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Articles beginning with O
- Ocheyedan, Iowa
- Ochiltree County, Texas
- Ochlenberg
- Ōchō
- Ochre
- Ochsenfurt
- Ochtrup
- Ocicat
- Ocimum tenuiflorum
- Ockelbo
- Ockelbo Municipality
- Öckerö
- Öckerö Municipality
- OCLC library service and research organization
- Ocoee, Florida
- Oconee County, South Carolina
- Oconomowoc, Wisconsin
- Oconto County, Wisconsin
- Ocourt
- Octacílio Pinheiro Guerra
- Octadecagon
- Octagon
- Octahedron
- Octal
- Octane
- Octane rating
- Octans
- Octave the distance between two musical notes that have the same letter name
- Octave Mirbeau
- Octavia E. Butler
- Octavia Spencer
- Octavio Lepage
- Octavio Paz
- Octene
- Octet
- Octet rule
- Octobass
- October
- October (album)
- October 1
- October 10
- October 11
- October 12
- October 13
- October 14
- October 15
- October 16
- October 17
- October 18
- October 19
- October 2
- October 20
- October 2015 Speaker of the United States House of Representatives election
- October 2018 United States mail bombing attempts
- October 21
- October 22
- October 23
- October 24
- October 25
- October 26
- October 27
- October 28
- October 29
- October 3
- October 30
- October 31
- October 4
- October 5
- October 6
- October 7
- October 8
- October 9
- October Revolution
- Octocorallia
- Octopoda
- Octopodiformes
- Octopus genus of cephalopod mollusc in the order Octopoda
- Octopus card
- Octopus's Garden
- Octopussy
- Oculus
- Oda Nobunaga
- Oda of Canterbury
- Odawa an Indigenous American ethnic group
- Odawara Castle
- Odawara, Kanagawa
- Odd Bondevik
- Odd Future
- Odd Future Records
- Odd Iversen
- Odd number
- Odd-toed ungulate
- Oddar Meanchey province
- Odds
- Ode
- Odebolt, Iowa
- Oded Fehr
- Odell, Illinois
- Oden
- Odense
- Odenwald
- Odenwaldkreis
- Oder
- Oder-Neisse line
- Oder-Spree
- Oderen
- Odesa city in southwestern Ukraine
- Odesa Oblast
- Ödeshög
- Ödeshög Municipality
- Odessa Sathyan
- Odessa, Texas
- Odia Coates
- Odia language
- Odilon Redon
- Odin
- Odinani
- Odisha
- Odo Marquard
- Odo of France
- Odo, Earl of Kent
- Odoacer
- Odometer
- Ödön Földessy
- Odonata
- Odontoceti
- Odontochelys
- Odor
- Odvar Nordli
- Odysseus
- Odyssey
- OECD international organisation of countries
- Oecusse
- Oedema
- Oedipus
- Oegstgeest
- Ōei
- Oekingen
- Oelixdorf
- Oelwein, Iowa
- OEM
- Oeneus
- Oenothera
- Oensingen
- Oerlikon (Zürich)
- Oeschebüttel
- Oeschenbach
- Oeschgen
- Oesling
- Oesophagus
- Oeste Futebol Clube
- Oestradiol
- Oestrogen
- Oestrone
- Oestrous cycle
- Oettingen in Bayern
- Oetwil am See
- Oetwil an der Limmat
- Of
- Of a Revolution
- Of Human Bondage
- Of Love and Other Demons
- Of Love and Shadows
- Of Mice and Men
- Of Plymouth Plantation
- Ofanto
- OFC Nations Cup
- Ofcom
- Ofelya Hambardzumyan
- Off the Wall
- Off-label use
- Off-road vehicle
- Off-site data protection
- Offa of Mercia
- Offa's Dyke
- Offal
- Offekerque
- Offenbach
- Offenbach (district)
- Offenbach am Main
- Offenburg
- Offensive
- Offensive (military)
- Offensive guard
- Offensive linemen
- Offensive tackle
- Offering
- Office
- Office for the Coordination of Humanitarian Affairs
- Office of Management and Budget
- Office of National Drug Control Policy
- Office of Public Works
- Office of Science and Technology Policy
- Office of Strategic Services
- Office of the United States Trade Representative
- Office Space
- Office suite
- Officer
- Officer candidate school
- Officer Creek
- Officer of arms
- Officer railway station
- Official
- Official language
- Official Opposition (Canada)
- Official Opposition (United Kingdom)
- Official Opposition Shadow Cabinet (United Kingdom)
- Official residence
- Official scorer
- Official U.S. PlayStation Magazine
- Offin
- Offrethun
- Offshore investment
- Offside rule
- OFK Beograd
- Öfnerspitze
- Ofra Haza
- Ofrenda
- Ofsted
- Ofterschwang
- Oftringen
- Ōfunato
- Oganesson a synthetic chemical element with symbol Og and atomic number 118
- Ogasawara, Tokyo
- Ogawamachi Station (Tokyo)
- OGC Nice
- Ogden Dunes, Indiana
- Ogden Nash
- Ogden R. Reid
- Ogden, Iowa
- Ogden, Utah
- Ogdensburg, New York
- Ogdoad (Egyptian)
- Ögedei Khan
- Ogemaw County, Michigan
- Ogenne-Camptort
- Ogens
- Ogeu-les-Bains
- Ogg
- Oggy and the Cockroaches
- Oghi
- Oghi Tehsil
- Oghuz District
- Oglala Lakota County, South Dakota
- Ogle County, Illinois
- Oglesby, Illinois
- Ognes, Aisne
- Ogooué-Ivindo Province
- Ogooué-Lolo Province
- Ogooué-Maritime Province
- Ogre
- Ogre, Latvia
- Ogun River
- Ogun State
- Ogyū Sorai Japanese philosopher who used the pen name Butsu Sorai
- Oh Brother, Where Art Thou?
- Oh Se-hoon
- Oh Se-hun singer, rapper, dancer, model and actor
- Oh! Darling
- Oh! Susanna
- Ohangwena Region
- Ohatchee, Alabama
- Ohey
- Ohio
- Ohio County, Indiana
- Ohio County, Kentucky
- Ohio County, West Virginia
- Ohio Is for Lovers
- Ohio Players
- Ohio River
- Ohio Senate
- Ohio State University
- Ohio University
- Ohio Valley Conference an American college sports conference that plays in the NCAA Division I
- Ohio Valley Wrestling
- Ohio Wesleyan University
- Ohio's 2nd congressional district
- Ohio, Illinois
- Ohis
- Ohka
- Ohlone
- Ohm
- Ohm's law
- Ohmstal
- Ōhō
- Ohsweken Demons
- Ohzora
- Oi!
- Oignies
- Oigny-en-Valois
- Oil
- Oil City, Louisiana
- Oil City, Pennsylvania
- Oil field
- Oil lamp
- Oil paint
- Oil platform
- Oil refinery
- Oil refining
- Oil sands