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- Assassination of Archduke Franz Ferdinand of Austria
- Assassination of John F. Kennedy
- Assassination of Martin Luther King Jr.
- Assembly language
- Assembly line
- Asset
- Asshole
- Assisi
- Assisted suicide
- Associate Justice of the Supreme Court of the United States
- Associated Board of the Royal Schools of Music
- Association
- Association Aéronautique et Astronautique de France
- Association football
- Association of American Universities
- Association of Southeast Asian Nations
- Association of Tennis Professionals
- Assyria
- Assyrian calendar
- Assyrian genocide
- Astarte
- ASTech
- Asterisk
- Asteroid
- Asteroid belt
- Asteroid impact prediction
- Asteroid spectral types
- Asthma
- Astigmatism
- Astley Baker Davies
- Aston University
- Aston Villa F.C.
- Astrid Lindgren
- Astrocyte
- Astrology
- Astrometry
- Astronomer Royal
- Astronomical clock
- Astronomical spectroscopy
- Astronomical unit
- Astronomy
- Astrophysics
- Asura
- Aswan
- Aswan Low Dam
- Asylum
- Asylum seeker
- At bat
- AT&T Stadium
- Atacama Region
- Atahualpa
- Atalanta B.C.
- Atari 2600
- Atari 5200
- Atari Jaguar
- Atauro
- Ataxia
- Atchison County, Kansas
- Atchison, Kansas
- Atchison, Topeka and Santa Fe Railway
- Atelopus
- Aterno-Pescara
- Athanasian Creed
- Atheism
- Athelbald of Wessex
- Athelfrith of Bernicia
- Athelheard of Wessex
- Athelred of Wessex
- Athelstan
- Athelwald of Deira
- Athelwulf of Wessex
- Athena
- Atheris
- Athletic shoe
- Athletics
- Atlanta Campaign
- Atlanta United FC
- Atlantic Beach, Florida
- Atlantic City (movie)
- Atlantic City, New Jersey
- Atlantic cod
- Atlantic Hockey
- Atlantic Ocean
- Atlantic sailfish
- Atlantic salmon
- Atlantic slave trade
- Atlantic Sun Conference
- Atlantic Wall
- Atlas
- Atlas (missile)
- Atlas Cedar
- Atlas V
- Atmel AVR
- Atmosphere of Earth
- Atmosphere of Mars
- Atmospheric chemistry
- Atmospheric circulation
- Atoll
- Atom
- Atomic Betty
- Atomic bombings of Hiroshima and Nagasaki
- Atomic Energy Commission
- Atomic force microscope
- Atomic mass
- Atomic nucleus
- Atomic orbital
- Atomic physics
- Atomic radius
- Atomic theory
- Atomkraft
- Atrax
- Atreyu
- Atropatene
- Atropates
- Attack on Pearl Harbor
- Attacks by Islamic extremists in Bangladesh
- Attention-deficit hyperactivity disorder
- Attica
- Atticus Finch
- Attila the Hun
- Attribute-value system
- Attrition warfare
- Aube (river)
- Aubrey Brain
- Auburn, Alabama
- Aubusson, Creuse
- Auch
- Auckland Grammar School
- Auction
- Aude
- Aude (river)
- Audi Cup
- Audible
- Audie Murphy
- Audio engineer
- Audiophile
- Audit
- Auditorium
- Auditory hallucination
- Audrey Rose
- Audrey Tautou
- Augsburg (district)
- August
- August Ames
- August Belmont
- August Ferdinand Möbius
- August Weismann
- Augustana
- Augustana College (Illinois)
- Auguste Comte
- Auguste Escoffier
- Auguste Rodin
- Augustine
- Augusto Pinochet
- Augustus
- Auhausen
- Aularches miliaris
- Aum Shinrikyo
- Aung San Suu Kyi
- Aura (symptom)
- Aurangabad
- Aurèle Joliat
- Aurich (district)
- Aurigny Air Services
- Aurillac
- Aurochs
- Aurora
- Aurora (mythology)
- Aurornis
- Auschwitz concentration camp
- Austen Chamberlain
- Austerity
- Austin & Ally
- Austin Dillon
- Austin Motor Company
- Austin Powers (character)
- Austin, Texas
- Australasian ecozone
- Australia
- Australia at the 2018 Winter Paralympics
- Australia at the Olympics
- Australia Day
- Australia national cricket team
- Australia national football team
- Australian Aboriginal astronomy
- Australian Aboriginal mythology
- Australian Broadcasting Corporation
- Australian Bureau of Statistics
- Australian cinema
- Australian Convict Sites
- Australian country music
- Australian Defence Force
- Australian dollar
- Australian Electoral Commission
- Australian Football League
- Australian Fossil Mammal Sites (Riversleigh)
- Australian gold rush
- Australian green tree frog
- Australian impact structure
- Australian Kelpie
- Australian Labor Party
- Australian Labor Party (Anti-Communist)
- Australian Labor Party (NSW)
- Australian megafauna
- Australian Mist
- Australian Music Prize
- Australian National Botanic Gardens
- Australian Overland Telegraph Line
- Australian Plains
- Australian Plant Name Index
- Australian pound
- Australian Rules Football
- Australian War Memorial
- Australopithecine
- Australopithecus
- Australopithecus africanus
- Australopithecus anamensis
- Australopithecus garhi
- Australosphenida
- Australovenator
- Austria
- Austria at the 2018 Winter Paralympics
- Austria-Hungary
- Austrian Airlines
- Austrian Football Bundesliga
- Austrian Grand Prix
- Austrian Regional League Central
- Austrian Regional League East
- Austrian Regional League West
- Austrian School
- Austro-Bavarian language
- Autauga County, Alabama
- Authority
- Autism
- Autism rights movement
- Auto Club Speedway
- Auto-Tune
- Autobahn
- Autobiography of Mark Twain
- Autodefensas Unidas de Colombia
- Autodromo Enzo e Dino Ferrari
- Autódromo José Carlos Pace
- Autofocus
- AutoHotkey
- Autoimmunity
- AutoIt
- Autolycus of Pitane
- Automated external defibrillator
- Automated teller machine
- Automatic firearm
- Automatic rifle
- Automation
- Automaton
- Automeris io
- Automobili Turismo e Sport
- Automotive lighting
- Autonomous communities of Spain
- Autonomous Province of Kosovo and Metohija
- Autonomous regions of China
- Autophagy
- Autopoiesis
- Auvergne
- Auvergne-Rhône-Alpes
- Auxerre
- Auxiliary sciences of history
- Auxiliary verb
- Auxin
- Auðr
- Avadi
- Avaí F.C.
- Avalanche
- Avalanche effect
- Avallon
- Avalon (song)
- Avant-garde
- Avatar
- Avatar (2009 movie)
- Avebury
- Avemetatarsalia
- Aventura, Florida
- Avenue Franklin Roosevelt
- Average
- Averroes
- Avery County, North Carolina
- Avery–MacLeod–McCarty experiment
- Aveyron
- Aveyron (river)
- Aviacsa
- Avianca
- Aviation Park MRT station
- Avicenna
- Avignon
- Avijit Roy
- Aviva
- Avogadro's law
- Avolar
- Avon River (Gippsland, Victoria)
- Avril Lavigne
- Avril Lavigne (album)
- Avro Vulcan