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- Oceanic trench Oceanic trench
- Ocelot Ocelot
- Octal Octal
- Octave Octave
- Octocorallia Octocorallia
- Octopus Octopus
- Odawa Odawa
- Odenwald Odenwald
- Oder River Oder River
- Odessa Odessa
- Odilon Redon Odilon Redon
- Odin Odin
- Odontoceti Odontoceti
- Odontochelys Odontochelys
- Odyssey Odyssey
- OECD OECD
- Oestradiol Oestradiol
- Of Mice and Men Of Mice and Men
- Ofanto Ofanto
- Off-site data protection Off-site data protection
- Offa's Dyke Offa's Dyke
- Official residence Official residence
- Official U.S. PlayStation Magazine Official U.S. PlayStation Magazine
- Offside rule Offside rule
- Ofra Haza Ofra Haza
- Oganesson Oganesson
- Ogdoad (Egyptian) Ogdoad (Egyptian)
- OGPU OGPU
- Ogyū Sorai Ogyū Sorai
- Oh Se-hun Oh Se-hun
- Ohio Senate Ohio Senate
- Ohio Valley Conference Ohio Valley Conference
- Ohm's law Ohm's law
- Oil Oil
- Oil sands Oil sands
- Ojibwe Ojibwe
- Okefenokee Swamp Okefenokee Swamp
- Okinawa Okinawa
- Oklahoma Oklahoma
- Okroshka Okroshka
- Oksana Baiul Oksana Baiul
- Ólafur Ragnar Grímsson Ólafur Ragnar Grímsson
- Old Kingdom of Egypt Old Kingdom of Egypt
- Old Melbourne Gaol Old Melbourne Gaol
- Old North Church Old North Church
- Old Style and New Style dates Old Style and New Style dates
- Old Testament Old Testament
- Old-growth forest Old-growth forest
- Oldest dated rocks Oldest dated rocks
- Oldham Oldham
- Olduvai Gorge Olduvai Gorge
- Olea capensis Olea capensis
- Olfaction Olfaction
- Olfactory system Olfactory system
- Olive (color) Olive (color)
- Oliver & Company Oliver & Company
- Oliver Cromwell Oliver Cromwell
- Oliver Goldsmith Oliver Goldsmith
- Oliver Heaviside Oliver Heaviside
- Oliver Smithies Oliver Smithies
- Olivia Colman Olivia Colman
- Olly Murs Olly Murs
- Olof Palme Olof Palme
- Olympic Games Olympic Games
- Om Puri Om Puri
- Omagh Omagh
- Omega Centauri Omega Centauri
- Omnivore Omnivore
- On the Floor On the Floor
- Once Upon a Time in Mexico Once Upon a Time in Mexico
- Oncogene Oncogene
- One Direction One Direction
- One Hot Minute One Hot Minute
- One-inch boy One-inch boy
- One-party state One-party state
- Oneworld Oneworld
- Online Computer Library Center Online Computer Library Center
- Online shopping Online shopping
- Oobi Oobi
- Oodgeroo Noonuccal Oodgeroo Noonuccal
- Oomycete Oomycete
- Oort cloud Oort cloud
- Op art Op art
- Opcode Opcode
- OPEC OPEC
- Opel Opel
- Open class Open class
- Open content Open content
- Open Season (movie) Open Season (movie)
- Open Season 2 Open Season 2
- Open Season 3 Open Season 3
- Open star cluster Open star cluster
- Open University Open University
- Openair Frauenfeld Openair Frauenfeld
- OpenBSD OpenBSD
- OpenOffice OpenOffice
- OpenOffice Base OpenOffice Base
- OpenOffice Calc OpenOffice Calc
- OpenOffice Draw OpenOffice Draw
- OpenOffice Impress OpenOffice Impress
- OpenVMS OpenVMS
- OpenVPN OpenVPN
- Opera buffa Opera buffa
- Opera house Opera house
- Opera seria Opera seria
- Opéra-Comique Opéra-Comique
- Operant conditioning Operant conditioning
- Operating system Operating system
- Operation Barbarossa Operation Barbarossa
- Operation Entebbe Operation Entebbe
- Operation Overlord Operation Overlord
- Operation Restore Hope Operation Restore Hope
- Operations and Checkout Building Operations and Checkout Building
- Operetta Operetta
- Opeth Opeth
- Ophthalmosauridae Ophthalmosauridae
- Ophthalmosaurus Ophthalmosaurus
- Opiliones Opiliones
- Opioid Opioid
- Opium poppy Opium poppy
- Oppidum Oppidum
- Opsin Opsin
- Optical fiber Optical fiber
- Optical illusion Optical illusion
- Optical printer Optical printer
- Opus Dei Opus Dei
- Opus number Opus number
- Oracle Corporation Oracle Corporation
- Oradea Oradea
- Oral rehydration therapy Oral rehydration therapy
- Orange (fruit) Orange (fruit)
- Orange County, California Orange County, California
- Orange Is the New Black Orange Is the New Black
- Orange Walk District Orange Walk District
- Orator Orator
- Oratorio Oratorio
- Orbit Orbit
- Orbital resonance Orbital resonance
- Orchestration Orchestration
- Orchid Orchid
- Order of magnitude Order of magnitude
- Order of Merit Order of Merit
- Order of operations Order of operations
- Order of St Michael and St George Order of St Michael and St George
- Order of the Companions of Honour Order of the Companions of Honour
- Order of the Indian Empire Order of the Indian Empire
- Order of the Phoenix Order of the Phoenix
- Order of the Star of India Order of the Star of India
- Order of the Thistle Order of the Thistle
- Ordnance Survey National Grid Ordnance Survey National Grid
- Ordo Templi Orientis Ordo Templi Orientis
- Ordovician Ordovician
- Ore Mountains Ore Mountains
- Oregon Territory Oregon Territory
- Oregon Trail Oregon Trail
- Organelle Organelle
- Organic chemistry Organic chemistry
- Organic light-emitting diode Organic light-emitting diode
- Organic matter Organic matter
- Organisation internationale de la Francophonie Organisation internationale de la Francophonie
- Organism Organism
- Orgasm Orgasm
- Orhan Pamuk Orhan Pamuk
- Oriana Fallaci Oriana Fallaci
- Origami Origami
- Origen Origen
- Origin of birds Origin of birds
- Origin of life Origin of life
- Origins of the blues Origins of the blues
- Orinoco Orinoco
- Oriole Oriole
- Orion (constellation) Orion (constellation)
- Orion Arm Orion Arm
- Orion complex Orion complex
- Orkney Islands Orkney Islands
- Orlando Bloom Orlando Bloom
- Orlando Brown Orlando Brown
- Ornamentation (music) Ornamentation (music)
- Orne Orne
- Ornithischia Ornithischia
- Ornithomimidae Ornithomimidae
- Ornithomimus Ornithomimus
- Ornithopod Ornithopod
- Orogeny Orogeny
- Orquesta Sinfónica Simón Bolívar Orquesta Sinfónica Simón Bolívar
- Orrin Hatch Orrin Hatch
- Orson Scott Card Orson Scott Card
- Orthodox Orthodox
- Orthographic depth Orthographic depth
- Orthomyxoviridae Orthomyxoviridae
- Orthosie (moon) Orthosie (moon)
- Orto botanico di Pisa Orto botanico di Pisa
- OS X El Capitan OS X El Capitan
- Osage County, Kansas Osage County, Kansas
- Osage Nation Osage Nation
- Osaka Castle Osaka Castle
- Osama bin Laden Osama bin Laden
- Oscar Hertwig Oscar Hertwig
- Oscar Pistorius Oscar Pistorius
- Oscar Stanton De Priest Oscar Stanton De Priest
- Osip Mandelstam Osip Mandelstam
- Osiris Osiris
- Oskar Heinroth Oskar Heinroth
- Oskar Kokoschka Oskar Kokoschka
- Osmoregulation Osmoregulation
- Osmosis Osmosis
- Osnabrück (district) Osnabrück (district)
- Osteogenesis Imperfecta Osteogenesis Imperfecta
- Ostinato Ostinato
- Ostracod Ostracod
- Oswald Avery Oswald Avery
- Oswald the Lucky Rabbit Oswald the Lucky Rabbit
- Oswiu of Northumbria Oswiu of Northumbria
- Ot en Sien Ot en Sien
- Ottawa Ottawa
- Otter Otter
- Ottoman architecture Ottoman architecture
- Ottoman Empire Ottoman Empire
- Ottonian dynasty Ottonian dynasty
- Ouija board Ouija board
- Oulu Oulu
- Our (river) Our (river)
- Ouro Preto Ouro Preto
- Ouroboros Ouroboros
- Out of Africa Out of Africa
- Outer Hebrides Outer Hebrides
- Outrigger skis Outrigger skis
- Outstation Outstation
- Over-harvesting Over-harvesting
- Overcharge Overcharge
- Overclocking Overclocking
- Overexposed (album) Overexposed (album)
- Overhead projector Overhead projector
- Overijssel Overijssel
- Overland Expedition Overland Expedition
- Overpopulation Overpopulation
- Overseas departments of France Overseas departments of France
- Overseas France Overseas France
- Overture Overture
- Overweight Overweight
- Oviraptor Oviraptor
- Oviraptorosaur Oviraptorosaur
- Owen Morris Owen Morris
- Owsley Stanley Owsley Stanley
- Ox Mountain Ox Mountain
- Öxabäcks IF Öxabäcks IF
- Oxalaia Oxalaia
- Oxford English Dictionary Oxford English Dictionary
- Oxford Movement Oxford Movement
- Oxfordshire Oxfordshire
- Oxfordshire Ironstone Railway Oxfordshire Ironstone Railway
- Oxidizing agent Oxidizing agent
- Oxpecker Oxpecker
- Oxygen Oxygen
- Oxymoron Oxymoron
- Oxytocin Oxytocin
- Oy-Mittelberg Oy-Mittelberg
- Oyster Oyster
- Oyster card Oyster card
- Ozai Ozai
- Ozama River Ozama River
- Ozzie Newsome Ozzie Newsome
- P versus NP P versus NP
- P-type semiconductor P-type semiconductor
- P. J. Kennedy P. J. Kennedy
- Paaliaq (moon) Paaliaq (moon)
- Pablo Casals Pablo Casals
- Pablo Escobar Pablo Escobar
- Pablo Picasso Pablo Picasso
- Pachacuti Pachacuti
- Pachycephalosauria Pachycephalosauria
- Pacific Division (NHL) Pacific Division (NHL)
- Pacific Northwest Pacific Northwest
- Pacific Ring of Fire Pacific Ring of Fire
- Pacific Time Zone Pacific Time Zone
- Pact of Steel Pact of Steel
- Paddington station Paddington station
- Padma Bhushan Padma Bhushan
- Padma River Padma River
- Padma Shri Padma Shri
- Padua Padua
- Paganism Paganism
- Page Three Page Three
- Pahumara Pahumara
- Paignton Zoo Paignton Zoo
- Päijänne Päijänne
- Paint Paint
- Paintball Paintball
- Painting Painting
- Pair production Pair production
- Pakistan Pakistan
- Pakistan Movement Pakistan Movement
- Pakistan national cricket team Pakistan national cricket team
- Pakistan Peoples Party Pakistan Peoples Party
- Pakistani military Pakistani military
- Palace of Ardashir Palace of Ardashir
- Palace of Caserta Palace of Caserta
- Palacio de la Magdalena Palacio de la Magdalena
- Paladin Paladin
- Palaeocene Palaeocene