- One weekend a month, two weeks a year
- Onega Andozero
- Onega Andozero (air base)
- Onegesius
- Oneida Armory
- Oneida Carry
- Oneonta Armory
- Onesicritus
- Onesilus
- Ong Keo
- Ong Kommandam
- Ong Tze Ch'in
- Ongoing Modern Conflicts in the Philippines
- Oni Gozen
- Onie Wheeler
- Onik Gasparyan
- Oniniwa Tsunamoto
- Oniniwa Yoshinao
- Onision
- Oniwaban
- Oniwaban (spy)
- Oniwabanshū
- Onizuka Air Force Station
- Onkar Singh Kalkat
- Onna-bugeisha
- Onna-musha
- Onnes
- Onnes (general)
- Onni Palaste
- Onno Eichelsheim
- Ono (axe)
- Ono (weapon)
- Ono Michiyoshi
- Ono no Azumabito
- Onodera Shigemichi
- Onodera Yoshimichi
- Onofre Betbeder
- Onomarchus
- Onomaris
- Onomastus of Macedon
- Onontio
- Onorati SMG
- Onoulphus
- Onslow S. Rolfe
- Onstaborg (Sauwerd)
- Onstaborg (Wetsinge)
- Ontario Air National Guard Station
- Ontario Medal for Good Citizenship
- Ontario Medal for Young Volunteers
- Ontario Regiment
- Ontario Regiment Museum
- Ontario Regiment RCAC Regimental Museum
- Ontario Veterans' Memorial
- Ontario Veterans Memorial
- Onufriy Stepanov
- Onversaagd-class minesweeper
- Onyx (interception system)
- Onésime-Joachim Troude
- Ooidonk Castle
- Oorah
- Oorah (Marines)
- Oorlogsvrijwilligers
- Oostkerke Castle
- Oozlefinch
- Opal (armoured personnel carrier)
- Opana Radar Site
- Opel Blitz
- Opelika (YTB-798)
- Open-source intelligence
- Open-source intelligence in the Russian invasion of Ukraine
- Open-source warfare
- OpenROV
- Open Architecture Computing Environment
- Open Source Center
- Open bolt
- Open city
- Open hatch bulk carrier
- Open secret
- Open terrain
- Opening Campaign
- Opequon Confederate order of battle
- Opequon Union Order of Battle
- Opequon Union order of battle
- Opera Nazionale Combattenti
- Operacion Fenix
- Operación 90
- Operación Escorpión
- Operación Hispaniola
- Operación Lince Norte
- Operación Ogro
- Operation
- Operation "Breza '94"
- Operation "Edelweiss"
- Operation "Northern Falcon"
- Operation 1027
- Operation 1107
- Operation 1111
- Operation 2019
- Operation 34A
- Operation 40
- Operation 7
- Operation Ababeel
- Operation Ababil
- Operation Abacus
- Operation Abanadela
- Operation Abercrombie
- Operation Abilene
- Operation Abirey-Halev
- Operation Able Rising Force
- Operation Able Warrior
- Operation Abrasion
- Operation Abstention
- Operation Accius
- Operation Accolade
- Operation Accountability
- Operation Accumulator
- Operation Achilles
- Operation Achse
- Operation Acid Drop
- Operation Acid Gambit
- Operation Acolyte
- Operation Acrobat
- Operation Active Endeavour
- Operation Active Fence
- Operation Adder
- Operation Addition
- Operation Adler
- Operation Adolphe
- Operation Aerial
- Operation Aflame
- Operation Agas
- Operation Agatha
- Operation Agreement
- Operation Aida
- Operation Aider
- Operation Airborne Dragon
- Operation Ajay
- Operation Akron
- Operation Al Majid
- Operation Alacrity
- Operation Alba
- Operation Albatros
- Operation Alberich
- Operation Albion
- Operation Albumen
- Operation Alfa
- Operation Algeciras
- Operation All Clear
- Operation Allen Brook
- Operation Allied Harbor
- Operation Allied Harmony
- Operation Allied Protector
- Operation Allies Refuge
- Operation Alljah
- Operation Almenrausch
- Operation Alpenveilchen
- Operation Alpha
- Operation Alpha (Indonesia)
- Operation Alpha 29
- Operation Alpha Centauri
- Operation Alphabet
- Operation Altair
- Operation Althea
- Operation Alula
- Operation Amanda
- Operation Amarillo
- Operation Ambassador
- Operation Amber Fox
- Operation Amber Star
- Operation Amherst
- Operation An-Far
- Operation Anaconda
- Operation Anaconda (Guyana)
- Operation Anadyr
- Operation Anarchist
- Operation Ancient Babylon
- Operation Anglo
- Operation Animals
- Operation Anklet
- Operation Anthropoid
- Operation Anthropoid Memorial
- Operation Antiquity
- Operation Antler (Porton Down investigation)
- Operation Antyk
- Operation Anvil
- Operation Anvil (Mau Mau Uprising)
- Operation Anvil (Nuclear test)
- Operation Anvil (nuclear test)
- Operation Apache Snow
- Operation Aphrodite
- Operation Apollo
- Operation Appearance
- Operation Apricot
- Operation Aquatint
- Operation Aqueduct
- Operation Arabian Knight
- Operation Arbead II
- Operation Arbor
- Operation Arc Light
- Operation Archer
- Operation Archery
- Operation Archway
- Operation Arctic Fox
- Operation Arctic Sunrise
- Operation Ardennes
- Operation Argon
- Operation Argos
- Operation Argus
- Operation Ariel
- Operation Armour
- Operation Arrow
- Operation Arsenal
- Operation Artemis
- Operation Artemis (disambiguation)
- Operation Asbury Park
- Operation Ashura
- Operation Ashura (Iran)
- Operation Askari
- Operation Assaf
- Operation Assistance
- Operation Assured Delivery
- Operation Assured Response
- Operation Astonia
- Operation Astrakan
- Operation Astute
- Operation Atalanta
- Operation Athena
- Operation Atlante
- Operation Atlantic
- Operation Atlantic Resolve
- Operation Atlas
- Operation Atlas (Mandatory Palestine)
- Operation Atlas Wedge
- Operation Attila
- Operation Attila (World War II)
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