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Questions and answers
- Æthelbald of Mercia (d. 757) — King and Mercian Overlord Aethelbald of Mercia
- Æthelred I of Mercia Aethelred I of Mercia
- Afa Anoaʻi — Samoan American wrestler, tag team legend and trainer Afa Anoaʻi
- Afar Region (Ethiopia) Afar Region
- Afar Triangle (Afar Depression) Afar Triangle
- AFC Ajax — Amsterdam's historic football club and academy AFC Ajax
- Affinity (kinship by marriage) Affinity
- Affricate (speech sound) Affricate
- Afghan Hound
- Afghan National Anthem (Millî Surûd) Afghan National Anthem
- Afghanistan: geography, history, society, and contemporary issues Afghanistan
- AFI's 100 Years of Musicals (2006) AFI's 100 Years of Musicals
- AFI's 100 Years... 100 Laughs
- AFI's 100 Years...100 Movies — the American Film Institute's 1998 Top Films List AFI's 100 Years... 100 Movies
- AFI's 100 Years...100 Stars AFI's 100 Years... 100 Stars
- AFI's 100 Years...100 Thrills AFI's 100 Years... 100 Thrills
- Afif-Abad Garden — historic Qajar garden and museum in Shiraz Afif-Abad Garden
- Afonso IV of Portugal (the Brave) — king from 1325 to 1357 Afonso IV of Portugal
- Africa: overview of geography, peoples, history and environment Africa
- Africa (Roman province) Africa Province
- Africa‑Eurasia (Afro‑Eurasia): geography, history and significance Africa-Eurasia
- African Americans: identity, history, distribution, and cultural contributions African Americans
- African Americans in the American Civil War
- African elephant: overview, biology, behavior and conservation African elephant
- African forest elephant (Loxodonta cyclotis) African forest elephant
- African National Congress (ANC) African National Congress
- African palm civet (Nandinia binotata): overview and natural history African palm civet
- African penguin (Spheniscus demersus) African penguin
- African Plate: structure, motion, and geological significance African plate
- African red toad (Schismaderma carens) African red toad
- African Sanctus — David Fanshawe's choral work blending Mass and African field recordings African Sanctus
- African Union: Purpose, Structure, History and Future Goals African Union
- African wildcat (Felis silvestris lybica) African wildcat
- African-American music: origins, styles, and cultural influence African-American music
- African-American Vernacular English the way that some African-American people talk in English
- Africanized honey bee Africanized bee
- Afrikaans: origin, features, and contemporary role Afrikaans
- Afrikaans Language Monument (Afrikaanse Taalmonument) — Paarl, South Africa Afrikaans Language Monument
- Afro (hairstyle): definition, history, care, and cultural significance Afro
- Afro-Haitians: Origins, History, Culture, and Demography Afro-Haitians
- Afrotheria: the African-rooted clade of placental mammals Afrotheria
- Afrotropic (Afrotropical realm): geography, biodiversity and conservation Afrotropic
- Afrovenator — Middle Jurassic African theropod Afrovenator
- The Afternoon of a Faun (Nijinsky) Afternoon of a Faun (Nijinsky)
- Aga Khan II (Aqa Ali Shah) — 47th Nizari Ismaili Imam Aga Khan II
- Aga Khan III: Muslim leader, reformer and international statesman Aga Khan III
- Aga Khan IV (Karīm al-Ḥussayni) — 49th Imam and Founder of the Aga Khan Development Network Aga Khan IV
- Again (song title and album — multiple musical works) Again
- Against All Odds (Take a Look at Me Now)
- Against the Grain — Bad Religion (1990 album) Against the Grain
- Red-eyed tree frog (Agalychnis callidryas) Agalychnis callidryas
- Agaricomycetes: the mushroom-forming fungi Agaricomycetes
- Agate: banded chalcedony variety of quartz, formation, types, and uses Agate
- Agatha Christie: life, detective fiction, and lasting legacy Agatha Christie
- Agathemera (chinchemolle): an isolated South American phasmid Agathemera
- Agathis (kauri): evergreen conifer genus of the southern hemisphere Agathis
- Agavaceae: the agave and related plant family Agavaceae
- Agave nectar: production, characteristics, uses and health notes Agave nectar
- Age Ain't Nothing But a Number (Aaliyah album) Age Ain't Nothing But a Number
- Age of Consent: Legal Thresholds for Sexual Consent Age of consent
- Age of Discovery: European maritime expansion and global contact Age of Discovery
- Age of Enlightenment: Origins, Core Ideas, and Lasting Influence Age of Enlightenment
- Age of Majority
- Age of the Earth: how scientists determine Earth's age Age of the Earth
- Age of the Universe
- Ageing: biological mechanisms, evolutionary explanations, and societal effects Ageing
- Agen, prefecture of Lot-et-Garonne in southwestern France Agen
- Agency: organizations, legal relationships, and roles acting on others' behalf Agency
- Agent: roles, types, and meanings Agent
- Agent Orange (band): American surf‑punk pioneers from Orange County Agent Orange (band)
- Ages of Man: the Five Hesiodic Eras from Golden to Iron Ages of Man
- Aggregate fruit: formation, types, and distinctions Aggregate fruit
- Aggression: forms, causes, and functions in humans and animals Aggression
- Agilbert: 7th-century Frankish bishop and missionary Agilbert
- Agilodocodon: a small, likely arboreal docodont from the Middle Jurassic Agilodocodon
- Agkistrodon contortrix (Eastern copperhead) Agkistrodon contortrix
- Agly (river in southern France) Agly
- Agnatha: jawless fishes and the origins of vertebrates Agnatha
- Agnes of God (1985 film) Agnes of God (movie)
- Ágnes Osztolykán — Hungarian Roma activist and politician Ágnes Osztolykán
- Agnès Sorel (1421–1450) Agnès Sorel
- Agnez Mo (album)
- Agni — Vedic god of fire and sacrificial mediator Agni
- Agnosticism
- Agonist (pharmacology and physiology) Agonist
- Agoraphobia: overview, symptoms, causes, diagnosis and treatment Agoraphobia
- Agostinho Neto: Angolan physician, poet, and first president Agostinho Neto
- Agout — river of southern France Agout
- Agra district (Uttar Pradesh, India) Agra district
- Agreement: overview, elements, history, and common uses Agreement
- Agricultural Adjustment Act (1933) — New Deal farm policy Agricultural Adjustment Act
- Agricultural revolution: major transitions in farming and food production Agricultural revolution
- Agriculture and Fisheries (functional constituency, Hong Kong) Agriculture and Fisheries (constituency)
- Aguascalientes City
- Aguascalientes Municipality the capital of the state of Aguascalientes
- Agustín Ross Cultural Centre (Centro Cultural Agustín Ross) Agustín Ross Cultural Centre
- Agustín Ross Park (Pichilemu, Chile) Agustín Ross Park
- Ahab (King of Israel) Ahab
- Ahaziah of Israel (son of Ahab) — king of the northern kingdom Ahaziah of Israel
- Ahmad Shah Durrani (c.1723–1773) Ahmad Shah Durrani
- Ahmad Shah Massoud: Afghan commander and leader of the Northern Alliance Ahmad Shah Massoud
- Ahmadiyya: origins, beliefs, organization, and global presence Ahmadiyya
- Ahmed Hassan (Egyptian footballer) Ahmed Hassan
- Ahmed Hassan al-Bakr
- Ahmed Mohamed clock incident
- Ahmed Rajib Haider
- Ahmed Rushdi: Pakistani Playback Singer and Pop Pioneer Ahmed Rushdi
- Ahmed Zewail: Pioneer of Femtochemistry and Science Advocate Ahmed Zewail
- Ahmedabad: Gujarat's largest city, history, culture and economy Ahmedabad
- Ahn Cheol-soo: entrepreneur, physician, academic and political leader Ahn Cheol-soo
- Ahrweiler (district)
- Ai Takahashi — Japanese pop singer and former Morning Musume leader Ai Takahashi
- Aichach-Friedberg: rural district in Swabia, Bavaria Aichach-Friedberg
- Aida (opera) Aida
- Aidi (Chien de l'Atlas): Moroccan livestock guardian and hunting dog Aidi
- AIDS orphan
- AIESEC: International student leadership and exchange organization AIESEC
- Aiguille de Chambeyron
- Aileen Hernandez: Civil Rights and Women’s Rights Activist Aileen Hernandez
- AIM-9 Sidewinder: Short-range infrared air-to-air missile AIM-9 Sidewinder
- Aimaq dialect (Persian ethnolect) Aimaq dialect
- Aimaq people: Persian-speaking nomadic and semi-nomadic tribes Aimaq people
- Ain (French department) Ain
- Ain't It Funny (Murder Remix)
- Ain't Nobody — Rufus and Chaka Khan (1983 song) Ain't Nobody
- Aintree: village, racecourse and motorsport site near Liverpool Aintree
- Ainu language: overview, history, dialects and contemporary revival Ainu language
- Air Åland — regional virtual airline serving Åland (2005–2012) Air Åland
- Air Astana — Kazakhstan's national airline and scheduled carrier Air Astana
- Air Berlin — German airline (founded 1978, ceased 2017) Air Berlin
- Air Canada — Canada's largest airline Air Canada
- Air charter: renting whole aircraft for passengers, cargo and special missions Air charter
- Air China Flight 129 (2002 Busan crash) Air China Flight 129
- Air conditioner
- Air Florida Flight 90: 1982 Washington DC Crash and Rescue Air Florida Flight 90
- Air France Flight 358 (2005) — Toronto Pearson runway overrun Air France Flight 358
- Air India Flight 182 bombing (June 23, 1985) Air India Flight 182
- Air Namibia — history, operations, fleet and legacy Air Namibia
- Air navigation: principles, methods, history, and modern practice Air navigation
- Air New Zealand
- Air Nigeria (formerly Virgin Nigeria) — history of a Nigerian flag carrier Air Nigeria
- Air Niugini — Papua New Guinea's flag carrier Air Niugini
- Air pollution: causes, effects, history, and responses Air pollution
- Air raid on Bari (2 December 1943): harbor attack and mustard gas release Air raid on Bari
- Air Tahiti Nui — international airline of French Polynesia Air Tahiti Nui
- Air traffic control: functions, structure, history and safety systems Air traffic control
- Airbag (automotive restraint device) Airbag
- Airbus SE: European Aircraft Manufacturer Airbus
- Airbus A300 jet airliner which was made by Airbus
- Airbus A320 family: a versatile narrow-body jet airliner series Airbus A320 family
- Airbus A320 family family of jet airliners
- Airbus A330: twin‑engine wide‑body airliner and its variants Airbus A330
- Airbus Training Centre Europe — Blagnac (Toulouse) training facility Airbus Training Centre Europe
- Aircraft: types, how they fly, history, and common uses Aircraft
- Airedale Terrier: history, appearance, and roles Airedale Terrier
- Airline alliance
- Airline hub: purpose, operation, and role in the network Airline hub
- Airport: functions, parts, history, and types Airport
- Airport Terminal: Design, Function, Types, and Notable Examples Airport terminal
- Airship — lighter-than-air powered aircraft Airship
- Airstone (aquarium and hydroponic diffuser) Airstone
- Aishwarya Sen — Indian actress in Bengali television Aishwarya Sen
- Aisne (department in northern France) Aisne
- Aisne (river): geography, history, and significance Aisne (river)
- Aitch (rapper) — English rapper and grime MC from Manchester Aitch (rapper)
- Ajaccio: Corsican capital, port city and birthplace of Napoleon Ajaccio
- Ajanta Caves — Buddhist rock-cut monuments in Maharashtra, India Ajanta Caves
- Ajay River: course, ecology, history and human use Ajay River
- Ajda Pekkan — Turkish pop singer and actress Ajda Pekkan
- Ajdovščina small Slovenian town
- Ajmer (historic city in Rajasthan, India) Ajmer
- AK-47: design, history, variants and global impact AK-47
- Akara (Acarajé): West African bean fritter and Afro-Brazilian street food Akara
- Akari (satellite): Japan’s infrared space observatory Akari (satellite)
- AKB48 (Japanese idol group) AKB48
- Akbar: Emperor, Reformer, and Patron of Mughal India Akbar
- Akershus (former county of Norway) Akershus
- Akhilesh Yadav — Indian politician and former Chief Minister of Uttar Pradesh Akhilesh Yadav
- Akiba Rubinstein
- Akihito: Emperor of Japan and the Heisei Era Akihito
- Akilattirattu Ammanai (Akilam): principal scripture of Ayyavazhi Akilattirattu Ammanai
- Akina Nakamori — Japanese pop singer and actress Akina Nakamori
- Akinchi: the first Azerbaijani-language newspaper in the Russian Empire Akinchi
- Akita (city) — capital of Akita Prefecture on Honshu, Japan Akita (city)
- Akkad and the Akkadian Empire Akkad
- AKMU (Akdong Musician) — South Korean sibling music duo AKMU
- Akrisios
- Akseli Gallen-Kallela
- Akwid (Mexican‑American hip hop duo) Akwid
- Al Ahly SC
- Al Ain city in the United Arab Emirates
- Al Anbar Governorate
- Al Brady, 1930s American armed robber and 'Public Enemy' Al Brady
- Al Gore: American politician, vice president, and climate advocate Al Gore
- Al Hilal SFC — prominent Saudi football club from Riyadh Al Hilal SFC
- Al Jazeera: Qatar-based international news network Al Jazeera
- Al Jolson: Entertainer, Early Sound-Film Star, and Controversial Figure Al Jolson
- Al Shaheen Oil Field: Qatar offshore petroleum development Al Shaheen Oil Field
- Al Smith (1873–1944) — New York governor and 1928 Democratic nominee Al Smith
- Al-Ahsa Oasis (Al-Hasa) — large historic oasis in eastern Saudi Arabia Al-Ahsa Oasis
- Al-Andalus: Muslim Iberia and its cultural legacy Al-Andalus
- Al-Aqsa Mosque (Al-Masjid al-Aqsa) Al-Aqsa Mosque
- Al-Askari Mosque (al-ʿAskariyya) — historic Shīʿa shrine in Samarra Al-Askari mosque
- Al-Khwarizmi: Persian mathematician, astronomer and pioneer of algebra Al-Khwarizmi
- Al‑Masih ad‑Dajjal: the False Messiah in Islamic Eschatology Al-Masih ad-Dajjal
- Al‑Masjid an‑Nabawi (The Prophet's Mosque) in Medina Al-Masjid an-Nabawi
- Al-Nabk District: mountain town north of Damascus Al-Nabk District
- Al‑Nusra Front (Jabhat al‑Nusra): origins, role and evolution Al-Nusra Front
- Al‑Qa'im bi‑Amrillah — Fatimid caliph and Ismaʿili imam Al-Qa'im (Fatimid caliph)
- al-Qaeda: origins, structure, ideology, and major attacks al-Qaeda
- Ala-ud-din Khalji
- Alabaster, Alabama — southern suburb of Birmingham in Shelby County Alabaster, Alabama
- Aladdin (1992 film) Aladdin (1992 movie)
- Alagnon (river of the Massif Central, France) Alagnon
- Alagoas — Brazilian coastal state known for beaches, lagoons and tourism Alagoas
- Alain Bui — French information technology researcher and university president Alain Bui
- Alain Delon: French actor and screen icon Alain Delon
- Alain LeRoy Locke
- Alam Shah — last Sayyid ruler of Delhi Alam Shah
- Alamosaurus (Late Cretaceous titanosaur) Alamosaurus
- Alan Alda
- Alan Bates (1934–2003): British stage and screen actor Alan Bates
- Alan Dawazhouma (alan) — Tibetan–Chinese singer and erhu player Alan Dawazhouma
- Alan Dershowitz: American lawyer, scholar, and public commentator Alan Dershowitz
- Alan Douglas Borges de Carvalho — Brazilian football striker Alan Douglas Borges de Carvalho
- Alan Halsall
- Alan Hodgkin: life and work of a Nobel-winning physiologist Alan Hodgkin
- Alan Kuo — Taiwanese rock singer and actor Alan Kuo
- Alan Moore
- Alan Mulally: Engineer and Executive Who Led Ford's Turnaround Alan Mulally
- Alan Turing: mathematician, pioneer of computing and codebreaking Alan Turing
- Alan Whicker: British journalist and presenter of Whicker’s World Alan Whicker
- Alan Zweibel: American comedy writer and television producer Alan Zweibel
- Alanganallur: Town, traditions and surroundings in Madurai district Alanganallur
- Alanine
- Alanis Morissette: Career, Music, and Cultural Impact Alanis Morissette
- Alappuzha (Alleppey) — coastal city and backwater hub in Kerala, India Alappuzha
- Alaric I — Visigothic leader who sacked Rome (reigned 394–410) Alaric I
- Alaska (U.S. state) Alaska
- Alaska Airlines — US carrier based in Seattle with Pacific Northwest roots Alaska Airlines
- Alaska Interior
- Alaska North Slope
- Alaska Standard Time (AKST) Alaska Standard Time
- Alaskan King Crab Fishing: Overview, Methods, Risks, and Conservation Alaskan king crab fishing
- Alaskan Klee Kai — small northern spitz companion breed Alaskan Klee Kai
- Alaskan Malamute
- Álava (Araba): province in the Basque Country of northern Spain Álava
- Alban Berg: Austrian composer of the Second Viennese School Alban Berg
- Albania — Republic in Southeastern Europe Albania
- Albany International Airport — regional air gateway for New York’s Capital Region Albany International Airport
- Albany, Oregon — Willamette Valley city and county seat Albany, Oregon
- Albatross: oceanic seabirds of the family Diomedeidae Albatross
- Albena Denkova — Bulgarian ice dancer and two-time World champion Albena Denkova
- Albert (given name) Albert
- Albert Camus: life, thought, and literary legacy Albert Camus
- Albert C. Wedemeyer: U.S. Army strategist and commander in China and Asia Albert Coady Wedemeyer
- Albert Coates — Anglo‑Russian conductor and composer Albert Coates
- Albert Einstein: life, contributions, and lasting scientific influence Albert Einstein
- Albert Fert — French physicist and co-discoverer of giant magnetoresistance Albert Fert
- Albert Fish (1870–1936) — American serial killer, child murderer and cannibal Albert Fish
- Albert Gallatin (1761–1849) Albert Gallatin
- Albert Goldfield — 1880s goldfields of northwestern New South Wales Albert Goldfield
- Albert II of Belgium: life, reign and legacy Albert II of Belgium
- Albert Jacka — Australian Victoria Cross recipient (1893–1932) Albert Jacka
- Albert Roussel: French Composer and Neoclassical Voice (1869–1937) Albert Roussel
- Albert Schweitzer: physician, theologian, musician and humanitarian Albert Schweitzer
- Albert, Prince Consort (1819–1861) Albert, Prince Consort
- Albert's lyrebird (Menura alberti): description, behaviour and conservation Albert's lyrebird
- Alberta Williams King
- Alberto Ascari — Italian two-time Formula One World Champion Alberto Ascari
- Alberto Contador — Spanish road racing cyclist and Grand Tour champion Alberto Contador
- Alberto Giacometti: Swiss Sculptor, Painter, and Modernist Innovator Alberto Giacometti
- Saint Alberto Hurtado (Padre Hurtado) Alberto Hurtado
- Alberto Olmedo: influential Argentine comedian and actor Alberto Olmedo
- Albi: Historic Episcopal City and Prefecture in Southern France Albi
- Albinism: causes, characteristics, and impacts in humans, animals, and plants Albinism
- Albiorix — an irregular moon of Saturn Albiorix (moon)
- Albrecht Dürer: German Renaissance Painter, Printmaker, and Theorist Albrecht Dürer
- Albrecht Rodenbach: Flemish poet and symbol of the movement Albrecht Rodenbach
- Albuquerque, New Mexico — overview, history, and culture Albuquerque, New Mexico
- Albuterol (salbutamol): short-acting bronchodilator Albuterol
- Alcántara Bridge (Puente de Alcántara) — Roman arch bridge in Spain Alcántara Bridge
- Alcazaba of Almería
- Alchemy: history, aims, practices, symbolism and legacy Alchemy
- Alcibiades: Athenian statesman, general and controversial figure of the Peloponnesian War Alcibiades
- Alcide De Gasperi: Italy's Postwar Statesman and European Pioneer Alcide De Gasperi
- Alcohol (chemistry): structure, properties, production and uses Alcohol
- Alcohol by Volume (ABV): definition, measurement, and typical ranges Alcohol by volume
- Alcohol withdrawal: causes, symptoms, timeline, and treatment Alcohol withdrawal
- Alcoholic drink
- Alcoholic proof: measuring spirit strength and its systems Alcoholic proof
- Alcoholism (Alcohol Use Disorder): Causes, Symptoms, and Treatment Alcoholism
- Aldebaran — the orange giant star in Taurus Aldebaran
- Aldeburgh Festival: British summer music and arts festival Aldeburgh Festival
- Aldehyde: Structure, Properties, Reactions and Common Uses Aldehyde
- Alderney concentration camps (Nazi occupation of the Channel Islands) Alderney camps
- Aldershot: Hampshire town with a historic military identity Aldershot
- Aldi — German discount supermarket chain Aldi
- Aldol reaction
- Aldous Huxley: Novelist, Essayist, and Social Critic Aldous Huxley