Organizations: O

O

• OakleyAmerican maker of sport and fashion eyewear, based in Foothill Ranch, California; bought by Luxottica in 2007.
• OAPECOrganization of Arab Petroleum Exporting Countries, whose members announced the cut in oil output in October 1973.
• Office of Alien Property CustodianWartime U.S. agency that took control of enemy-owned property in the United States.
• Office of Congressional EthicsIndependent office that reviews allegations against House members and decides whether to refer them to the House Ethics Committee; its site is now titled Office of Congressional Conduct.
• Office of the United Nations High Commissioner for Human RightsUN human rights office; produced the 2010 DRC Mapping Report.
• Ohio Oil CompanyOil producer bought by Standard Oil in 1889; named in the 1911 decree; renamed Marathon Oil in 1962.
• Okavango Diamond CompanyRough diamond sales company of the Government of Botswana.
• OlaySkin care brand of Procter & Gamble.
• OPEC 14 Sep 1960 –Organization of the Petroleum Exporting Countries, founded in Baghdad in September 1960 by five oil-producing countries.
• OpelGerman car maker in Rüsselsheim, owned by General Motors before and during the Second World War.
• Open Markets program at New AmericaAntitrust and anti-monopoly research team at New America until August 2017.
• OpenAI Dec 2015 –American artificial intelligence research organization, founded as a nonprofit in December 2015; it added a capped-profit arm, OpenAI LP, in 2019 and recapitalized it as OpenAI Group PBC in October 2025.
• Oregon Health and Science UniversityPublic university and academic medical center in Portland, Oregon.
• Ottoman court-martial of 1919Military court in Constantinople that in 1919 tried leaders of the Committee of Union and Progress for the massacres of Armenians.
• Ottoman EmpireEmpire ruled from Constantinople; it entered the First World War in November 1914 on the side of the Central Powers.