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Articles beginning with O
- Överkalix Municipality
- Overkill
- Overland Campaign
- Overland Expedition
- Overland Park, Kansas
- Overlord
- Overlord (novel series)
- Overpass
- Overpelt
- Overpopulation means that the population of a place is too high
- Overseas departments of France
- Overseas France the part of France that is outside of the European continent
- Overton County, Tennessee
- Overton's 400
- Övertorneå
- Övertorneå Municipality
- Overture
- Overweight
- Oveta Culp Hobby
- Ovid (village), New York
- Ovidio Messa
- Oviedo
- Oviedo, Florida
- Ovillers-la-Boisselle
- Ovington
- Oviparous animals
- Ovipositor
- Oviraptor
- Oviraptorosaur
- Ovis
- Oviya (TV series)
- Ovo je Balkan
- Ovodda
- Ovule
- Ovum
- Ōwa
- Owain Glyndŵr
- Owari Province
- Owasa, Iowa
- Owasso, Oklahoma
- Owatonna, Minnesota
- Owen Arthur
- Owen Bieber
- Owen Chadwick
- Owen County, Indiana
- Owen County, Kentucky
- Owen Garriott
- Owen Hargreaves
- Owen Hart
- Owen Jones (writer)
- Owen Morris
- Owen Paterson
- Owen Roizman
- Owen Smith
- Owen Sound
- Owen Spencer-Thomas
- Owen Wilson
- Owen Woodhouse
- Owens Lake
- Owensboro, Kentucky
- Owenton, Kentucky
- Owingsville, Kentucky
- Owl
- Owl City
- Owl nebula
- Ownership
- Owsley County, Kentucky
- Owsley Stanley
- Owyhee County, Idaho
- Ox Baker
- Ox Mountain
- Öxabäck
- Öxabäcks IF
- Oxalaia
- Oxalidaceae
- Oxalidales
- Oxberg
- Oxbow lake
- Oxbridge
- Oxegen
- Oxelösund
- Oxelösund Municipality
- Oxfam
- Oxford
- Oxford Circus
- Oxford Circus tube station
- Oxford County, Maine
- Oxford East (UK Parliament constituency)
- Oxford English Dictionary
- Oxford Junction, Iowa
- Oxford Movement
- Oxford Street
- Oxford United F.C.
- Oxford University Press
- Oxford, Alabama
- Oxford, Connecticut
- Oxford, Idaho
- Oxford, Indiana
- Oxford, Iowa
- Oxford, Mississippi
- Oxford, Nova Scotia
- Oxford, Ohio
- Oxfordshire
- Oxfordshire Ironstone Railway
- Oxidation state
- Oxide
- Oxidizing agent
- Oxnard, California
- OXO (video game)
- Oxon Hill, Maryland
- Oxpecker
- Oxycodone
- Oxygen chemical element
- Oxygen (TV channel)
- Oxygen difluoride
- Oxygen saturation
- Oxygen therapy
- Oxygen-18
- Oxymoron
- Oxytocin
- Oy-Mittelberg
- Oya Aydoğan
- Oyanagi Shigeta
- Oye-Plage
- Oyens, Iowa
- Oyo State
- Oyonnax
- Oyster
- Oyster Bay, New York
- Oyster card
- Oystercatcher
- Oz (programming language)
- Oz the Great and Powerful
- Ozai fictional character
- Ozama River
- Ozámiz
- Ozan Tufan
- Ozan, Ain
- Ozark (TV series)
- Ozark County, Missouri
- Ozark, Alabama
- Ozark, Arkansas
- Ozark, Missouri
- Ozarks
- Ozark–St. Francis National Forest
- Ozenx-Montestrucq
- Ozieri
- Ozon, Ardèche
- Ozona, Texas
- Ozone
- Ozone depletion
- Ozone layer
- Ozymandias
- Ozzie Newsome
- Ozzy Osbourne
- Óðr
- Ø
- Øivind Holmsen
- Øyvind Bjorvatn
- Œuf-en-Ternois
- Œuilly, Aisne