean Sea
- Aeneas
- Aeneid
- Aeronautics
- Aerosmith
- Aerosol
- Aeschylus
- Aesop's Fables
- Aesthetics
- Aether (classical element)
- Afanasievo culture
- Afanasy Fet
- AFC Championship Game
- AFC East
- AFC North
- AFC South
- AFC West
- Affect (psychology)
- Affective computing
- Affinity (law)
- Afghan (ethnonym)
- Afghan conflict
- Afghan mujahideen
- Afghanistan
- AFL–NFL merger
- Afontova Gora
- Africa
- Africa (Roman province)
- Africa Corps (Russia)
- African Americans
- African buffalo
- African traditional religions
- African-American culture
- Afrika Bambaataa
- Afrika Korps
- Afsharid Iran
- Afterlife
- Aftermath of World War I
- Aftermath of World War II
- Aga Khan
- Aga Khan Palace
- Agamemnon
- Agar gun
- Agatha Christie
- Age of Discovery
- Age of Enlightenment
- Age of Mythology
- Ageing
- Agence France-Presse
- Agent (economics)
- Agent Carter (film)
- Agent J
- AGEOD's American Civil War
- Ages of Man
- Aging of Russia
- Aglaophotis
- Agnatha
- Agra
- Agra Fort
- Agra Subah
- Agrarianism
- Agricultural science
- Agriculture
- Agriculture in ancient Rome
- Agrippina the Younger
- Agronomy
- Agrostemma
- Agustín Carstens
- Ahimsa
- Ahmad Husein
- Ahmad ibn Rustah
- Ahmad Shah Bahadur
- Ahmad Shah Durrani
- Ahmadnagar Sultanate
- Ahmedabad
- Ahmednagar
- AI agent
- AI alignment
- AI boom
- AI effect
- AI Overviews
- AI safety
- AI Safety Summit
- AI Seoul Summit
- AI takeover
- AI winter
- Aichi Prefecture
- Aid agency
- Ain-i-Akbari
- Air pollution
- Air raids on Japan
- Air University Press
- Air warfare of World War II
- Airbnb
- Aircraft
- Aircraft carrier
- Airplane
- Airship
- Airway Heights, Washington
- Ajaccio
- Ajanta Caves
- Akbar
- Akbar II
- Akbar's tomb
- Akbari Sarai
- Akbarnama
- Akhenaten
- Aki Shimizu
- Akihabara
- Akihiko Yoshida
- Akira (1988 film)
- Akira Kurosawa
- Akira Nishitani
- Akira Yamaoka
- Akiyuki Nosaka
- Akkadian Empire
- Akron Beacon Journal
- Akron Pros
- Akshobhya
- Akuma (Street Fighter)
- Al Arabiya
- Al Aronowitz
- Al Cervi
- Al Gore
- Al Jazeera English
- Al Jazeera Media Network
- Al Pacino
- Al-Andalus
- Al-Khwarizmi
- Alabama
- Alabama Claims
- Alabama in the American Civil War
- Aladdin
- Alameda, California
- Alamgir II
- Alan Bean
- Alan Dean Foster
- Alan Greenspan
- Alan Lee (illustrator)
- Alan Rickman
- Alan Shepard
- Alan Siegel
- Alan T. Nolan
- Alan Turing
- Alan Turing Institute
- Alan Watts
- Alaska
- Alba Longa
- Alberni Valley
- Albert Camus
- Albert Einstein
- Albert Einstein Archives
- Albert Einstein College of Medicine
- Albert Einstein House
- Albert Einstein Memorial
- Albert Sidney Johnston
- Albine de Montholon
- Albinus of Angers
- Albrecht Adam
- Albrecht Dürer
- Alby, Öland
- Alchemy
- Alcide De Gasperi
- Alcmene
- Alcohol (drug)
- Alcohol in Russia
- Alcohol: Clinical & Experimental Research
- Alcoholic beverage
- Alcoholism
- Aldehyde
- Alder
- Aldous Huxley
- Alec Guinness
- Aleksandr Solzhenitsyn
- Aleksey Konstantinovich Tolstoy
- Alessandro Farnese (cardinal)
- Aleutian Islands campaign
- Alex (Street Fighter)
- Alex Jones
- Alex Raymond
- Alexander Ales
- Alexander Andreyevich Ivanov
- Alexander Blok
- Alexander Glazunov
- Alexander Herzen
- Alexander I of Russia
- Alexander II of Russia
- Alexander III of Russia
- Alexander McQueen
- Alexander Nevsky
- Alexander Pope
- Alexander Prokhorov
- Alexander Pushkin
- Alexander Scriabin
- Alexander the Great
- Alexander von Humboldt
- Alexander Wheelock Thayer
- Alexander Zinoviev
- Alexandre Colonna-Walewski
- Alexandre Dumas
- Alexandre Kojève
- Alexandria
- Alexandria, Virginia
- Alexei Kosygin
- Alexei Leonov
- Alexei Navalny
- Alexey Ivakhnenko
- Alexios I Komnenos
- Alexis de Tocqueville
- Alexis of Russia
- Alexis Sanderson
- AlexNet
- Alfonso XIII
- Alfred A. Knopf
- Alfred Adler
- Alfred Cobban
- Alfred Einstein
- Alfred Hitchcock
- Alfred Kleiner
- Alfred Marshall
- Alfred Nobel
- Alfred Schnittke
- Alfred the Great
- Alfred W. Pollard
- Alfred Worden
- Alfred, Lord Tennyson
- Algae
- Algebra
- Algeria
- Algeria national football team
- Algorand
- Algorithm
- Alì
- Alibaba Group
- Alice Clark (historian)
- Alice's Adventures in Wonderland
- Alien (film)
- Aliens (film)
- Alignment (Dungeons & Dragons)
- Alison Bartosik
- Alison Weir
- Alita: Battle Angel
- Aliyah
- Alkali Act 1863
- All India Congress Committee
- All Things Considered
- All This and World War II
- All Those Years Ago
- All You Need Is Love
- All-America Football Conference
- All-India Muslim League
- All-NBA Team
- All-Russian Central Executive Committee
- All's Well That Ends Well
- Alla Pugacheva
- Allahabad Fort
- Allan Nevins
- Allan Williams
- Allegiant Stadium
- Allen & Unwin
- Allen Klein
- Allen Lane
- Allen Lawrence Pope
- Allen Newell
- Allergy
- Allied intervention in the Russian Civil War
- Allied invasion of Italy
- Allied invasion of Sicily
- Allied leaders of World War II
- Allied plans for German industry after World War II
- Allied prisoners of war of Japan
- Allied submarines in the Pacific War
- Allied-occupied Austria
- Allied-occupied Germany
- Allies of World War I
- Allies of World War II
- Allison Shearmur
- Alliterative verse
- AllMusic
- Alloy
- Alluvial fan
- Almaty
- Almaz
- Almond
- Almoner
- Aloysia Weber
- Alpha Centauri
- Alpha Group
- Alphabet
- Alphabet Inc.
- AlphaEvolve
- AlphaGeometry
- AlphaGo
- AlphaGo versus Ke Jie
- Alps
- Alsergrund
- Altai Mountains
- Altaic languages
- Altar
- Altar of Domitius Ahenobarbus
- Alternate history
- Alternating current
- Alternating decision tree
- Alternative medicine
- Altes Museum
- Aluminium
- Alvin Hansen
- Alzheimer's disease
- Amalthea (moon)
- Amanda Askell
- Amanita muscaria
- Amazon (company)
- Amazon Alexa
- Amazon Bedrock
- Amazon Freevee
- Amazon Prime
- Amazon Prime Video
- Amazon rainforest
- Amazon River
- Amazon Web Services
- Amazons
- Ambassador
- Amber Road
- Amberley Publishing
- Ambio
- Ambon, Maluku
- Ambrogio Lorenzetti
- Ambrose Bierce
- Ambrose Burnside
- AMD
- Amduat
- Amenhotep III
- America First Field
- American Academy of Arts and Sciences
- American Academy of Political and Social Science
- American Airlines
- American Airlines Center
- American animation
- American Anime Awards
- American Association for the Advancement of Science
- American Bandstand
- American Basketball Association
- American Battlefield Trust
- American bison
- American Book Company (1890)
- American Bowl
- American Brahman
- American Broadcasting Company
- American Civil War
- American Civil War Centennial
- American Civil War prison camps
- American comic book
- American Economic Association
- American Economic Review
- American football
- American Football Conference
- American football in the United States
- American Football League
- American Football League (1936)
- American Geophysical Union
- American Graffiti
- American handball
- American imperialism
- American Invitational Mathematics Examination
- American Journal of Physics
- American Mafia
- American nationalism
- American Philosophical Society
- American Physical Society
- American Political Science Association
- American Revolution
- American Revolutionary War
- American Samoa
- American system of manufacturing
- Americanization
- Americium
- Amerigo Vespucci
- Amgen
- Amiga
- Amiga CD32
- Amino acid
- Amir Ghalenoei
- Amish
- Amitābha
- Ammianus Marcellinus
- Amnesia
- Amnesty International
- Amor Vincit Omnia (Caravaggio)
- Amos Tversky
- Ampère Museum
- Amphetamine
- Amphibian
- Amsterdam
- Amstrad CPC
- Amun
- Amusement arcade
- Amusement park
- Amy Finkelstein
- Amy Winehouse
- An Essay on the Nature and Significance of Economic Science
- An Inconvenient Truth
- An Occurrence at Owl Creek Bridge
- An Shigao
- Anabolic steroid
- Anaconda Plan
- Anadolu Agency
- Anagarika Dharmapala
- Anal sex
- Analgesic
- Analytic geometry
- Anapanasati
- Anarchism
- Anarcho-primitivism
- Anat
- Anatolia
- Anatoly Khazanov
- Anatomy
- Anattā
- Ancestral Puebloans
- Anchises
- Ancient Beringian
- Ancient Carthage
- Ancient Egypt
- Ancient Egyptian creation myths
- Ancient Egyptian funerary texts
- Ancient Egyptian literature
- Ancient Egyptian religion
- Ancient Greece
- Ancient Greek
- Ancient Greek art
- Ancient Greek boxing
- Ancient Greek comedy
- Ancient Greek dialects
- Ancient Greek religion
- Ancient history
- Ancient North Eurasian
- Ancient Roman architecture
- Ancient Roman engineering
- Ancient Roman philosophy
- Ancient Roman pottery
- Ancient Roman technology
- Ancient Rome
- Ancient Rome and wine
- And did those feet in ancient time
- Andean civilizations
- Andes
- Andhra Pradesh
- Andijan
- András Hess
- André Breton
- André de Gouveia
- André de Resende
- André Gide
- André Wink
- Andrea Bargnani
- Andrea Bartz
- Andrea Mantegna
- Andreas Palaiologos
- Andreas Vesalius
- Andrei Bely
- Andrei Kirilenko
- Andrei Rublev
- Andrei Sakharov
- Andrei Tarkovsky
- Andrés Guardado
- Andrew Bogut
- Andrew Fleming West
- Andrew Hull Foote
- Andrew Jackson
- Andrew Johnson
- Andrew Lambert
- Andrew Lloyd Webber
- Andrew Ng
- Andrew Wallace-Hadrill
- Andrew Wiggins
- Andrey Bogolyubsky
- Andrey Vyshinsky
- Android (operating system)
- Andy Serkis
- Andy Warhol
- Andy White (drummer)
- Anesthesia
- Angel
- Angela Davis
- Angelica archangelica
- Anger
- Angkor Thom
- Angle
- Angles (tribe)
- Anglesey
- Anglican Communion
- Anglican Diocese of Worcester
- Anglicanism
- Anglo-German Naval Agreement
- Anglo-Iraqi War
- Anglo-Persian Oil Company
- Anglo-Polish alliance
- Anglo-Soviet Agreement
- Anglo-Soviet invasion of Iran
- Angst
- Angular momentum
- Angus Deaton
- Angus Maddison
- Aniconism
- Animage
- Animal
- Animal husbandry
- Animal welfare
- Animals in space
- Animated series
- Animation
- Animation (journal)
- Animation Kobe
- Anime
- Anime and manga
- Anime club
- Anime Expo
- Anime Grand Prix
- Anime Limited
- Anime music video
- Anime News Network
- Anime-influenced animation
- AnimeNation
- Animerica
- Anna Akhmatova
- Anna Bolena
- Anna Kozlova
- Anna Maria Mozart
- Anna of Russia
- Anna Schwartz
- Annalen der Physik
- Annals (Tacitus)
- Annals of Ulster
- Annapurna Interactive
- Annates
- Anne Boleyn
- Anne Gainsford
- Anne Hankford
- Anne Hathaway (wife of Shakespeare)
- Anne Hoo
- Anne of Cleves
- Anne of the Thousand Days
- Annecy International Animation Film Festival
- Annelid
- Annemarie Schimmel
- Annie Besant
- Annie Hall
- Anniversary
- Annus mirabilis
- Annus mirabilis papers
- Anonymity
- Anonymous Content
- Anschluss
- Ant
- Antagonist
- Antarctic Treaty System
- Antarctica
- Antebellum Puzzle
- Antenna (radio)
- Anthology series
- Anthony Daniels
- Anthrax
- Anthropic
- Anthropology
- Anthropometry
- Anthropomorphism
- Anti-aircraft warfare
- Anti-clericalism
- Anti-Comintern Pact
- Anti-communism
- Anti-submarine warfare
- Anti-tank mine
- Anti-tank warfare
- Anti-war protests in Russia (2022–present)
- Antibiotic
- Antibody
- Antietam National Battlefield
- Antigone (Anouilh play)
- Antigua and Barbuda
- Antinous Mondragone
- Antioch
- Antioch mosaics
- Antiques Roadshow
- Antisemitism in the United Kingdom
- Antoine Christophe Saliceti
- Antoine de Castelnau
- Antoine Lavoisier
- Antoine-Alphonse Montfort
- Antoine-Jean Gros
- Anton Chekhov
- Anton Rubinstein
- Anton Walter
- Antonín Dvořák
- Antonine Plague
- Antonine Wall
- Antoninus Liberalis
- Antoninus Pius
- Antonio Bonfini
- Antonio Cabrini
- Antonio Carbajal
- Antonio da Sangallo the Younger
- Antonio de Cabezón
- Antonio de Nebrija
- António Galvão
- Antonio Salieri
- Antony and Cleopatra
- Antony Beevor
- Antwerp
- Anubis
- Anwar Sadat
- Anxiety
- Anxiety disorder
- ANZUS
- Aoife Ní Fhearraigh
- AP NFL Comeback Player of the Year
- Apartheid
- Apartment
- Apatosaurus
- Apatrapya
- Ape
- Aphrodisias
- Aphrodite
- Apicius
- Apocalypse Now
- Apollo
- Apollo (spacecraft)
- Apollo 1
- Apollo 10
- Apollo 11
- Apollo 11 (1996 film)
- Apollo 11 (2019 film)
- Apollo 11 in popular culture
- Apollo 12
- Apollo 13
- Apollo 13 (film)
- Apollo 14
- Apollo 15
- Apollo 16
- Apollo 17
- Apollo 18 (film)
- Apollo 4
- Apollo 5
- Apollo 6
- Apollo 7
- Apollo 8
- Apollo 9
- Apollo Applications Program
- Apollo command and service module
- Apollo Guidance Computer
- Apollo Lunar Module
- Apollo Lunar Surface Experiments Package
- Apollo program
- Apollo Telescope Mount
- Apollo–Soyuz
- Apollodorus of Athens
- Apollodorus of Damascus
- Apollonius of Rhodes
- Apology (Plato)
- Apotheosis
- Appalachian Mountains
- Appeal
- Appeasement
- Appellate court
- Appendix N
- Appian Way
- Apple
- Apple Boutique
- Apple Corps
- Apple Corps v Apple Computer
- Apple Inc.
- Apple Music
- Apple of Discord
- Apple Records
- Application-specific integrated circuit
- Appomattox Court House National Historical Park
- Appomattox Station
- Appomattox, Virginia
- Apprenticeship learning
- Apricot
- April O'Neil
- Apuleius
- Aqua Claudia
- Aqua Marcia
- Aquaculture
- Aquarium
- Aquarium (band)
- Aquitanian language
- Arab world
- Arab–Byzantine wars
- Arab–Israeli conflict
- Arabic
- Arabic numerals
- Arabic script
- Araceae
- Arachnid
- Aragorn
- Arakan campaign (1942–1943)
- Aramaic
- Aranyaka
- Arca Continental
- Arcade game
- Arcade video game
- Arcadius
- Archaea
- Archaeology
- Archbishop of Canterbury
- Archduchy of Austria
- Archduke
- Archduke Charles, Duke of Teschen
- Archer Aviation
- Archibald Wavell, 1st Earl Wavell
- Archie Comics
- Archimedes
- Architectural engineering
- Architecture
- Architecture of Russia
- Architecture of Star Wars
- Arcole
- Arctic
- Arctic exploration
- Arctic Ocean
- Arctic policy of Russia
- Arctic sea ice decline
- Ardeatine massacre
- Arden family
- Ardennes
- Area
- Ares
- Ares (magazine)
- Aretha Franklin
- Argentina
- Argentina national football team
- Argo
- Argon
- Argonautica
- Argonauts
- Argumenty i Fakty
- Arhat
- Aria (band)
- Ariana Grande
- Ariel (moon)
- Arish
- Aristarchus of Samos
- Aristocracy (class)
- Aristophanes
- Aristotele Fioravanti
- Aristotle
- Arithmetic
- Arizona
- Arizona Cardinals
- Arizona State University
- Arkaim
- Arkansas
- Arkansas in the American Civil War
- Arlington, Texas
- Armand Hammer
- Armenian genocide
- Armenian language
- Armillary sphere
- Armistice of 22 June 1940
- Armistice of Cassibile
- Armour
- Arms Control Association
- Army Group A
- Army Group B
- Army Group Centre
- Army Group E
- Army Group F
- Army Group North
- Army Group South
- Army Group South Ukraine
- Army of England
- Army of Italy (France)
- Army of Mississippi
- Army of Northern Virginia
- Army of Tennessee
- Army of the Cumberland
- Army of the Gulf
- Army of the Interior
- Army of the Mughal Empire
- Army of the North (France)
- Army of the Peninsula
- Army of the Potomac
- Army of the Shenandoah (Confederate)
- Army of the Tennessee
- Army of the West (France)
- Army of Virginia
- Army of West Mississippi
- Arnobius
- Arnold Hills
- Arnold Schoenberg
- Arnold Schwarzenegger
- Arnold Toynbee (historian, born 1852)
- Arnolfo di Cambio
- Arranged marriage
- Arrietty
- Arrowhead Stadium
- Ars Technica
- Arsenal
- Arsenal F.C.
- Arsenal of Democracy
- Arsène Wenger
- Arsenic
- Art
- Art Deco
- Art history
- Art Nouveau architecture in Russia
- Art of ancient Egypt
- Artemis
- Artemis II
- Artemis III
- Artemis program
- Arthritis
- Arthropod
- Arthur Adamov
- Arthur C. Clarke
- Arthur Conan Doyle
- Arthur E. Bryson
- Arthur Eddington
- Arthur Evans
- Arthur Mendel
- Arthur Miller
- Arthur Samuel (computer scientist)
- Arthur Wellesley, 1st Duke of Wellington
- Arthur, Prince of Wales
- Artificial general intelligence
- Artificial intelligence
- Artificial Intelligence Act
- Artificial intelligence in Wikimedia projects
- Artificial intelligence industry in Canada
- Artificial Intelligence: A Modern Approach
- Artificial Life (journal)
- Artificial organ
- Artillery
- Artillery battery
- Artis Gilmore
- Artists of the Tudor court
- Arverni
- Arvydas Sabonis
- Arwen
- Arya (Buddhism)
- Aryan
- As (Roman coin)
- As You Like It
- AS-101
- AS-105
- AS-201
- AS-202
- AS-203
- Asaf-ud-Daula
- Asanga
- Asava
- Asbestos
- Ascanio in Alba
- ASEAN
- Asexual reproduction
- Asgard
- Ashgate Publishing
- Ashita no Joe
- Ashkenazi Jews
- Ashley Wood
- Ashoka
- Ashton Gate, Bristol
- Asia
- Asia Power Index
- Asia-Pacific Economic Cooperation
- Asian Educational Services
- Asian Football Confederation
- Asian Survey
- Asilomar Conference on Beneficial AI
- Ask and Embla
- Asparagus
- Assam
- Assassin's Creed
- Assassin's Creed Valhalla
- Assassination of Abraham Lincoln
- Assassination of Alexander II of Russia
- Assassination of John F. Kennedy
- Assassination of Julius Caesar
- Assassination of Mahatma Gandhi
- Assault
- Asser
- Assianism
- Assisted migration
- Associated Press
- Associated Television
- Association football
- Association for Slavic, East European, and Eurasian Studies
- Association for the Advancement of Artificial Intelligence
- Assyria
- Asteroid
- Asteroid belt
- Asteroid family
- Asthma
- Astrakhan Khanate
- Astrid Kirchherr
- Astrid Lindgren
- Astro Bot
- Astro Boy
- Astro Boy (1963 TV series)
- Astrobiology Magazine
- Astrobotic Technology
- Astrology
- Astronaut
- Astronomical filter
- Astronomical object
- Astronomical unit
- Astronomy
- Astronomy (magazine)
- Astronomy & Astrophysics
- Astronomy & Geophysics
- Astronomy in the medieval Islamic world
- Astrophysics
- Asymmetric federalism
- AT&T Stadium
- Atacama Large Millimeter Array
- Atal Bihari Vajpayee
- Atalanta
- Atari
- Atari 2600
- Atari ST
- Atco Records
- Atheism
- Athena
- Athenian democracy
- Athens
- Atia Mosque
- Atil
- Atlanta
- Atlanta Falcons
- Atlanta Hawks
- Atlanta United FC
- Atlantic Charter
- Atlantic City, New Jersey
- Atlantic Council
- Atlantic Division (NBA)
- Atlantic meridional overturning circulation
- Atlantic multidecadal oscillation
- Atlantic Ocean
- Atlantis
- Atlas F.C.
- Atlas Obscura
- Atmosphere of Earth
- Atmospheric methane
- Atmospheric science
- Atom
- Atomic bombings of Hiroshima and Nagasaki
- Atreus
- Atrium Libertatis
- Attack on Mers-el-Kébir
- Attack on Pearl Harbor
- Attack on Titan (TV series)
- Attempted assassination of Pope John Paul II
- Attention (machine learning)
- Attention deficit hyperactivity disorder
- Attic (architecture)
- Attila
- Attrition warfare
- Atum
- Aubrey Beardsley
- Auburn hair
- Auburn University
- Auckland University of Technology
- Audre Lorde
- Audrey Hepburn
- Augsburg
- Augsburg Cathedral
- August Wilhelm Schlegel
- Augustan literature (ancient Rome)
- Auguste de Marmont
- Auguste Rodin
- Augustin Robespierre
- Augustine of Hippo
- Augustus
- Augustus (title)
- Augustus of Prima Porta
- Auk
- Aula Palatina
- Auld Alliance
- Aurangabad
- Aurangzeb
- Aurelian
- Ausiàs March
- Ausonius
- Austen Chamberlain
- Austin, Texas
- Australia
- Australia (continent)
- Australia men's national soccer team
- Australian Associated Press
- Australian Broadcasting Corporation
- Australian Institute of International Affairs
- Austria
- Austria national football team
- Austria-Hungary
- Austrian Empire
- Austrian school of economics
- Austro-Hungarian Army
- Austro-Turkish War (1788–1791)
- Authenticity (philosophy)
- Authoritarianism
- Autism
- Autocracy
- Autoimmune disease
- Automated planning and scheduling
- Automated reasoning
- Autonomous administrative division
- Autopsy
- Autun
- Auxonne
- Avalanche (blockchain platform)
- Avalokiteśvara
- Avant-garde
- Avaricum
- Avatar: The Last Airbender
- Ave verum corpus (Mozart)
- Avengers (comics)
- Avengers: Age of Ultron
- Avengers: Doomsday
- Avengers: Endgame
- Avengers: Infinity War
- Aventine Hill
- Averroes
- Avicenna
- Avicii Arena
- Avidyā (Buddhism)
- Avlida
- Avocado
- Axis occupation of Greece
- Axis powers
- Ayurveda
- Ayutthaya Kingdom
- Azalea
- Azerbaijan
- Azerbaijan People's Government
- Azores
- Aztec religion
- Aztecs