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- OpenFeint
- OpenFlow
- Open format
- Open government
- Open Graph
- Open heart surgery
- Open-high-low-close chart
- Opening Ceremony
- Opening credits
- OpenJS Foundation
- Open List
- Open market operations
- Open Marriage
- Open matte
- OpenPGP
- Open Plan
- Open primary
- Open redirect
- Open Skies Agreement
- Open source license
- Open-source software
- Open-source software
- Open Space Preserve
- OpenSSL
- OpenStack
- Open Standard
- OpenStreetMap
- Open University of Tanzania
- OpenVMS
- Open wheel
- Open Window School Of Visual Communication
- Opera
- Opera
- Opera America
- Operating Cost
- Operating system
- Operational audit
- Operational Costs
- Operational level of war
- Operation Amanda
- Operation Aspides
- Operation Balak
- Operation Barrel Roll
- Operation Bravo
- Operation Car Wash
- Operation Castle
- Operation Chenla II
- Operation Clausewitz
- Operation Commando Hunt
- Operation Crossroads
- Operation Crosstie
- Operation Cyclone
- Operation Dani
- Operation Decisive Storm
- Operation Defensive Shield
- Operation Demetrius
- Operation Forth Bridge
- Operation Freedom Deal
- Operation Influencer
- Operation Iraqi Freedom
- Operation Ivy
- Operation Ivy (band)
- Operation Jaque
- Operation Lam Son 719
- Operation Linebacker II
- Operation London Bridge
- Operation Market Garden
- Operation Neptune Spear
- Operation Paget
- Operation Panther's Claw
- Operation Pegasus
- Operation Pied Piper
- Operation Plowshare
- Operation Plumbbob
- Operation Prosperity Guardian
- Operation Protea
- Operation Ranger
- Operation Reinhard
- Operation Rolling Thunder
- Operations
- Operation Savannah (Angola)
- Operation Shader
- Operation S.I.N.
- Operation Slipper
- Operation Steel Tiger
- Operation Storax
- Operation Streamline
- Operation Strike of the Sword
- Operation Sunbeam
- Operation Sundevil
- Operation Tabarin
- Operation TELIC
- Operation Treadstone
- Operation Trident (Indo-Pakistani War)
- Operation Underground Railroad
- Operation Warp Speed
- Operation Weeting
- Operation Wrath of God
- Operetta
- Opet Festival
- Ophelia
- Opiate
- Opiliones
- Opinion
- Opinion Journalism
- Opinion of the Court
- Opinion Poll
- Opinion polling on the United Kingdom's membership of the European Union (2016–2020)
- Opioid
- Opioid addiction
- Opioids
- Opioid use disorder
- Opium Wars
- Opole Voivodeship
- Oppenheimer
- Oppenheimer (film)
- Oppenheimer–Phillips process
- Oppenheimer security clearance hearing
- Oppenheimer security hearing
- Opportunism
- Opportunistic Infection
- Opportunistic Infections
- Opposition to Artificial Intelligence Art
- Opposition to Immigration
- Opposition to the partition of India
- Oprah
- Oprah's Angel Network
- Oprah's Book Club
- Oprah Winfrey
- Oprah Winfrey Leadership Academy for Girls
- Oprah Winfrey Network
- Oprah Winfrey's endorsement of Barack Obama
- Optical Astronomy
- Optical cavity
- Optical Disc
- Optical Double
- Optical printer
- Optical Scan Voting System
- Optical Scattering
- Optical Science
- Optical Sound
- Optical Switch
- Optical Telescope Element
- Optics
- Optimal Foraging Theory
- Optimality
- Optimism
- Optimization (mathematics)
- Optimization Problem
- Option
- Option (finance)
- Option Offense
- Opus number
- Oracle
- Oracle bone script
- Oracle Corporation
- Oracle Park
- Oral Administration
- Oral Law
- Oral Literature
- Oral Tradition
- Orangeburg-Calhoun Technical College
- Orangeburg County
- Orangeburg County, South Carolina
- Orange County, California
- Orange Free State
- Orange Is the New Black
- Orange UK
- Òran Mór
- Oran Province
- Oratorio
- Oratorio Society of New York
- Oratory
- Orbit
- Orbital Forcing
- Orbital hybridization
- Orbital Mechanics
- Orchestral
- Orchestration
- Order (distinction)
- Ordered Fields
- Ordered Set
- Order (exchange)
- Order in which countries enter the new year
- Order Management System
- Order of Assassins
- Order of Battle for the Battle of Berlin
- Order of Belize
- Order of Chivalry
- Order of Culture
- Order of Culture
- Order of Merit (Jamaica)
- Order of Merit of the Federal Republic of Germany
- Order of Our Lady of Bethlehem
- Order of Precedence
- Order of precedence in the United Kingdom
- Order of Saint Augustine
- Order of St. Michael and St. George
- Order of Succession
- Order of the Arts and Letters