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- O
- O'Conor Don
- O. Henry
- O. J. Simpson
- OCLC
- OECD
- OFET
- O (letter)
- O Pioneers!
- Oakland Athletics
- Oasis
- Oath of Maimonides
- Oath of Supremacy
- Obama, Fukui
- Obama administration
- Obamacare
- Oberlin College
- Obersturmbannfuhrer
- Obesity
- Obesity in pets
- Obesogenic environment
- Object-oriented programming
- Oboe
- Obs-Tweedle
- Observable (quantum computation)
- Obsessive-compulsive personality disorder
- Obstetrics
- Obstetrics and gynecology
- Obstructive lung disease
- Obstructive sleep apnea
- Occam's razor
- Occipital scales
- Occitan language
- Occitania
- Occupational therapy
- Occupied Territories
- Occupied Territories/Definition
- Ocean acidification
- Ocean circulation
- Ocean heat content
- Oceania
- Oceanography
- Oceanus
- Ocicat
- Octans
- Octet rule
- October Manifesto
- Octonions
- Ocular scales
- Odambea
- Odds
- Odds ratio
- Odense
- Odin
- Odonata
- Odysseus
- Odyssey
- Oedipus
- Oersted (unit)
- Of Mice and Men
- Office of Management and Budget
- Office of Reconstruction and Humanitarian Assistance
- Official English movement
- Official Opposition (UK)
- Official language
- Ogden Nash
- Oh-Wah-Ree (board game)/Definition
- Ohio-class
- Ohio (U.S. state)
- Ohio River
- Ohio State University
- Ohm
- Ohm's law
- Oita prefecture
- Okayama prefecture
- Okina
- Okinawa Island
- Okinawa Islands
- Okinawa prefecture
- Okinawan Kempo
- Oklahoma (U.S. state)
- Oklahoma City Thunder
- Oklahoma City bombing
- Oktoberfest
- Olanzapine
- Olber's paradox
- Old Bailey
- Old English
- Old High German
- Old Hyde Farm
- Old Montreal
- Old Norse
- Old Saxon
- Old Testament
- Old Trafford Cricket Ground
- Old earth creationism
- Olduvai Gorge
- Olfactory bulb
- Olga Lengyel
- Oligarchy
- Olive Dame Campbell
- Oliver Cromwell
- Oliver Hazard Perry-class
- Oliver Henry (USCG)
- Oliver North
- Olivia de Berardinis
- Olivia de Havilland
- Olympias
- Olympic Games
- Om Jayanti Maṅgalā Kālī
- Omaha Beach
- Omaha poker
- Oman
- Omar Bradley
- Omar Khayyam
- Omega
- OmegaT+
- Omega (Greek letter)
- Omeprazole
- Omicron (Greek letter)
- Omnibus (Marvel Comics)
- Omnipotence paradox
- Omniscience
- On Stage (Elvis Presley album)
- On the Concept of Irony with Continual Reference to Socrates
- Once an Eagle
- Oncology
- One-state solution
- One-time pad
- One-time pad/Permission
- One-way encryption
- One and Other
- Online Mendelian Inheritance in Man
- Online collaboration
- Online community
- Online dating
- Online document services
- Online encyclopedia
- Online matrimonials
- Onslow Beach
- Onslow Beach/Definition
- Onslow Beach/Gallery
- Onslow County, North Carolina
- Ontario
- Ontario Island
- Ontario Line
- Ontological argument for the existence of God
- Ontological argument for the existence of God/Other article
- Ontological commitment
- Ontological pluralism
- Ontology (philosophy)
- Open-access journal
- OpenLeaks
- OpenStreetMap
- Open Access Scholarly Publishers Association
- Open Door policy
- Open Handset Alliance
- Open Knowledge Conference
- Open PGP
- Open Shortest Path First
- Open Shortest Path First for IPv6
- Open Shortest Path First traffic engineering extensions
- Open Systems Interconnection Reference Model
- Open access
- Open cluster
- Open data
- Open license
- Open loop control
- Open map
- Open notebook science
- Open science
- Open set
- Open source software
- Opening theory (chess)
- Operating system
- Operating system/Catalogs
- Operation (mathematics)
- Operation Aiga
- Operation Barbarossa
- Operation CARTWHEEL
- Operation CEDAR FALLS
- Operation Downfall
- Operation Eagle Claw
- Operation FLAMING DART
- Operation FREQUENT WIND
- Operation Gamble
- Operation Iraqi Freedom
- Operation JUNCTION CITY
- Operation KETSU-GO
- Operation Market Garden
- Operation Nanook (1946)
- Operation Nanook (2007)
- Operation Nanook (2008)
- Operation Nanook (2009)
- Operation Nanook (2010)
- Operation Overlord
- Operation POPEYE
- Operation Rankin
- Operation Rolling Thunder
- Operation Sea Lion
- Operation Starlight
- Operation Starvation
- Operation Sunrise
- Operation Torch
- Operation Vittles
- Operational amplifier
- Operations research
- Operations security
- Opeth
- Ophiuchus
- Ophthalmoscope
- Opiate dependence
- Opihi
- Opioid analgesic
- Opioid receptor
- Opium
- Opportunistic encryption
- Opportunity cost
- Opsonins
- Optic chiasm
- Optic tectum
- Optical Disc
- Optimization (computer science)
- Optimization (disambiguation)
- Optimization (mathematics)
- Optimization (mathematics)/Catalogs
- Option
- Oracle (computer software)
- Oral History
- Orange (fruit)
- Orange Order
- Orange Revolution
- Orbit
- Orbital-angular momentum
- Orbital hybridisation
- Orbitofrontal Cortex
- Orch-OR
- Orchestra
- Orchestra/Catalogs/Youth orchestras in the United States
- Orchestral music
- Orchid/Draft
- Order (group theory)
- Order (relation)
- Order (ring theory)
- Order parameter
- Ordered field
- Ordered pair
- Ordered structure
- Ordesa and Monte Perdido National Park
- Oregon (U.S. state)
- Orestes
- Organ theory of government
- Organelle
- Organic chemistry
- Organic nitrate explosives
- Organic reaction
- Organic reaction/Catalogs
- Organism
- Organization of the Islamic Conference
- Organizer (cell)
- Organizer (cell)/Archive 1
- Organosilicon
- Orgone therapy
- Oriental (word)
- Oriental (word)/Archive 1
- Orientalism
- Origin of life
- Origin of music
- Origins and architecture of the Taj Mahal
- Origins of Totalitarianism
- Origins of carpets
- Origins of cricket
- Oriolus isabellae (Isabela Oriole)
- Orion
- Orion (1904 ship)
- Orion Nebula
- Orkut
- Orlando, Florida
- Orlando Magic
- Orléans Cathedral
- Oro Bay
- Orphan Black
- Orphan Black: Echoes
- Orphan works
- Orpiment
- Orthodox Christianity
- Orthodox Judaism
- Orthogonal array
- Orthography
- Orthography of Irish
- Orthomyxoviridae
- Orthostatic hypotension
- Oruzgan police station attack of January 2002
- Orval Faubus
- Orville Gibson
- Osaka (city)
- Osaka prefecture
- Osama bin Laden
- Oscar Wilde
- Oscillococcinum
- Oseltamivir
- Oslo
- Oslo Report
- Osmium
- Osprey-class
- Osso buco
- Osso buco/Definition
- Ostend Manifesto