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