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- Aaron Ramsey
- Aaron Sherritt
- Ab Anar, Marvdasht
- Ab Anar, Shiraz
- Ab Anarak
- Ab Anbar-e Jahad Ashayiri
- AB III
- Abacus
- Abalone
- ABBA
- Abbasid Caliphate
- Abbeville
- Abbeville, Alabama
- Abbey Road Studios
- Abbie Hoffman
- Abbotsford, Wisconsin
- Abbott, Texas
- Abbreviation
- ABC Kids (US)
- Abd al-Qadir al-Gillani
- Abd al-Rahman al-Sufi
- Abdalá Bucaram
- Abderrahmane Hammad
- Abdication
- Abdominal migraine
- Abduction
- Abdul Ali Mazari
- Abdul Rahman of Negeri Sembilan
- Abdülaziz
- Abdullah Öcalan
- Abdus Salam
- Abe Vigoda
- Abel
- Abel Pardo
- Abel Tasman
- Abelardo Montalvo
- Abelisaurus
- Abell 2029
- Abell 2142
- Abenaki language
- Abercrombie
- Aberdeen
- Aberdeen Airport
- Aberdeen F.C.
- Abhimanyu
- Abhisit Vejjajiva
- Abigail and Brittany Hensel
- Abigail Fillmore
- Abigail Spencer
- Abilene Ruff Riders
- Abilene, Kansas
- Abkhazia
- Ableism
- Abnormal psychology
- Aboriginal art
- Aboriginal Land Trust
- Abortion
- About a Girl (TV series)
- Above mean sea level
- Abraham de Moivre
- Abraham Lincoln
- Abraham Lincoln Presidential Library and Museum
- Abraham Simpson
- Abrahamic religion
- Abrahams Well International Visitors Center
- Abram Games
- Abrictosaurus
- ABS-CBN
- Abscess
- Absheron Economic Region
- Absinthe
- Absolute monarchy
- Absolute threshold of hearing
- Absolute zero
- Absorption
- Abstinence
- Abstraction
- Abu Dawud
- Abu Dhabi Grand Prix
- Abu Simbel temples
- Abydos King List
- AC Cobra
- AC Mogadiscio
- AC Sparta Prague
- Acacia baileyana
- Academic degree
- Academic Ranking of World Universities
- Académie de l'air et de l'espace
- Academy Award for Animated Short Film
- Academy Award for Best Actor
- Academy Award for Best Animated Feature
- Academy Award for Best Costume Design
- Academy Award for Best Director
- Academy Award for Best Documentary (Short Subject)
- Academy Award for Best Documentary Feature
- Academy Award for Best Film Editing
- Academy Award for Best Makeup and Hairstyling
- Academy Award for Best Original Song
- Academy Award for Best Picture
- Academy Award for Best Picture (1920s)
- Academy Award for Best Picture (1930s)
- Academy Award for Best Picture (1940s)
- Academy Award for Best Picture (1950s)
- Academy Award for Best Picture (1960s)
- Academy Award for Best Picture (1970s)
- Academy Award for Best Picture (1980s)
- Academy Award for Best Picture (1990s)
- Academy Award for Best Picture (2000s)
- Academy Award for Best Production Design
- Academy Award for Best Supporting Actor
- Academy Award for Best Supporting Actress
- Academy of Science and Arts of Bosnia and Herzegovina
- Academy of the Hebrew Language
- Acanthocephala
- Acanthopholis
- Acanthostega
- Acanthuridae
- Acanthuroidei
- Acarajé
- Acarina
- Acastus
- Acceleration
- Acceleration due to gravity
- Accent
- Accident
- Accipitridae
- Accipitriformes
- Accompaniment
- Accounting
- Accra
- Accuracy and precision
- Accusative case
- Ace Attorney
- Ace Bailey
- Ace Books
- Aceh
- Acephalgic migraine
- Acetonitrile
- Acetylide
- Achaemenid Empire
- Achernar
- Achilles
- Achondroplasia
- Acid
- Acid rain
- Acid Survivors Foundation
- Acid throwing
- Ackee
- Acne
- Acoelomorpha
- Aconcagua River
- Acorn
- Acorn squash
- Acoustic
- Acoustic guitar
- Acre (state)
- Acritarch
- Acrobatics
- Acrocanthosaurus
- Acromegaly
- Acronym
- Across the Universe (movie)
- Act of Congress
- Actinopterygii
- Action figure
- Action Jackson (1988 movie)
- Activation energy
- Active galactic nucleus
- Active transport
- ActiveX
- Actor
- Acts of the Apostles
- Actuary
- Acupuncture
- Acute accent
- Ad astra (phrase)
- Ad Council
- Ad hominem
- Ada Hegerberg
- Ada Yonath
- Adam Clayton
- Adam Darski
- Adam Gregg
- Adam Hicks
- Adam Jones
- Adam Laxalt
- Adam Małysz
- Adam Mickiewicz
- Adam Ries
- Adam Smith
- Adam Stefan Sapieha
- Ádám Szalai
- Adam Weishaupt
- Adam West
- Adam Wylie
- Adam's apple
- Adamantisaurus
- Adamawa Region
- Adams County, Wisconsin
- Adams Morgan
- Adams–Onís Treaty
- Adana
- Adana massacre
- Adapiformes
- Adaptation
- Adaptive immune system
- Adaptive radiation
- Adaptive unconscious
- Adasaurus
- Adder
- Addition reaction
- Additional Member System
- Additions to Daniel
- Address
- Address bus
- Adela Noriega
- Adèle Dumilâtre
- Adélie Land
- Adelong, New South Wales
- Adenoid
- Adenosine triphosphate
- Adephaga
- Adetokunbo Ademola
- Adi Parashakti
- Adige
- Adipose tissue
- Aditi Sajwan
- Aditya I
- Adjara
- Adjective
- Adjustable wrench
- Adlai Stevenson II
- Adler Planetarium & Astronomy Museum
- Administrative division
- Administrative divisions of Azerbaijan
- Administrative divisions of Croatia
- Administrative divisions of Iran
- Administrative divisions of Mexico
- Administrative units of Pakistan
- Administrator of the Environmental Protection Agency
- Administrator of the Northern Territory
- Admiral
- Admission to the Union
- Adobe
- Adolescence
- Adolf Anderssen
- Adolf Hitler
- Adolf von Henselt
- Adolfo Pérez Esquivel
- Adolfo Suárez
- Adolphe Adam
- Adolphe Nourrit
- Adolphe Sax
- Adour
- Adrastea (moon)
- Adrenal gland
- Adria Airways
- Adriaen Coorte
- Adrian Edmondson
- Adrian Fenty
- Adrian Willaert
- Adriana Lecouvreur
- Adrien Maurice de Noailles, Duke of Noailles
- Adrienne Shelly
- Adultery
- Advance Australia Fair
- Advance Auto Parts Clash
- Advanced Encryption Standard
- Advanced Light Source
- Advanced Photo System
- Advent calendar
- Adventure
- Adventure fiction
- Adventure movie
- Adverb
- Adverse effect (medicine)
- Advertising
- Advocacy
- Adware
- Adyar River
- Adyar, Chennai
- Áed, king of Scots
- Aegean cat
- Aegean Sea
- Aegisthus
- Aegyptosaurus
- Aeneas
- Aeolian Islands
- Aero Caribbean Flight 883
- Aerobics
- Aérocentre
- AeronautX Luftfahrtschule
- Aeronwy Thomas
- Aerosmith
- Aérospatiale SA-330 Puma
- Aeschylus
- Aesculus glabra
- Aesop
- Aestivation
- Aethelbald of Mercia