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- Arizona Diamondbacks
- Arizona State University (ASU) Arizona State University
- Arizona Territory (United States, 1863–1912) Arizona Territory
- Arizona's 1st congressional district
- Arizona's 2nd congressional district
- Arizona's 3rd congressional district
- Arjan Singh — Marshal of the Indian Air Force (1919–2017) Arjan Singh
- Årjäng — town in Värmland County, Sweden Årjäng
- Årjäng Municipality — overview, geography, history and local life Årjäng Municipality
- Arjen Anthony Lucassen
- Arjen Robben — Dutch left-footed winger and influential footballer Arjen Robben
- Arjeplog — town in Swedish Lapland and seat of Arjeplog Municipality Arjeplog
- Arjeplog Municipality
- Arjit Taneja — Indian television actor and model Arjit Taneja
- Arjun Bijlani — Indian television actor Arjun Bijlani
- Arjuna: Principal Hero of the Mahabharata and Central Figure in the Bhagavad Gita Arjuna
- Arjuna Award
- Ark of the Covenant: origin, description, traditions, and legacy Ark of the Covenant
- Ark-La-Tex: Four-State Region at the Arkansas–Louisiana–Texas–Oklahoma Junction Ark-La-Tex
- Arka Sokaklar — Turkish police procedural television series Arka Sokaklar
- Arkadelphia, Arkansas — overview and history Arkadelphia, Arkansas
- Arkadi Ghukasyan — President of the Nagorno-Karabakh Republic (1997–2007) Arkadi Ghukasyan
- Arkadiusz Milik — Polish professional footballer Arkadiusz Milik
- Arkady Arkanov
- Arkady Babchenko: Russian war correspondent and controversial target Arkady Babchenko
- Arkalochori Axe: the inscribed Minoan double axe (labrys) Arkalochori Axe
- Arkangel de la Muerte — Mexican luchador, champion, and trainer Arkangel de la Muerte
- Arkansas (U.S. state) Arkansas
- Arkansas City, Arkansas — Delta town in Desha County Arkansas City, Arkansas
- Arkansas City, Kansas — riverfront community in southern Kansas Arkansas City, Kansas
- Arkansas County, Arkansas: overview, history, geography and economy Arkansas County, Arkansas
- Arkansas Razorbacks — University of Arkansas athletic teams Arkansas Razorbacks
- Arkansas River
- Arkansas State University (Jonesboro) — public research university in Northeast Arkansas Arkansas State University
- Arke (Greek mythology) Arke (mythology)
- Arkesden, Essex: village and civil parish in Uttlesford, England Arkesden
- Arkham Asylum (Gotham City psychiatric hospital) Arkham Asylum
- Arkoma, Oklahoma
- Arkose: A Feldspar-rich Sandstone — Composition, Formation, and Significance Arkose
- Arlebosc — commune in Ardèche, France Arlebosc
- Arlen Specter: U.S. Senator from Pennsylvania Arlen Specter
- Arlene Dahl
- Arlene Foster
- Arlene Francis (1907–2001) — American actress and broadcaster Arlene Francis
- Arlene Golonka — American character actress known for television roles (1936–2021) Arlene Golonka
- Arlene Martel — American character actress and acting coach Arlene Martel
- Arlene McQuade — American actress (1936–2014) Arlene McQuade
- Arles: Roman heritage, Provençal culture, and the Camargue plains Arles
- Arlesey: a small town and civil parish in Bedfordshire, England Arlesey
- Arlesheim: Swiss municipality and district capital in Basel-Landschaft Arlesheim
- Arlesheim District, Basel-Landschaft, Switzerland Arlesheim District
- Arleta, Los Angeles
- Arlette Zola: Swiss singer and Eurovision representative Arlette Zola
- Arletty: French actress, singer and iconic screen personality Arletty
- Arleux-en-Gohelle: commune in Pas-de-Calais, northern France Arleux-en-Gohelle
- Arley, Alabama: Overview of a Small Southern Town Arley, Alabama
- Arlington
- Arlington County, Virginia
- Arlington Heights, Illinois
- Arlington Memorial Amphitheater
- Arlington National Cemetery — history, monuments, and national significance Arlington National Cemetery
- Arlington, Illinois
- Arlington, Iowa: small city in northeastern Iowa Arlington, Iowa
- Arlington, Kansas
- Arlington, Kentucky
- Arlington, Massachusetts: Overview, history, and notable features Arlington, Massachusetts
- Arlington, New York
- Arlington, Oregon
- Arlington, Texas — city profile, history, attractions and institutions Arlington, Texas
- Arlington, Washington: overview, history, geography, and community Arlington, Washington
- Arlington, Wisconsin (village) Arlington, Wisconsin
- Arlo Guthrie: American folk singer, storyteller, and songwriter Arlo Guthrie
- Arlon — Capital of the Belgian Province of Luxembourg Arlon
- Arlöv, Burlöv Municipality (Skåne, Sweden) Arlöv
- Arm (anatomy and function) Arm
- ARM architecture: a low-power RISC CPU family for mobile, embedded, and beyond ARM architecture
- Arm wrestling: sport, techniques, history, and safety Arm wrestling
- Arma Angelus — Chicago metalcore band (1998–2002) Arma Angelus
- Arma-Goddamn-Motherfuckin-Geddon (Marilyn Manson song) Arma-Goddamn-Motherfuckin-Geddon
- Arma, Kansas
- Armadale railway line (Perth metropolitan rail) Armadale railway line
- Armadillo: overview, anatomy, behavior, and conservation Armadillo
- Armageddon: meaning, origins, and cultural significance Armageddon
- Armageddon (1999) — the first WWF Armageddon pay-per-view Armageddon (1999)
- Armageddon (2000) — WWF pay-per-view in Birmingham, Alabama Armageddon (2000)
- Armageddon (2002) — WWE pay-per-view event Armageddon (2002)
- Armageddon (2003) — WWE Raw brand pay-per-view Armageddon (2003)
- Armageddon (2004) — WWE SmackDown! pay-per-view in Duluth, Georgia Armageddon (2004)
- Armageddon (2005) — WWE SmackDown Pay‑Per‑View Armageddon (2005)
- Armageddon (2006) — WWE SmackDown! pay-per-view in Richmond Armageddon (2006)
- Armageddon (2008) — WWE December pay-per-view Armageddon (2008)
- Armagh: city, county town, and ecclesiastical centre in Northern Ireland Armagh
- Armagnac (brandy): History, production, varieties and uses Armagnac (brandy)
- Arman Kirakossian
- Armançon — river in Burgundy, France Armançon
- Armancourt (Somme) — commune in Hauts-de-France Armancourt, Somme
- Armand (Herman van Loenhout) — Dutch protest singer Armand (singer)
- Armand David — French Lazarist missionary and naturalist Armand David
- Armand De Decker (1948–2019) Armand De Decker
- Armand de Las Cuevas
- Armand Gatti: Playwright, Filmmaker and Resistance Figure Armand Gatti
- Armand Traoré
- Armando (1929–2018) — Dutch painter, sculptor and writer Armando (artist)
- Armando Calderón Sol (1948–2017), President of El Salvador Armando Calderón Sol
- Armando Cossutta (1926–2015) Armando Cossutta
- Armando "Armandinho" dos Santos (1911–1972), Brazilian footballer Armando dos Santos
- Armando Francioli (1919–2020) Armando Francioli
- Armando Guebuza (President of Mozambique, 2005–2015) Armando Guebuza
- Armando Hart — Cuban revolutionary, Minister of Education and Culture Armando Hart
- Armando Merodio (1935–2018) Armando Merodio
- Armando Nieto Vélez — Peruvian Jesuit Priest and Historian Armando Nieto
- Armando Peraza — Cuban-American Latin Jazz Percussionist Armando Peraza
- Armando Uribe: Chilean poet, lawyer, diplomat and essayist Armando Uribe
- Armando Villanueva del Campo: Peruvian APRA Leader and Statesman Armando Villanueva
- Armani
- Armardeh (Armerde) — city in Iran's Kurdistan province Armardeh
- Armavir Province: geography, history, and cultural significance Armavir Province
- Armavir, Armenia — history, archaeology, and regional significance Armavir, Armenia
- Armeau (Yonne) — commune in Bourgogne‑Franche‑Comté, France Armeau
- Armed and Dangerous (1986 film) Armed and Dangerous (1986 movie)
- Armed Forces DNA Identification Laboratory (AFDIL) Armed Forces DNA Identification Laboratory
- Armed Forces of the Republic of Armenia Armed Forces of Armenia
- Armed Forces of Belarus
- Armed Forces of the Russian Federation
- Armed Islamic Group (GIA) — Algerian Islamist insurgent organization Armed Islamic Group
- Armen Grigoryan — frontman and songwriter of Krematorij Armen Grigoryan
- Armen Movsisyan — Armenian Minister of Energy and Natural Resources (1962–2015) Armen Movsisyan
- Armen Sarkissian
- Armendarits — commune in the Pyrénées-Atlantiques, France Armendarits
- Armenia: Geography, History, Culture, and Contemporary Overview Armenia
- Armenia at the 2018 Winter Paralympics
- Armenia at the Olympics
- Armenia at the Eurovision Song Contest 2016 Armenia in the Eurovision Song Contest 2016
- Armenia national football team
- Armenia, Colombia
- Armenia, Wisconsin (town in Juneau County) Armenia, Wisconsin
- Armenian
- Armenian Air Force
- Armenian alphabet
- Armenian Americans: History, communities, and cultural life Armenian Americans
- Armenian Apostolic Church: history, beliefs, structure, and cultural role Armenian Apostolic Church
- Armenian Army
- Armenian calendar (medieval 365‑day civil calendar) Armenian calendar
- Armenian Catholic Church
- Armenian diaspora: distribution, history, and cultural identity Armenian diaspora
- Armenian dram
- Armenian Evangelical Church: history, beliefs, and global presence Armenian Evangelical Church
- Armenian genocide
- Armenian Highlands: geography, geology, history and cultural significance Armenian highlands
- Armenian hypothesis (Proto-Indo-European homeland) Armenian hypothesis
- Armenian illuminated manuscripts: history, style, and notable works Armenian illuminated manuscripts
- Armenian Kingdom of Cilicia
- Armenian language: history, features, and modern varieties Armenian language
- Armenian Legion (World War II) Armenian Legion
- Armenian Premier League
- Armenian Quarter (Old City of Jerusalem) Armenian Quarter
- Armenian Revolutionary Federation (Dashnaktsutyun) Armenian Revolutionary Federation
- Armenian rock
- Armenian Secret Army for the Liberation of Armenia (ASALA) Armenian Secret Army for the Liberation of Armenia
- Armenian Soviet Socialist Republic (1920–1991) Armenian Soviet Socialist Republic
- Armenian Wikipedia
- Armenians ethnic group native to the Armenian Highlands of Western Asia
- Armenians in the Ottoman Empire
- Armens: ancient tribal groups of the Armenian Highlands Armens
- Armentières-sur-Ourcq
- Armi Kuusela: Finland's First Miss Universe (1952) Armi Kuusela
- Armidale, New South Wales Armidale
- Armie Hammer
- Armiger (person entitled to a coat of arms) Armiger
- Armillaria gallica — a temperate honey mushroom species Armillaria gallica
- Armin Laschet — German politician and former CDU leader Armin Laschet
- Armin Meiwes — German case of consensual homicide and cannibalism Armin Meiwes
- Armin Mueller‑Stahl Armin Mueller-Stahl
- Armin T. Wegner: Writer, Witness and Human Rights Advocate Armin T. Wegner
- Armin van Buuren — Dutch DJ and trance producer Armin van Buuren
- Armington, Illinois: Village in Tazewell County within the Peoria Metropolitan Area Armington, Illinois
- Arminia Bielefeld — German sports club from Bielefeld, North Rhine-Westphalia Arminia Bielefeld
- Arminianism
- Arminius (Hermann): Cherusci leader and victor at Teutoburg Arminius
- Arminsyah — Indonesian Vice Attorney General (1960–2020) Arminsyah
- Armissan — commune in Aude, Occitanie, France Armissan
- Armistead, Red River Parish, Louisiana Armistead, Louisiana
- Armistice: definition, origins, legal status, negotiation and examples Armistice
- Armistice of 11 November 1918 armistice treaty between the Allies
- Armistice and Preliminaries of Villafranca (11 July 1859) Armistice of Villafranca
- Armitage Shanks — British sanitaryware manufacturer Armitage Shanks
- Armix — a small rural commune in Ain, Auvergne-Rhône-Alpes Armix
- Armonk, New York: Overview of the hamlet and community in Westchester County Armonk, New York
- Armor for Sleep (American alternative rock band) Armor for Sleep
- Armorer: duties, skills, history and distinctions Armorer
- Armorial of the Districts of Rhineland-Palatinate Armorial of districts in Rhineland-Palatinate
- Armorica (Aremorica): the ancient coastal region of northwestern Gaul Armorica
- Armour: history, types, materials and modern applications Armour
- Armour of God (1986 film) — Jackie Chan action-adventure comedy Armour of God
- Armour Square, Chicago: South Side community area and neighborhood Armour Square, Chicago
- Arms trafficking (gun‑running): causes, methods and international responses Arms trafficking
- Armstrong County, Pennsylvania
- Armstrong County, Texas — overview, geography, history and local life Armstrong County, Texas
- Armstrong, Iowa — Small city in Emmet County Armstrong, Iowa
- Armstrong, Oklahoma — small town profile Armstrong, Oklahoma
- Armstrong's mixture
- Armungia, Sardinia: small comune in Sud Sardegna Armungia
- Army: organization, roles, history and modern characteristics Army
- Army ant (legionary ant) Army ant
- Army of Mississippi (Confederate) Army of Mississippi
- Army of Northern Virginia
- Army of Shadows (L'Armée des ombres) — Jean‑Pierre Melville’s wartime drama Army of Shadows
- Army of Tennessee (Confederate) Army of Tennessee
- Army of the Cumberland
- Army of the Mississippi (Union armies) Army of the Mississippi
- Army of the Pharaohs (hip hop collective) Army of the Pharaohs
- Army of the Potomac: principal Union army in the Eastern Theater Army of the Potomac
- Army of the Tennessee — Union field army in the Western Theater Army of the Tennessee
- Army ranks and insignia of the Russian Federation
- Arn Anderson
- Arnage, Sarthe — commune near Le Mans in Pays de la Loire Arnage, Sarthe
- Arnaldo Forlani: Italian Christian Democrat and Prime Minister (1980–1981) Arnaldo Forlani
- Arnaud Beltrame: French Gendarme Who Gave His Life in the 2018 Trèbes Attack Arnaud Beltrame
- Arnaut Danièl — Occitan troubadour and innovator in medieval lyric poetry Arnaut Danièl
- Arne Carlson: Minnesota Governor and Moderate Republican Arne Carlson
- Arne Duncan: U.S. Education Administrator and Former Secretary of Education Arne Duncan
- Arne Friedrich
- Arne Lyngstad (1962–2019) — Norwegian politician Arne Lyngstad
- Arne Nilsen — Norwegian Labour politician and parliamentary leader (1924–2020) Arne Nilsen
- Arne Solli — Norwegian general and Chief of Defence (1938–2017) Arne Solli
- Arne Weise — Swedish broadcaster and television personality Arne Weise
- Arnéguy — small commune in the French Basque country Arnéguy
- Arnett E. Girardeau: Florida Dentist, Civil Rights Advocate and Legislator Arnett E. Girardeau
- Arnett, Oklahoma
- Arnex-sur-Nyon — municipality in Vaud, Switzerland Arnex-sur-Nyon
- Arnex-sur-Orbe: Swiss municipality in the canton of Vaud Arnex-sur-Orbe
- Arnhem — capital of Gelderland and city in the eastern Netherlands Arnhem
- Arnhem Land: geography, culture, and history of Australia's northern region Arnhem Land
- Arni: name, places, and meanings Arni
- Arni (Aargau) — municipality in the Bremgarten district Arni, Aargau
- Arni (Bern) — municipality in the canton of Bern, Switzerland Arni, Bern
- Arnie Brown (Stewart Arnold Brown) — Canadian professional ice hockey defenceman Arnie Brown
- Arnie Lerma: Internet Activist and Critic of Scientology Arnie Lerma
- Arno (river in Tuscany, Italy) Arno
- Arno Schmidt: German experimental writer and translator Arno Schmidt
- Arnold Bennett
- Arnold Chan: Canadian lawyer and Member of Parliament for Scarborough—Agincourt Arnold Chan
- Arnold Clark: Scottish car dealer and founder of Arnold Clark Group Arnold Clark
- Arnold Flass
- Arnold Heertje — Dutch economist and public intellectual Arnold Heertje
- Arnold Henry Guyot
- Arnold Klein (American dermatologist, 1945–2015) Arnold Klein
- Arnold Koller — Swiss Federal Councillor and public servant Arnold Koller
- Arnold Kopelson — American film producer Arnold Kopelson
- Arnold Palmer: Life, Career, and Legacy of a Golfing Icon Arnold Palmer
- Arnold Peralta
- Arnold R. Hirsch
- Arnold Ridley
- Arnold Rikli: 19th‑Century Natural Healer and Early Advocate of Sun and Air Therapy Arnold Rikli
- Arnold Rosé — Violinist and Longtime Concertmaster of the Vienna Philharmonic Arnold Rosé
- Arnold Rüütel: Estonian statesman who bridged Soviet and independent eras Arnold Rüütel
- Arnold Schoenberg
- Arnold Schwarzenegger: Bodybuilder, Actor, and Governor Arnold Schwarzenegger
- Arnold Skaaland
- Arnold Cantwell Smith — Canadian diplomat and first Commonwealth Secretary‑General Arnold Smith
- Arnold Sommerfeld: German theoretical physicist and influential teacher Arnold Sommerfeld
- Arnold Spielberg
- Arnold Wesker: British playwright known for social realism Arnold Wesker
- Arnold, Pennsylvania
- Arnoldo Foà — Italian actor and voice artist Arnoldo Foà
- Arnolds Park, Iowa
- Arnór Ingvi Traustason — Icelandic midfielder and Euro 2016 goalscorer Arnór Ingvi Traustason
- Arnos (Pyrénées-Atlantiques) — commune in southwestern France Arnos
- Arnos Grove tube station
- Arnprior, Stirling, Scotland Arnprior, Stirling
- Arnsberg — town in the Sauerland, North Rhine-Westphalia Arnsberg
- Arnsberg Government Region (Regierungsbezirk Arnsberg) Arnsberg Government Region
- Arnulf Baring
- Arnulf I, Count of Flanders (Arnulf the Great) Arnulf I, Count of Flanders
- Arnulf II of Flanders (c. 961–987) Arnulf II, Count of Flanders
- Arnulf Kolstad — Norwegian Social Psychologist and Academic (1942–2020) Arnulf Kolstad
- Arogno — municipality in the Lugano district of Ticino, Switzerland Arogno
- Aroma Park, Illinois — village overview and local profile Aroma Park, Illinois
- Aromanian language (Macedo‑Romanian or Vlach) Aromanian language
- Aromatherapy
- Aromatic hydrocarbon (arene) Aromatic hydrocarbon
- Aromobatidae: neotropical frogs related to poison-dart frogs Aromobatidae
- Aron Eisenberg — actor best known for Nog on Star Trek: Deep Space Nine Aron Eisenberg
- Aron Nimzowitsch — Hypermodern Theorist, Player and Author Aron Nimzowitsch
- Aron Ralston: climber, engineer, and survivor of the Blue John Canyon ordeal Aron Ralston
- Aron Winter
- Aron (Mayenne) — commune in Pays de la Loire, France Aron, Mayenne
- Aroostook County, Maine
- Arosa: Swiss Alpine town and resort in Graubünden Arosa
- Arosio, Ticino — village and former municipality in Alto Malcantone, Switzerland Arosio, Switzerland
- Aroue-Ithorots-Olhaïby: a rural commune in the French Basque Country Aroue-Ithorots-Olhaïby
- Around the World in 80 Days (1956 film) Around the World in 80 Days (1956 movie)
- Around the World in Eighty Days
- Arovell Verlag — Austrian independent publisher of contemporary German-language literature Arovell Verlag
- Arp Schnitger — Northern European Baroque Organ Builder Arp Schnitger
- Árpád Göncz: writer, dissident and Hungary’s first post‑communist president Árpád Göncz
- ARPANET: the pioneering packet‑switched research network ARPANET
- Arpeggio (musical technique) Arpeggio
- Arpheuilles-Saint-Priest — commune in Allier, central France Arpheuilles-Saint-Priest
- Arpin, Wisconsin