| NUS | National University of Singapore | In English | → Higher education, universities |
| NUT | National Union of Teachers | In English | → Organizations and associations → Labour, labour economics → Education |
| NUTS | Nomenclature of Territorial Units for Statistics | In English | → International relations → Regional planning |
| NV | Naamloze Vennootschap = SA | Société Anonyme | In French = SA | Sociedade Anónima | In Portuguese = SA | Sociedad Anónima | In Spanish = ΑΕ | Ανώνυμη Εταιρεία | In Greek = AŞ | Anonim Şirket | In Turkish |
In Dutch | → Economics |
| NVAFB | North Vandenberg Air Force Base | In English | → 358 → Aeronautics, aircraft |
| NVCA | National Venture Capital Association (www.nvca.org) | In English | → Associations → 33676 |
| NVG | Nederlandse Verbond van Groothandel | In Dutch | → Organizations and associations → Trade |
| NVGD | Nederlandse Vereniging van Grammofoonplaten Detailhandelaren | In Dutch | → Organizations and associations → Music → Trade |
| NVQ | National Vocational Qualification | In English | → Specialized or (poly)technical colleges |
| NVVW | Nederlands Verbond van Detailhandelaren in Verf en Wandbekleding | In Dutch | → Organizations and associations → Trade |
| NWCI | National Women's Council of Ireland | In English | → Organizations and associations → Feminism |
| nyrt | Nyilvánosan működő részvénytársaság | In Hungarian | → Economics |
| NYSAFLT | New York State Association of Foreign Language Teachers (www.nysaflt.org) | In English | → Associations → Education → Language, linguistics, literature |
| NYSE | New York Stock Exchange | In English | → Financial markets |
| NYU | New York University (www.nyu.edu) | In English | → Higher education, universities |
| OAIS | Ohio Association of Independent Schools (www.oais.org) | In English | → Associations → Education |
| OAO | Открытое акционерное общество | In Russian | → Economics |
| OAO | Otkrytoe Akcionernoe Obščestvo | In Russian | → Economics |
| OAP | Organització per a l'Alliberament de Palestina = PLO | Palestine Liberation Organization | In English = FAT | Fələstin Azadlıq Təşkilatı | In Azerbaijani = ООП | Организация за освобождение на Палестина | In Bulgarian = OOP | Organizace pro osvobození Palestiny | In Czech = OLP | Organización para la Liberación de Palestina | In Spanish = OLP | Organisation de Libération de la Palestine | In French = PAE | Palestinaren Askapenerako Erakundea | In Basque = OLP | Organizaĵo por Liberigo de Palestino | In Esperanto = OLP | Organización para a Liberación da Palestina | In Galician = PLO | 팔레스타인 해방기구 | In Korean = OLP | Organização para a Libertação da Palestina | In Portuguese = OWP | Organizacja Wyzwolenia Palestyny | In Polish = PLO | パレスチナ解放機構 | In Japanese = ПЛО | Палестинската ослободителна организација | In Macedonian = PIO | Palestinos išsivadavimo organizacija | In Lithuanian = პგო | პალესტინის განთავისუფლების ორგანიზაცია | In Georgian = OLP | Organizzazione per la Liberazione della Palestina | In Italian = ООП | Организация освобождения Палестины | In Russian = ПЛО | Палестинска ослободилачка организација | In Serbian = PLO | 巴勒斯坦解放組織 | In Chinese = OВП | Організація визволення Палестини | In Ukrainian = FKÖ | Filistin Kurtuluş Örgütü | In Turkish |
In Catalan | → Political parties and movements |
| OAPEC | Organization of Arab Petroleum Exporting Countries | In English | → Organizations and associations → Trade → 665 |
| OBFA | Occupational Benevolent Funds Alliance | In English | → Organizations and associations → Labour, labour economics |
| ÖBFA | Österreichische Bundesfinanzierungsagentur (www.oebfa.co.at) | In German | → Central administration → Finance |
| ÖBV | Österreichische Beamtenversicherung | In German | → Labour, labour economics → Insurance |
| OCAP | Ontario Coalition Against Poverty | In English | → Organizations and associations → Economics → Social welfare |
| OCBC | Office Central de lutte contre le trafic des Biens Culturels | In French | → Police |
| OCC | Office of Contract Compliance | In English | → 3474 |
| OCDE | Organizaţia de Cooperare şi Dezvoltare Economică (www.oecd.org) = OECD | Organisation for Economic Cooperation and Development | In English = OCDE | Organisation de Coopération et de Développement Économique | In French = ΟΟΣΑ | Οργανισμός Οικονομικής Συνεργασίας και Ανάπτυξης | In Greek = OESO | Organisasie vir Ekonomiese Samewerking en Ontwikkeling | In Afrikaans = OCDE | Organització per a la Cooperació i el Desenvolupament Econòmic | In Catalan = ОИСР | Организация за икономическо сътрудничество и развитие | In Bulgarian = OECD | منظمة التعاون والتنمية الاقتصادية | In Arabic = OESO | Organisatie voor Economische Samenwerking en Ontwikkeling | In Dutch = OEKE | Organizaĵo pri Ekonomiaj Kunlaboro kaj Evoluigo | In Esperanto = OCDE | Organización para la Cooperación y el Desarrollo Económico | In Spanish = KHEE | Kooperazio eta Hazkunde Ekonomikorako Erakundea | In Basque = OCDE | Organisation de cooperation e de developament economic | In Interlingue = OECD | 경제 협력 개발 기구 | In Korean = OECD | 経済協力開発機構 | In Japanese = OCSE | Organizzazione per la Cooperazione e lo Sviluppo Economico | In Italian = OECD | 经济合作与发展组织 | In Chinese = OECD | Tổ chức Hợp tác và Phát triển Kinh tế | In Vietnamese = OECD | องค์การเพื่อความร่วมมือทางเศรษฐกิจและการพัฒนา | In Thai = ОЭСР | Организация экономического сотрудничества и развития | In Russian = OCDE | Organização para a Cooperação e Desenvolvimento Económico | In Portuguese |
In Romanian | → International relations → International economic cooperation |
| OCDE | Organització per a la Cooperació i el Desenvolupament Econòmic (www.oecd.org) = OECD, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Catalan | → International relations → International economic cooperation |
| OCDE | Organização para a Cooperação e Desenvolvimento Económico (www.oecd.org) = OECD, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Portuguese | → International relations → International economic cooperation |
| OCDE | Organisation de cooperation e de developament economic (www.oecd.org) = OECD, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Interlingue | → International relations → International economic cooperation |
| OCDE | Organización para la Cooperación y el Desarrollo Económico (www.oecd.org) = OECD, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Spanish | → International relations → International economic cooperation |
| OCDE | Organisation de Coopération et de Développement Économique (www.oecd.org) = OECD, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In French | → International relations → International economic cooperation |
| OCDPC | Office pour le Contrôle des Drogues et la Prévention du Crime = ODCCP | Office for Drug Control and Crime Prevention | In English |
In French | → United Nations → Criminal law |
| OCEE | Organització per a la Cooperació Econòmica Europea = OECE | Organisation Européenne de Coopération Économique | In French = OEES | Organisasie vir Europese Ekonomiese Samewerking | In Afrikaans = ΟΕΟΣ | Οργανισμός Ευρωπαϊκής Οικονομικής Συνεργασίας | In Greek = OEEC | Organisation for European Economic Co-operation | In English = OECE | Organizzazione Europea per la Cooperazione Economica | In Italian = OCEE | Organizaţia pentru Cooperare Economică Europeană | In Romanian = OECE | Organização para a Cooperação Económica Europeia | In Portuguese |
In Catalan | → International relations → International economic cooperation |
| OCEE | Organizaţia pentru Cooperare Economică Europeană = OECE, OEES, ΟΕΟΣ, OEEC (look above) |
In Romanian | → International relations → International economic cooperation |
| OCIPED | Omani Centre for Investment Promotion & Export Development | In English | → 33972 |
| OCL | Organisation Communiste Libertaire | In French | → Political parties and movements |
| OCM | Organisations Communes des Marchés | In French | → Organizations and associations → Economics |
| OCP | Office Of Commercial Programs | In English | → Trade |
| OCRB | Office Central pour la Répression du Banditisme | In French | → Police |
| OCRETH | Office Central pour la Répression de la Traite des Êtres Humains | In French | → Police → Slavery |
| OCRFM | Office Central pour la Répression du Faux Monnayage | In French | → Police |
| OCRGDF | Office Central pour la Répression de la Grande Délinquance Financière | In French | → Police → Finance |
| OCRTAEMS | Office Central pour la Répression du Trafic des Armes, des munitions, des produits Explosifs et des Matières Sensibles | In French | → Police → Military engineering |
| OCRTIS | Office Central pour la Répression du Trafic Illicite des Stupéfiants | In French | → Police |
| OCSE | Organizzazione per la Cooperazione e lo Sviluppo Economico (www.oecd.org) = OCDE, OECD, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, ОЭСР (look above) |
In Italian | → International relations → International economic cooperation |
| ODCCP | Office for Drug Control and Crime Prevention = OCDPC (look above) |
In English | → United Nations → Criminal law |
| ODE | Observatoire du Devenir des Étudiants | In French | → Higher education, universities |
| ODE | Observatoire Départemental de l'Eau | In French | → Regional administration → Hydrology → Environmental technology, water supply, waste management |
| ODIT | Observation, Développement et Ingénierie Touristique | In French | → Tourism |
| ODL | Open Distance Learning | In English | → 374 |
| ODM | Objetivos de Desarrollo del Milenio = OMD | Objectifs du Millénaire pour le Développement | In French = MDG | Millennium Development Goals | In German = OSM | Obiettivi di Sviluppo del Millennio | In Italian = TPM | Tujuan Pembangunan Milenium | In Indonesian = MDM | Metas de Desenvolvimento do Milênio | In Portuguese |
In Spanish | → United Nations → Development |
| ÖDOZA | Österreichisches Dokumentationszentrum für Auslandsstudien | In German | → Libraries → Education |
| ODPM | Office of Deputy Prime Minister | In English | → Central administration |
| ODUPA | Organización de Deporte Universitario Panamericano | In Spanish | → Organizations and associations → Higher education, universities → Sport, physical exercises |
| OECD | องค์การเพื่อความร่วมมือทางเศรษฐกิจและการพัฒนา (www.oecd.org) = OCDE, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Thai | → International relations → International economic cooperation |
| OECD | 经济合作与发展组织 (www.oecd.org) = OCDE, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Chinese | → International relations → International economic cooperation |
| OECD | 경제 협력 개발 기구 (www.oecd.org) = OCDE, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Korean | → International relations → International economic cooperation |
| OECD | Tổ chức Hợp tác và Phát triển Kinh tế (www.oecd.org) = OCDE, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Vietnamese | → International relations → International economic cooperation |
| OECD | منظمة التعاون والتنمية الاقتصادية (www.oecd.org) = OCDE, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Arabic | → International relations → International economic cooperation |
| OECD | 経済協力開発機構 (www.oecd.org) = OCDE, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Japanese | → International relations → International economic cooperation |
| OECD | Organisation for Economic Cooperation and Development (www.oecd.org) = OCDE, ΟΟΣΑ, OESO, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In English | → International relations → International economic cooperation |
| OECE | Organizzazione Europea per la Cooperazione Economica = OCEE, OEES, ΟΕΟΣ, OEEC (look above) |
In Italian | → International relations → International economic cooperation |
| OECE | Organização para a Cooperação Económica Europeia = OCEE, OEES, ΟΕΟΣ, OEEC (look above) |
In Portuguese | → International relations → International economic cooperation |
| OECE | Organisation Européenne de Coopération Économique = OCEE, OEES, ΟΕΟΣ, OEEC (look above) |
In French | → International relations → International economic cooperation |
| OEEC | Organisation for European Economic Co-operation = OCEE, OECE, OEES, ΟΕΟΣ (look above) |
In English | → International relations → International economic cooperation |
| OEES | Organisasie vir Europese Ekonomiese Samewerking = OCEE, OECE, ΟΕΟΣ, OEEC (look above) |
In Afrikaans | → International relations → International economic cooperation |
| OEKE | Organizaĵo pri Ekonomiaj Kunlaboro kaj Evoluigo (www.oecd.org) = OCDE, OECD, ΟΟΣΑ, OESO, ОИСР, KHEE, OCSE, ОЭСР (look above) |
In Esperanto | → International relations → International economic cooperation |
| OEKE | Organizaĵo por Ekonomiaj Kunlaboro kaj Evoluigo | In Esperanto | → Organizations and associations → Economics |
| OEPM | Oficina Española de Patentes y Marcas (www.oepm.es) | In Spanish | → Industrial property → Artistic property |
| OER | Open Education Resource | In English | → Education |
| OESO | Organisatie voor Economische Samenwerking en Ontwikkeling (www.oecd.org) = OCDE, OECD, ΟΟΣΑ, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Dutch | → International relations → International economic cooperation |
| OESO | Organisasie vir Ekonomiese Samewerking en Ontwikkeling (www.oecd.org) = OCDE, OECD, ΟΟΣΑ, ОИСР, OEKE, KHEE, OCSE, ОЭСР (look above) |
In Afrikaans | → International relations → International economic cooperation |
| OEST | Observatoire Économique et Statistique des Transports | In French | → Statistics → Economics → Transport and postal services |
| OEZA | Österreichische Entwicklungs- und Ostzusammenarbeit | In German | → International relations |
| OFAJ | Office Franco-Allemand pour la Jeunesse | In French | → Organizations and associations → International relations |
| OFCC | Office of Federal Contract Compliance | In English | → 3474 |
| OFCCP | Office of Federal Contract Compliance Programs | In English | → 3474 |
| OFEFP | Office Fédéral de l'Environnement, des Forêts et du Paysage | In French | → Public administration, government → Nature → Forestry |
| ÖFSE | Österreichische Forschungsstiftung für Entwicklungshilfe | In German | → Foundations → Development |
| OFSPO | Office Fédéral du Sport = BASPO | Bundesamt für Sport | In German |
In French | → Central administration → Sport, physical exercises |
| ÖFV | Österreichisch-Französische Vereinigung (www.oefv.org) | In German | → Organizations and associations → International relations |
| ÖFZ | Österreichisch-Französisches Zentrum für wirtschaftliche Annäherung in Europa | In German | → Economics |
| ÖGB | Österreichische Gewerkschaftsbund | In German | → Organizations and associations → Labour, labour economics |
| ÖGB | Österreichischer Gewerkschaftsbund | In German | → Organizations and associations → Labour, labour economics |
| OGBL | Onofhängege Gewerkschaftsbond Lëtzebuerg | In Letzeburgesh | → Organizations and associations → Labour, labour economics |
| OGE | Observer Group Egypt | In English | → United Nations → Polemology |
| OGG | Observer Group Golan | In English | → United Nations → Polemology |
| OGG-D | Observer Group Golan - Damascus | In English | → United Nations → Polemology |
| OGG-T | Observer Group Golan - Tiberias | In English | → United Nations → Polemology |
| OGL | Observer Group Libanon | In English | → United Nations → Polemology |
| ÖGV | Österreichischer Gewerbeverein | In German | → Economics |
| OHF | Occupational Health Facility | In English | → Labour, labour economics → Medicine |
| OHSU | Oregon Health and Science University (www.ohsu.edu) | In English | → Higher education, universities → Mathematics and natural sciences → Medicine |
| ÖHT | Österreichische Hotel- und Tourismusbank (www.oeht.at) | In German | → Financial markets → Tourism |
| OHT | Organization of History Teachers | In English | → Organizations and associations → Education → History |
| OIA | Office of International Affairs | In English | → International relations |
| OIAC | Organisation pour l'Interdiction des Armes Chimiques (www.opcw.org) = OPWC | Organisation for the Prohibition of Chemical Weapons | In English |
In French | → Organizations and associations → International relations → Military engineering |
| OIC | Organization of the Islamic Conference | In English | → Organizations and associations → Islam → International relations |
| OIEA | Organismo Internacional de Energía Atómica (www.iaea.org) = IAAE | Internacia Agentejo pri Atom-Energio | In Esperanto = IAEA | International Atomic Energy Agency | In English = AIEA | Agence Internationale de l'Énergie Atomique | In French = AIEA | Agenţia Internaţională pentru Energie Atomică | In Romanian = МААЕ | Международна агенция за атомна енергия | In Bulgarian = AIEA | Agència Internacional de l'Energia Atòmica | In Catalan = MAAE | Mezinárodní agentura pro atomovou energii | In Czech = IAEA | Det Internationale Atomenergiagentur | In Danish = IAEO | Internationale Atomenergieorganisation | In German = סבא"א | הסוכנות הבינלאומית לאנרגיה אטומית | In Hebrew = IAEA | International Atomenergie Agence | In Letzeburgesh = AIEA | Agenzia Internazionale per l'Energia Atomica | In Italian = IAEA | अंतर्राष्ट्रीय परमाणु ऊर्जा अधिकरण | In Hindi = MAAE | Меѓународна агенција за атомска енергија | In Macedonian = МАГАТЭ | Международное агентство по атомной энергии | In Russian = AIEA | Agência Internacional de Energia Atómica | In Portuguese = MAEA | Międzynarodowa Agencja Energii Atomowej | In Polish = МАГАТЕ | Міжнародне агентство з атомної енергії | In Ukrainian = UAEA | Uluslararası Atom Enerji Ajansı | In Turkish = IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ | In Thai = EANA | Energia Atomikoaren Nazioarteko Agentzia | In Basque |
In Spanish | → International relations → Energy economics → Nuclear technology |
| OIETAI | Organization for Investment, Economic and Technical Assistance of Iran | In English | → Organizations and associations → Economics → 33972 |
| ÖIJ | Österreichisches Institut für Jugendforschung | In German | |
| OIN | Opération d'Intérêt National | In French | → Politics → Regional planning |
| OIPC | Organisation Internationale de Police Criminelle | In French | → International relations → Police |
| OIR | Organisation Internationale pour les Réfugiés = IRO | International Refugee Organization | In English |
In French | → United Nations → Migrations |
| OIT | Organisation Internationale du Travail = ILO | International Labour Organization | In English = ILO | Internacia Labor-Organizo | In Esperanto |
In French | → United Nations → Labour, labour economics |
| OJEU | Official Journal of the European Union | In English | → Serial publications, periodicals → International relations |
| OJSC | Open Joint Stock Company | In English | → Economics |
| OJT | On-the-Job Training | In English | → Labour, labour economics → Education |
| OKB | Organizata e Kombeve të Bashkuara = UN | Unuigintaj Nacioj | In Esperanto = ONU | Organisation des Nations Unies | In French = ONU | Organizazión d'as Nazions Unitas | In Aragonese = ААН | Арганіза́цыя Аб'ядна́ных На́цый | In Belarusian = VN | Verenigde Nasies | In Afrikaans = ONU | Organización de les Naciones Uníes | In Asturian = OOH | Организацията на обединените нации | In Bulgarian = ABU | Aozadur ar Broadoù Unanet | In Breton = ПНО | Пĕрлешнĕ Нацисен Организацийĕ | In Chuvash = FN | Feriene Naasjes | In Frisian = UN | United Nations | In English = NBE | Nazio Batuen Erakundea | In Basque = ONU | Organización das Nacións Unidas | In Occitan = UN | Unuiĝinta Naciaro | In Esperanto = UN | Ujedinjeni Narodi | In Bosnian = CN | Consociatio Nationum | In Latin = FN | Forenede Nationer | In Danish = UN | Unionita Nacioni | In Ido = ONU | Organizzazione delle Nazioni Unite | In Italian = KU | Kenedhlow Unys | In Cornish = ONU | Organització de les Nacions Unides | In Catalan = ΟΗΕ | Οργανισμός Ηνωμένων Εθνών | In Greek = ΗΕ | Ηνωμένα Έθνη | In Greek = ONU | Organización de las Naciones Unidas | In Spanish = VN | Vereinte Nationen | In German = VN | Verenigde Naties | In Dutch = VN | Vereent Natiounen | In Letzeburgesh = ООН | Организация Oбъединённых Hаций | In Russian = ONU | Organisacion des Nacions unies | FRP = ONZ | Organizacja Narodów Zjednoczonych | In Polish = BMT | Birlashgan Millatlar Tashkiloti | In Uzbek = ООН | Організація Об'єднаних Націй | In Ukrainian = BM | Birleşmiş Milletler | In Turkish = LHiQ | Liên Hiệp Quốc | In Vietnamese = OSN | Organizácia Spojených národov | In Slovak = OZN | Organizacija Združenih Narodov | In Slovenian = УН | Уједињене нације | In Serbian = FN | Förenta nationerna | In Swedish = UM | Umoja wa Mataifa | In Swahili = NU | Nazzioni Uniti | In Sicilian = ONU | Organizaţia Naţiunilor Unite | In Romanian = ONU | Organização das Nações Unidas | In Portuguese = VN | Vereenten Natschonen | NDS = ST | Sameindu Tjóðir | In Faroese = HN | Huñusqa Nasyunkuna | In Quechua = PBB | Pertubuhan Bangsa-bangsa Bersatu | In Malay = NA | Náisiúin Aontaithe | In Irish = ÜRO | Ühinenud Rahvaste Organisatsioon | In Estonian = SÞ | Sameinuðu þjóðanna | In Icelandic |
In Albanian | → International relations → United Nations |
| ÖKB | Österreichische Kontrollbank | In German | → Banks |
| ÖKISTA | Österreichisches Komitee für Internationalen Studentenaustausch | In German | → Organizations and associations → International relations → Higher education, universities |
| OKUNHK | Oficejo de la Kunordiganto de la Unuiĝintaj Nacioj por Helpo kaze de Katastrofo = UNDRO | Office of the United Nations Desaster Relief Coordinator | In English |
In Esperanto | → United Nations → Natural disasters |
| OLAF | Office européen de Lutte Antifraude | In French | → Trade → Criminal law → Industrial property |
| OLP | Organisation de Libération de la Palestine = OAP, PLO, FAT, ООП, OOP, PAE, OWP, ПЛО, PIO, პგო, OВП, FKÖ (look above) |
In French | → Political parties and movements |
| OLP | Organización para a Liberación da Palestina = OAP, PLO, FAT, ООП, OOP, PAE, OWP, ПЛО, PIO, პგო, OВП, FKÖ (look above) |
In Galician | → Political parties and movements |
| OLP | Organización para la Liberación de Palestina = OAP, PLO, FAT, ООП, OOP, PAE, OWP, ПЛО, PIO, პგო, OВП, FKÖ (look above) |
In Spanish | → Political parties and movements |
| OLP | Organizaĵo por Liberigo de Palestino = OAP, PLO, FAT, ООП, OOP, PAE, OWP, ПЛО, PIO, პგო, OВП, FKÖ (look above) |
In Esperanto | → Political parties and movements |
| OLP | Organizzazione per la Liberazione della Palestina = OAP, PLO, FAT, ООП, OOP, PAE, OWP, ПЛО, PIO, პგო, OВП, FKÖ (look above) |
In Italian | → Political parties and movements |
| OLP | Organização para a Libertação da Palestina = OAP, PLO, FAT, ООП, OOP, PAE, OWP, ПЛО, PIO, პგო, OВП, FKÖ (look above) |
In Portuguese | → Political parties and movements |
| OM | Oktatási Minisztérium | In Hungarian | → Central administration |
| OMC | Organisation Mondiale du Commerce = MOK | Monda Organiz(aĵ)o pri Komerco | In Esperanto = MKO | Monda Komerca Organizaĵo | In Esperanto = WTO | World Trade Organization | In English |
In French | → International relations → Trade |
| OMD | Objectifs du Millénaire pour le Développement = ODM, MDG, OSM, TPM, MDM (look above) |
In French | → United Nations → Development |
| OMI | Organisation Maritime Internationale = IMO | International Maritime Organization | In English = IMO | Internacia Mar-Organizo | In Esperanto |
In French | → International relations → Marine research, oceanography → 6295 → Agricultural sciences |
| OMM | Organisation Météorologique Mondiale = MMO | Monda Meteologia Organizo | In Esperanto = WMO | World Meteriological Organization | In English |
In French | → International relations → Meteorology, climatology |
| OMNSH | Observatoire des Mondes Numériques en Sciences Humaines (www.omnsh.org) | In French | → Organizations and associations → Computer science |
| OMPI | Organisation Mondiale de la Propriété Intellectuelle (www.wipo.int) = WIPO | World Intellectual Property Organisation | In English = MOIP | Monda Organizo pri Intelekta Proprieto | In Esperanto = WIPO | World Intellectual Property Organization | In English = OMPI | Organizaţia Mondială a Proprietăţii Intelectuale | In Romanian |
In French | → International relations → Industrial property → Artistic property |
| OMPI | Organizaţia Mondială a Proprietăţii Intelectuale (www.wipo.int) = WIPO, MOIP (look above) |
In Romanian | → International relations → Industrial property → Artistic property |
| OMS | Organisation Mondiale de la Santé = MOS | Monda Organiz(aĵ)o pri Sano | In Esperanto = WHO | World Health Organization | In English = OMS | Organizzazione Mondiale della Sanità | In Italian = WGO | Wêreldgesondheidsorganisasie | In Afrikaans = OMS | Organización Mundial de la Salú | In Asturian = СЗО | Световната здравна огранизация | In Bulgarian = SZO | Světová zdravotnická organizace | In Czech = OMS | Organització Mundial de la Salut | In Catalan = OMS | Organización Mundial de la Salud | In Spanish = MTO | Maailma Terviseorganisatsioon | In Estonian = MOE | Munduko Osasun Erakundea | In Basque = OMS | Organisacion mondiâla de la sandât | FRP = OMS | Organización Mundial da Saúde | In Galician = SZO | Svjetska zdravstvena organizacija | In Croatian = RTD | Rêxistina Tendurustiyê ya Dinyayê | In Kurdish = UMS | Urganizazziun mundiala da la Santaa | In Lombard = PSO | Pasaulio sveikatos organizacija | In Lithuanian = PVO | Pasaules veselības organizācija | In Latvian |
In Esperanto | → United Nations → Medicine |
| OMS | Organizzazione Mondiale della Sanità = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO (look above) |
In Italian | → United Nations → Medicine |
| OMS | Organización Mundial da Saúde = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO (look above) |
In Galician | → United Nations → Medicine |
| OMS | Organización Mundial de la Salú = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO (look above) |
In Asturian | → United Nations → Medicine |
| OMS | Organisacion mondiâla de la sandât = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO (look above) |
[FRP] | → United Nations → Medicine |
| OMS | Organización Mundial de la Salud = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO (look above) |
In Spanish | → United Nations → Medicine |
| OMS | Organització Mundial de la Salut = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO (look above) |
In Catalan | → United Nations → Medicine |
| OMSP | Open Market Selling Price | In English | → Prices |
| OMSP | Organización Mundial de la Salud Pública | In Spanish | → Organizations and associations → International relations → Public health and hygiene |
| OMT | Organizzazione Mondiale del Turismo = OMT | Organisation Mondiale du Tourisme | In French = WTO | World Tourism Organization | In English = СТО | Светска туристичка организација | In Russian = OMT | Organização Mundial de Turismo | In Portuguese = OMT | Organización Mundial del Turismo | In Spanish = OMT | Organizazion Mondiâl dal Turisim | In Friulian |
In Italian | → United Nations → Tourism |
| OMT | Organización Mundial del Turismo = WTO, СТО (look above) |
In Spanish | → United Nations → Tourism |
| OMT | Organizazion Mondiâl dal Turisim = WTO, СТО (look above) |
In Friulian | → United Nations → Tourism |
| OMT | Organisation Mondiale du Tourisme = WTO, СТО (look above) |
In French | → United Nations → Tourism |
| OMT | Organização Mundial de Turismo = WTO, СТО (look above) |
In Portuguese | → United Nations → Tourism |
| ONA | Organizo por Nutrado kaj Agrikulturo = FAO | Food and Agriculture Organization | In English |
In Esperanto | → International relations → Agricultural sciences → Food technology |
| ONBAH | Office National des Barrages et des Aménagements Hydro-agricoles | In French | → Central administration → 627 → Agricultural sciences |
| ONC | Office National de la Chasse | In French | → Central administration → Fishing, hunting |
| OND | Observatoire National de la Délinquance | In French | → Sociology → Law, jurisprudence |
| ONE | Office National d’Électricité | In French | → Central administration → Electrical engineering |
| ONF | Office National des Forêts | In French | → Central administration → Forestry |
| ONISEP | Office National d'Information Sur les Enseignements et les Professions | In French | → Labour, labour economics → Education |
| ONISR | Observatoire National Interministériel de la Sécurité Routière | In French | → Central administration → Transport and postal services |
| ONU | Organisacion des Nacions unies (www.un.org) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
[FRP] | → International relations → United Nations |
| ONU | Organizaţia Naţiunilor Unite = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Romanian | → International relations → United Nations |
| ONU | Organização das Nações Unidas = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Portuguese | → International relations → United Nations |
| ONU | Organización de les Naciones Uníes (www.un.org) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Asturian | → International relations → United Nations |
| ONU | Organizazión d'as Nazions Unitas (www.un.org) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Aragonese | → International relations → United Nations |
| ONU | Organisation des Nations Unies (www.un.org/french/) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In French | → International relations → United Nations |
| ONU | Organizzazione delle Nazioni Unite (www.un.org) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Italian | → International relations → United Nations |
| ONU | Organització de les Nacions Unides (www.un.org) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Catalan | → International relations → United Nations |
| ONU | Organización das Nacións Unidas (www.un.org) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Occitan | → International relations → United Nations |
| ONU | Organización de las Naciones Unidas (www.un.org/spanish/) = OKB, UN, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Spanish | → International relations → United Nations |
| ONZ | Organizacja Narodów Zjednoczonych (www.un.org) = OKB, UN, ONU, ААН, VN, OOH, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Polish | → International relations → United Nations |
| OOH | Организацията на обединените нации (www.un.org) = OKB, UN, ONU, ААН, VN, ABU, ПНО, FN, NBE, CN, KU, ΟΗΕ, ООН, ONZ, BMT, LHiQ, OSN, OZN, УН, UM, ST, HN, PBB, NA, ÜRO, SÞ (look above) |
In Bulgarian | → International relations → United Nations |
| OOP | Organizace pro osvobození Palestiny = OAP, PLO, FAT, ООП, OLP, PAE, OWP, ПЛО, PIO, პგო, OВП, FKÖ (look above) |
In Czech | → Political parties and movements |
| OPAC | Office Public d'Aménagement et de Construction | In French | → Accommodation → Building |
| OPAH | Opération Programmée d'Amélioration de l'Habitat | In French | → Accommodation |
| OPAM | Opera di Promozione dell'Alfabetizzazione nel Mondo | In Italian | → Organizations and associations → Education |
| OPAS | Organização Pan-Americana da Saúde (www.paho.org) = OPS | Organización Panamericana de la Salud | In Spanish = PAHO | Pan American Health Organization | In English |
In Portuguese | → Organizations and associations → International relations → Medicine |
| OPDS | Organ on Politics, Defence and Security | In English | → International relations → 355 |
| OPECST | Office Parlementaire d'Évaluation des Choix Scientifiques et Technologiques | In French | → Research policy → Politics → Engineering, technology |
| OPEIU | Office and Professional Employees International Union | In English | → Organizations and associations → Labour, labour economics |
| OPI | Office du Périmètre d'Irrigation | In French | → Public administration, government → Agricultural sciences |
| OPIP | Office de Promotion des Investissements Privés | In French | → 33972 |
| OPJ | Officier de Police Judiciaire | In French | → Police |
| OPPBTP | Organisme Professionnel de Prévention du Bâtiment et des Travaux Publics (www.oppbtp.fr) | In French | → Organizations and associations → Labour, labour economics → Medicine → Civil engineering → Building |
| OPS | Organización Panamericana de la Salud (www.paho.org) = OPAS, PAHO (look above) |
In Spanish | → Organizations and associations → International relations → Medicine |
| OPWC | Organisation for the Prohibition of Chemical Weapons (www.opcw.org) = OIAC (look above) |
In English | → Organizations and associations → International relations → Military engineering |
| ORA | Organisation de Résistance de l’Armée | In French | → 355 → History |
| ORD | Office of Rare Diseases (http://rarediseases.info.nih.gov) | In English | → 345 → Pathology |
| ORDA | Oficiul Român pentru Drepturile de Autor | In Romanian | → Law, jurisprudence → Public administration, government |
| ORIENT | Oriental Research Infrastructure to European Networks | In English | → Research policy → International relations |
| ORPCF | Organisation pour la Reconstruction du Parti Communiste de France | In French | → Political parties and movements |
| ORSE | Observatoire sur la Responsabilité Sociétale des Entreprises | In French | → Ethics |
| ORTÜ | Orta Doğu Teknik Üniversitesi | In Turkish | → Higher education, universities |
| OS | Operazione Sviluppo | In Italian | → Organizations and associations → Development |
| OSA | Oklahoma Sociological Association | In English | → Associations → Sociology |
| OSC | Orientations Stratégiques Communautaires | In French | → European Union |
| OSCE | Organisation pour la Sécurité et la Coopération en Europe = OSCE | Organization for Security and Cooperation in Europe | In English |
In French | → International relations |
| OSCE | Organization for Security and Cooperation in Europe = (look above) |
In English | → International relations |
| OSCI | Organisation des Opérateurs Spécialisés du Commerce International | In French | → Organizations and associations → Trade |
| OSD | Office of the Secretary of Defense | In English | → 355 → Military engineering |
| OSE | Oeuvre de Secours aux Enfants | In French | → Organizations and associations → Politics |
| OSERS | Office of Special Education and Rehabilitative Services | In English | → Social welfare → Education |
| ÖSFK | Österreichisches Studienzentrum für Frieden und Konfliktlösung | In German | → Research institutes → Polemology |
| ÖSFO | Ökosoziales Forum Österreich | In German | → Organizations and associations |
| OSHA | Occupational Safety and Health Act | In English | → Labour, labour economics → Medicine |
| OSHA | Occupational Safety and Health Administration | In English | → Labour, labour economics → Public administration, government → Medicine |
| OSI | Otto-Suhr-Institut für Politikwissenschaft | In German | → Politics |
| OSI | Open Society Institute | In English | → Politics → Fundamental rights |
| OSIM | Oficiul de Stat pentru Invenţii şi Mărci | In Romanian | → Public administration, government |
| OSM | Obiettivi di Sviluppo del Millennio = ODM, OMD, MDG, TPM, MDM (look above) |
In Italian | → United Nations → Development |