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- OA
- OA&M
- OA&PS
- OA-1
- OA-10
- OA-10A Thunderbolt II
- OA-10 Catalina
- OA-10 Thunderbolt
- OA-10 Thunderbolt II
- OA-12 Duck
- OA-13 Goose
- OA-14 Widgeon
- OA-15
- OA-15 Seabee
- OA-1K
- OA-1K Skyraider II
- OA-37
- OA-37A Dragonfly
- OA-37B Dragonfly
- OA-37 Dragonfly
- OA-3 Dolphin
- OA-4
- OA-4 (disambiguation)
- OA-4 Dolphin
- OA-93
- OA-9 Goose
- OA.4
- OA.Works
- OA1
- OA4
- OA5
- OAA
- OAAA
- OAAA OBIE Awards
- OAAFC
- OAAM
- OAAU
- OAA (band)
- OAA (disambiguation)
- OAB
- OAB-IMG
- OABCIG
- OABCIG Community School District
- OABF
- OABN
- OABR
- OABT
- OAB (disambiguation)
- OAC
- OACA
- OACAC
- OACC
- OACETT
- OACI
- OACIS for the Middle East
- OACL
- OACPS
- OAC (disambiguation)
- OAC - Orfeon Academico de Coimbra
- OAC - Orfeon Académico de Coimbra
- OAC Amtrak
- OAC station
- OAD
- OADC
- OADG
- OADG DOS/V
- OADM
- OADR
- OADS
- OADY
- OADZ
- OAD (Caste)
- OAD (Community)
- OAD (disambiguation)
- OAE
- OAE1b
- OAE2
- OAED Vocational College shooting
- OAEM
- OAEP
- OAE (disambiguation)
- OAF
- OAFA
- OAFC
- OAFL
- OAFL Division 2
- OAFR
- OAFZ
- OAF (disambiguation)
- OAF (station)
- OAG
- OAGA
- OAGZ
- OAG (Air Travel Intelligence)
- OAG (band)
- OAG (company)
- OAG (disambiguation)
- OAG Rail Guide
- OAH
- OAHN
- OAHP
- OAHR
- OAHS
- OAHS (disambiguation)
- OAH (disambiguation)
- OAH Magazine of History
- OAI
- OAI-ORE
- OAI-PMH
- OAIC
- OAIS
- OAIX
- OAI (disambiguation)
- OAIster
- OAJ
- OAJL
- OAJW
- OAJ (disambiguation)
- OAJ Airport
- OAK
- OAKA
- OAKA Basketball Arena
- OAKA Indoor Hall
- OAKA Indoor Sports Arena
- OAKA Olympic Indoor Hall
- OAKA Olympic Sports Hall
- OAKA Sports Hall
- OAKB
- OAKKE
- OAKLAND CENTRAL
- OAKLEY
- OAKLEY (protocol)
- OAKN
- OAKS
- OAKSTAR
- OAK (Russian company)
- OAK (disambiguation)
- OAK Airport
- OAK Bay Airport
- OAK Bay International Airport
- OAK Racing
- OAK Sundar
- OAL
- OALD
- OALM
- OAL (disambiguation)
- OAM
- OAM&P
- OAM's Blues
- OAM-multiplexed
- OAMA
- OAMC
- OAMI
- OAMK
- OAMN
- OAMP
- OAMPT
- OAMS
- OAM (disambiguation)
- OAM multiplexing
- OAN
- OANA
- OAND
- OANL
- OANLT
- OANN
- OANN network
- OAN (disambiguation)
- OAN Encore
- OAN Plus
- OAN de Llano del Hato
- OAO
- OAO-1
- OAO-2
- OAO-2 Stargazer
- OAO-3
- OAO-3 Copernicus
- OAO3
- OAOTDOTM
- OAO "Kompozit"
- OAO "Novosibirskenergo"
- OAO (disambiguation)
- OAO 1657-415
- OAO Aeroflot
- OAO Arcticgas
- OAO Aviakompania Sibir
- OAO Chelyabinsk Forge-and-Press Plant
- OAO Chelyabinsk Forge and Press Plant
- OAO Dolgoprudny
- OAO Elsib
- OAO Energia
- OAO GAZ
- OAO Gazprom
- OAO I.I. Afrikantov OKB Mechanical Engineering
- OAO Kompozit
- OAO Kondopoga
- OAO Lukoil
- OAO Magistralnie Nefteprovodi Druzhba
- OAO Moskovskaya Birzha
- OAO Moskvitch
- OAO Novosibirskenergo
- OAO Rosneft
- OAO Russneft
- OAO S.P. Korolev Rocket and Space Corporation Energia
- OAO S.P. Korolyov Rocket and Space Corporation Energia
- OAO Sedmoi Kontinent
- OAO Severstal
- OAO Sollers
- OAO Svobodny Railroad Car Repair Plant
- OAO TMK
- OAP
- OAPA
- OAPA 1828
- OAPA 1861
- OAPEC
- OAPEN
- OAPEN Foundation
- OAPI
- OAPI (disambiguation)
- OAPI patent
- OAPJ
- OAP (disambiguation)
- OAP Tower
- OAPs
- OAQ
- OAQA
- OAQN
- OAQS
- OAQ (disambiguation)
- OAR
- OARAC
- OARDC
- OARDEC
- OARSI
- OARZ
- OAR (band)
- OAR (disambiguation)
- OAR Ferrol
- OAR under the second presidency of Donald Trump
- OARnet
- OAS
- OAS/UN International Civilian Mission in Haiti
- OAS1
- OAS1 (gene)
- OAS2
- OAS2 (gene)
- OAS3
- OAS3 (gene)
- OASA
- OASA(ALT)
- OASC
- OASC (disambiguation)
- OASD
- OASDI
- OASG
- OASI
- OASIS
- OASIS (Open Artwork System Interchange Standard)
- OASIS (center)
- OASIS (operating system)
- OASIS (organization)
- OASIS (standard)
- OASIS Airlines
- OASIS CAM
- OASIS International
- OASIS International Hospital
- OASIS OpenDocument
- OASIS SOA Reference Model
- OASIS SOA Reference Model (SOA-RM)
- OASIS TOSCA
- OASIS cam
- OASIS model
- OASIS operating system
- OASL
- OASL (gene)
- OASN
- OASPA
- OASTH
- OASYS
- OASYS (disambiguation)
- OAS (disambiguation)
- OAS Charter
- OAS General Assembly
- OAS Secretary-General
- OAS Secretary General
- OAS Secretary General election, 2005
- OAS Special Rapporteur for Freedom of Expression
- OAS building
- OAS headquarters
- OAS invasion of the Dominican Republic
- OAS occupation of the Dominican Republic
- OASys
- OASys (Automotive)
- OASys (company)
- OAT
- OAT1
- OAT2
- OAT3
- OAT4
- OATDOTM
- OATDTM
- OATH
- OATH (Future song)
- OATH (disambiguation)
- OATK
- OATN
- OATOTDOTM
- OATP
- OATP-C
- OATP1A2
- OATP1B1
- OATP1B3
- OATP1C1
- OATP2
- OATP2B1
- OATP3A1
- OATP4A1
- OATP4C1
- OATQ
- OATS
- OATSIH
- OATS (disambiguation)
- OATS Transit
- OATUU
- OATW
- OAT (disambiguation)
- OAT deficiency
- OAT exam
- OAU
- OAUTHC
- OAUZ
- OAU (disambiguation)
- OAU Convention
- OAU Refugee Convention
- OAV
- OAV (anime)
- OAV (disambiguation)
- OAV syndrome
- OAVdA Observatory
- OAVs
- OAW
- OAW (disambiguation)
- OAW C.I
- OAW C.II
- OAX