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- Observational techniquesIn marketing and the social sciences, observational research (or field research) is a soci
- Occupation of Catalina IslandThe Occupation of Catalina Island (Spanish: Ocupación de la Isla Santa Catalina) began on
- Occupational prestigePublic perception of an individual's job
- Occupational segregationDistribution of workers across and within occupations
- Occupational sexismDiscrimination based on the sex in a place of employment
- Occupy movement hand signalsGroup of hand signals used by Occupy protesters
- Occupy movement in the United States2010s protest movement
- Occupy Wall Street2011 American protest movement
- October 1995 Eastern Sri Lanka massacresMassacre of Sinhalese civilians
- OdalisqueFemale slave or concubine in an Ottoman seraglio
- Office of the Governor of Puerto RicoThe Office of the Governor of Puerto Rico —commonly called La Fortaleza (English: The Fort
- Office to Monitor and Combat Trafficking in PersonsThe Office to Monitor and Combat Trafficking in Persons (J/TIP) is an agency within the Un
- OfficialA person who holds an office
- Old LeftPre-1960s left-wing ideology in the Western world
- Ole Miss riot of 1962Civil unrest in Mississippi, United States
- Olin R. MoyleOlin Richmond Moyle (August 28, 1887 – November 26, 1966) was legal counsel for the Watch
- On Becoming Baby Wise1993 Christian parenting book by Gary Ezzo and Robert Bucknam
- On Practice1937 philosophical work by Mao Zedong
- OnboardingManagement jargon
- One Million SignaturesOne Million Signatures for the Repeal of Discriminatory Laws (Persian: يک ميليون امضا برای
- Online communityVirtual community that exists online
- Online ethnographyApplication of ethnographical research methods on the Internet
- Online hate speechType of hate speech
- Online shamingForm of public shaming
- Only childChild without siblings
- Open ballot systemAn open ballot system is a voting method in which voters vote openly, in contrast to a sec
- Open door policy (business)Corporate communication policy
- Opera Nazionale BalillaItalian Fascist youth organization
- OperaismoItalian Marxist tendency
- OperationalizationPart of the process of research design
- Oponskoye KingdomMythical kingdom in Russian folklore
- Opportunity hoardingOpportunity hoarding occurs when privileged social groups control access to community reso
- Opposition to immigrationBeing opposed to non-citizens entering another country
- Opposition to LGBTQ rightsOpposition to legal rights for lesbian, gay, bisexual, transgender, and queer (LGBTQ) peop
- Opposition to pornographyOverview of opposing views to pornography
- Opposition to the Maunakea ObservatoriesThe Maunakea Observatories have been controversial since the first telescope was built in
- Oradour-sur-Glane massacre1944 mass killing by Nazi German soldiers in France
- Organ giftingSeveral authors have used the terms organ gifting and "tissue gifting" to describe process
- Organic composition of capitalThe organic composition of capital (OCC) is a concept created by Karl Marx in his theory o
- Organisation climateConcept in organisation theory
- Organization developmentStudy and implementation of techniques that affect organizational change
- Organization studiesAcademic field
- Organizational AnthropologySub-field in social anthropology
- Organizational behaviorStudy of human behavior in organizational settings
- Organizational behavior managementSubdiscipline of applied behavior analysis
- Organizational theorySociological study of social organizations
- Organizing (management)Term in management
- OrgiaCult ceremony of Dionysos
- OrgyPeople freely engaging in open and unrestrained sexual activity or group sex
- Original affluent societyTheory in anthropology
- Original net animationAn original net animation (ONA), known in Japan as web anime (ウェブアニメ, webu anime), is an a
- Original video animationAnime designed for release to home video
- Orthodox Jewish feminismMovement in Orthodox Judaism
- Orthodox MarxismBody of Marxist thought, prominent until World War I
- Orthodox PeronismArgentine political ideology
- Óscar ÚnzagaÓscar Únzaga de la Vega (19 April 1916 – 19 April 1959) was a Bolivian political figure an
- OssuaryContainer for dead remains
- Other (philosophy)Concept in philosophy and psychology
- Ottoman courtOverview of the imperial court of the Ottoman Empire
- Ottoman GreeksEthnic Greeks living within the Ottoman Empire
- Ottoman Imperial HaremHarem of the Ottoman Sultan
- Outcast (person)Someone who is rejected or cast out, as from home or society
- OutingDisclosing an LGBTQ person's identity without their consent
- OverpopulationWhen a population of a species exceeds the carrying capacity of its environment