- Aster Revolution
- Asterius (comes Hispanorum)
- Asteropaios
- Astley Cooper Key
- Aston Down
- Aston Webb
- Astor Place Riot
- Astorga, Spain
- Astoria Victory Monument
- Astorre Baglioni
- Astra-Unceta y Cia SA
- Astra (missile)
- Astra .44 MAGNUM CTG.
- Astra 400
- Astra 600
- Astra 680
- Astra A-100
- Astra A-60
- Astra A-70
- Astra A-80
- Astra C
- Astra Model 44
- Astra Model 900
- Astraea-class cruiser
- Astrakhan-Caspian Military Flotilla
- Astrakhan Cossacks
- Astrakhan Kremlin
- Astral crown
- Astravahini-class torpedo recovery vessel
- Astronaut Badge
- Astronaut badge
- Astronautics Corporation of America
- Astros II MLRS
- Asturian miners' strike of 1934
- Asturias Offensive
- Astute-class submarine
- Astyochus
- Astyrius
- Asud
- Asvārān
- Aswaran
- Aswismarmo
- Asymmetric Warfare Group
- Asymmetric warfare
- Asım Gündüz
- At Tiri incident
- At a Calvary near the Ancre
- At aero 088
- At attention
- At the Abyss
- At the Abyss: An Insider's History of the Cold War
- Ata Bey al-Ayyubi
- Atacama border dispute
- Ataga Khan
- Atagi Fuyuyasu
- Atagi Nobuyasu
- Atago-class destroyer
- Atahualpa
- Atakebune
- Atalanta (1883)
- Atalaya Castle (Spain)
- Ataman
- Atami-class gunboat
- Atan Burhagohain
- Atanas (fortress)
- Atanasio Aguirre
- Atanasio Girardot
- Atanda Yusuf
- Atang Senjaya Airport
- Ataollah Salehi
- Atar International Airport
- Atatürk Monument (İzmir)
- Ataullah abu Ammar Jununi
- Atchison Storage Facility
- Atchisson Assault Shotgun
- Ateas
- Ateke Tom
- Ateliers de construction d'Issy-les-Moulineaux
- Ateliers et Chantiers de France
- Ateneo de Manila University ROTC
- Aterui
- Ateyah Al-Shaari
- Atgeir
- Athanaric's Wall
- Athanase-Charles-Marie Charette de la Contrie
- Athanase Louis Marie de Loménie, comte de Brienne
- Athanasios Diakos
- Athanasios Exadaktylos
- Athanasios Frangou
- Athanasios Frontistis
- Athanasios Kanakaris
- Athanasios Miaoulis
- Athanasios N. Miaoulis
- Athanasios Pipis
- Athanasios Tselios
- Athanasios Tzoganis
- Athanasios Veloudios
- Athanasius Treweek
- Athar Abbas
- Athena Promachos
- Athena Technologies
- Athenaeus Mechanicus
- Athenagoras of Macedon
- Athenian Treasury
- Athenian coup of 411 BC
- Athenian military
- Athenian sacred ships
- Athenic-class ocean liner
- Athenion (general)
- Athens Confederate Monument
- Athens Polytechnic uprising
- Athens War Museum
- Athis Airfield
- Athleta Christi
- Athlone Castle
- Athol Alexander Stuart
- Athol Milne
- Athol Richardson
- Athol Townley
- Atholl-class corvette
- Atholl Fleming
- Atholl Highlanders
- Atholl raids
- Athos M. Amorím
- Athronges
- Athula Jayawardane
- Ati Vishisht Seva Medal
- Atif Dudaković
- Atilla (clothing)
- Atilla Altıkat
- Atimonan
- Atimonan, Quezon
- Atiqullah Baryalai
- Atiqullah Raufi
- Atiqur Rahman
- Atiyah Abd al-Rahman
- Atizyes
- Atjeh-class cruiser
- Atka B-24D Liberator
- Atkinson Air Force Base
- Atlacatl Battalion
- Atlangatepec Air Force Station
- Atlanta-class cruiser
- Atlanta Army Airfield
- Atlanta Campaign
- Atlanta Campaign Confederate order of battle
- Atlanta Campaign Confederate order of battle (Second Phase)
- Atlanta Campaign Union order of battle
- Atlanta Confederate order of battle
- Atlanta Cyclorama & Civil War Museum
- Atlanta History Center
- Atlanta Union order of battle
- Atlanta campaign Confederate order of battle
- Atlanta campaign Confederate order of battle, second phase
- Atlanta campaign Union order of battle
- Atlanta campaign Union order of battle, second phase
- Atlanta in the American Civil War
- Atlantic Aircraft
- Atlantic Basin Iron Works
- Atlantic Blockading Squadron
- Atlantic Bridge (flight route)
- Atlantic Charter
- Atlantic City Air National Guard Base
- Atlantic City Armory
- Atlantic City Training Center
- Atlantic Command
- Atlantic Command (Canadian Army)
- Atlantic Council
- Atlantic Fleet
- Atlantic Fleet (United Kingdom)
- Atlantic Revolutions
- Atlantic Star
- Atlantic Storm
- Atlantic Strike
- Atlantic Test Range
- Atlantic Treaty Association
- Atlantic U-boat Campaign (World War I)
- Atlantic U-boat campaign of World War I
- Atlantic Undersea Test and Evaluation Center
- Atlantic Wall
- Atlantic Wall Open Air Museum
- Atlantic Wall open-air museum
- Atlantic campaign of 1806
- Atlantic campaign of May 1794
- Atlantic pockets
- Atlantic raid of June 1796
- Atlantique incident
- Atlantis Submarines
- Atlas Carver
- Atlas Cheetah
- Atlas Commando
- Atlas Oryx
- Atlas V (tugboat)
- Atlas XH-1 Alpha
- Atlas XTP-1 Beta
- Atlas the Barbary lion versus the Bengal tiger of Simla
- Atle-class icebreaker
- Atle Torbjørn Karlsvik
- Atlit naval base
- Atmah (yacht)
- Atmospheric Neutral Density Experiment
- Atnafu Abate
- Atobe Katsusuke
- Atobe Yoshisuke
- Atoc
- Atomic Bomb Casualty Commission
- Atomic Energy Act of 1946
- Atomic Energy Act of 1954
- Atomic Weapons Detection Recognition and Estimation of Yield
- Atomic Weapons Establishment
- Atomic bombings of Hiroshima and Nagasaki
- Atomic demolition munition
- Atomic demolition munitions
- Atomic spies
- Atomic veteran
- Atomska Ratna Komanda
- Atonal II
- Atrocity propaganda
- Ats Bonninga
- Atse Baeda Maryam
- Atsuji Miyahara
- Atta Muhammad Nur
- Attached gas-check
- Attack-class patrol boat
- Attack-class submarine
- Attack Squadron
- Attack Squadron 163 (United States Navy)
- Attack Squadron 174 (United States Navy)
- Attack Squadron 176 (United States Navy)
- Attack Squadron 1L
- Attack Squadron 210 (United States Navy)
- Attack Squadron 42 (United States Navy)
- Attack Squadron 44 (United States Navy)
- Attack Squadron 46 (United States Navy)
- Attack Squadron 75 (United States Navy)
- Attack Squadron 82 (United States Navy)
- Attack Squadron One L
- Attack against Mehmed Ali Pasha
- Attack aircraft
- Attack at Ament's Cabin
- Attack at Fromelles
- Attack at Jeddore
- Attack at Mocodome
- Attack at the Lower Sioux Agency
- Attack dog
- Attack helicopter
- Attack model
- Attack on Abu Bakr Mosque of Baku
- Attack on Altena Farm
- Attack on Anzac Cove
- Attack on Anzac Cove (1915)
- Attack on Aruba
- Attack on Ballygawley barracks
- Attack on Bari Alai
- Attack on Broome
- Attack on Camp Holloway
- Attack on Cawsand
- Attack on Clark Field
- Attack on Cloghoge checkpoint
- Attack on Convoy AN 14
- Attack on Convoy BN 7
- Attack on Derryard checkpoint
- Attack on Fort Paramacay
- Attack on Galle Harbour
- Attack on German Flatts (1757)
- Attack on German Flatts (1778)
- Attack on H3
- Attack on Hrubieszów
- Attack on Kruševac
- Attack on Kure (March 1945)
- Attack on Marstrand
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