| NORAD | North American Aerospace Defense Command | In English | → 358 → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| NORAD | North American Air Defense Command | In English | → 358 → Military engineering → Aeronautics, aircraft |
| NPT | Navy Pointer and Tracker | In English | → 359 → Military engineering |
| NRL | Naval Research Laboratory (www.nrl.navy.mil) | In English | → Research institutes → 359 |
| NRO | National Reconnaissance Organization (www.nro.gov) | In English | → Central administration |
| NSA | National Security Agency (www.nsa.gov) | In English | → Central administration |
| NSACOR | National Security Agency Central Office of Record | In English | |
| NTDS | Naval Tactical Data System | In English | → Computer science → 359 |
| NVAFB | North Vandenberg Air Force Base | In English | → 358 → Aeronautics, aircraft |
| ÖBFA | Österreichische Bundesfinanzierungsagentur (www.oebfa.co.at) | In German | → Central administration → Finance |
| OCBC | Office Central de lutte contre le trafic des Biens Culturels | In French | → Police |
| 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 |
| ODE | Observatoire Départemental de l'Eau | In French | → Regional administration → Hydrology → Environmental technology, water supply, waste management |
| ODPM | Office of Deputy Prime Minister | In English | → Central administration |
| OFEFP | Office Fédéral de l'Environnement, des Forêts et du Paysage | In French | → Nature → Forestry |
| OFSPO | Office Fédéral du Sport = BASPO | Bundesamt für Sport | In German |
In French | → Central administration → Sport, physical exercises |
| OIPC | Organisation Internationale de Police Criminelle | In French | → International relations → Police |
| OM | Oktatási Minisztérium | In Hungarian | → Central administration |
| 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 |
| ONE | Office National d’Électricité | In French | → Central administration → Electrical engineering |
| ONF | Office National des Forêts | In French | → Central administration → Forestry |
| ONISR | Observatoire National Interministériel de la Sécurité Routière | In French | → Central administration → Transport and postal services |
| ONT | Office National du Tourisme | In French | → Central administration → Tourism |
| OPDS | Organ on Politics, Defence and Security | In English | → International relations → Military affairs |
| OPI | Office du Périmètre d'Irrigation | In French | → Agricultural sciences |
| OPJ | Officier de Police Judiciaire | In French | → Police |
| ORA | Organisation de Résistance de l’Armée | In French | → Military affairs → History |
| ORDA | Oficiul Român pentru Drepturile de Autor | In Romanian | → Law, jurisprudence |
| OSD | Office of the Secretary of Defense | In English | → Military affairs → Military engineering |
| OSHA | Occupational Safety and Health Administration | In English | → Labour, labour economics → Medicine |
| OSIM | Oficiul de Stat pentru Invenţii şi Mărci | In Romanian | |
| OST | Office of the Secretary of Transportation | In English | → Central administration → Transport and postal services |
| OUG | Ordonanţă de Urgenţă a Guvernului | In Romanian | |
| PAFB | Patrick Air Force Base | In English | → 358 → Aeronautics, aircraft |
| PAI | Public Authority for Industry | In English | → Standardization |
| PASTEL | Plateforme d’Assistance Technique Européenne en Lorraine | In French | → Research policy → Regional administration |
| PCM | Plan Communal de Mobilité | In French | → Regional planning → Transport and postal services |
| PDUIF | Plan de Déplacements Urbains d'Ile-de-France | In French | → Transport and postal services |
| PEIA | Prosopography of Early Islamic Administration | In English | → Islam |
| PES | Public Employment Service | In English | → Labour, labour economics |
| PESC | Politica Estera e di Sicurezza Comune = CFSP | Common Foreign and Security Policy | In English = GASP | Gemeinsame Außen- und Sicherheitspolitik | In German = WPZiB | Wspólna polityka zagraniczna i bezpieczeństwa | In Polish = PESC | Politique Étrangère et de Sécurité Commune | In French = GBVB | Gemeenschappelijk Buitenlands en Veiligheidsbeleid | In Dutch = SZPB | Společná zahraniční a bezpečnostní politika | In Czech = СЗБП | Спільна зовнішня та безпекова політика | In Ukrainian = SZPB | Spoločná zahraničná a bezpečnostná politika | In Slovak = PESC | Política Externa e de Segurança Comum | In Portuguese = FUSP | Felles utenriks- og sikkerhetspolitikk | In Norwegian |
In Italian | → European Union → International relations → Police |
| PESC | Politique Étrangère et de Sécurité Commune = CFSP, GASP, WPZiB, GBVB, SZPB, СЗБП, FUSP (look above) |
In French | → European Union → International relations → Police |
| PESC | Política Externa e de Segurança Comum = CFSP, GASP, WPZiB, GBVB, SZPB, СЗБП, FUSP (look above) |
In Portuguese | → European Union → International relations → Police |
| PESD | Politique Européenne de Sécurité et de Défense | In French | → Military affairs → European Union |
| PGPUE | Plan General de Promoción del Uso del Euskera | In English | → Language, linguistics, literature |
| PHMSA | Pipeline and Hazardous Materials Safety Administration (www.phmsa.dot.gov) | In English | → Central administration |
| PJ | Police Judiciaire | In French | → Police |
| PLA | Palestina Liberiga Armeo | In Esperanto | → Military affairs |
| PLI | Pays de la Loire Innovation | In French | → Regional administration → Engineering, technology → Research policy |
| PN | Police Nationale | In French | → Police |
| PP | Préfecture de Police | In French | → Police |
| PPP | Partenariat Public-Privé = PPP | Public Private Partnership | In English |
In French | → Law, jurisprudence |
| PPP | Public Private Partnership = (look above) |
In English | → Law, jurisprudence |
| PQJ | Police aux Questions Juives | In French | → Police |
| PRAI | Programme Régional d’Actions Innovatrices | In French | → Regional administration → Engineering, technology |
| PRE | Police Régionale d'Etat | In French | → Police |
| PSN | Plan Stratégique National | In French | → Central administration |
| PTS | Police Technique et Scientifique | In French | → Police |
| PWGSC | Public Works and Government Services Canada (www.tpsgc-pwgsc.gc.ca) = TPSGC | Travaux Publics et Services Gouvernementaux Canada | In French |
In English | → Central administration → Civil engineering |
| RAN | Royal Australian Navy | In English | → 359 |
| RAPACE | Répertoire Automatisé Pour l’Analyse des Contrefaçons de l’Euro | In French | → Police |
| RENAR | Asociaţia Română de Acreditare | In Romanian | → Associations |
| RER | Réseau Europe Régions | In French | → Research policy → Regional administration |
| RG | Renseignements Généraux | In French | → Police |
| RGD | Régie de Gestion des Données | In French | → Computer science → Knowledge management |
| RGD | Registrar's General Department | In English | → Central administration |
| RH | Rechnungshof | In German | → Central administration → Public finance |
| RI | Régiment d'Infanterie | In French | → 356 |
| RIDS | Rockwell Integrated Defense Simulator | In English | → Military affairs → Computer simulation |
| RITA | Research and Innovative Technology Administration (www.rita.dot.gov) | In English | → Central administration → Research policy → Transport and postal services |
| RNA | Romanian Naval Authority = RNA | Autoritatea Navală Română | In Romanian |
In English | → Central administration |
| RNA | Autoritatea Navală Română = (look above) |
In Romanian | → Central administration → Transport and postal services |
| RNPP | Registre National des Personnes Physiques | In French | → Central administration |
| RRA | Rwanda Revenue Authority (www.rra.gov.rw) | In English | → Economics → Central administration |
| RSN | Refuser Solidarity Network (www.refusersolidarity.net) | In English | → Organizations and associations → Politics → Military affairs |
| RTT | Radio- ja televisiotekniikan tutkimus | In Finnish | → Organizations and associations → Central administration |
| SA | Sturmabteilung | In German | → Military affairs → History |
| SAC | Strategic Air Command | In English | → 358 |
| SAC | Standardization Administration of China | In English | → Central administration → Standardization |
| SAFSP | Secretary of the Air Force Special Projects | In English | → 358 |
| SAN | Syndicat d'Agglomération Nouvelle | In French | |
| SANDRE | Service d'Administration Nationale des Données et Référentiels sur l'Eau | In French | → Central administration → Hydrology → 627 → Environmental technology, water supply, waste management |
| SAP | Section des Atterrissages et Parachutages | In French | → 358 → History |
| SARM | Saskatchewan Association of Rural Municipalities | In English | → Associations |
| SAS | Special Air Service | In English | → 358 → History |
| SCA | Service Central Automobile | In French | → Automobile manufacturing |
| SCCRS | Service Central des Compagnies Républicaines de Sécurité | In French | → Police |
| SCDC | Service Central de Documentation Criminelle | In French | → Police |
| SCIJ | Service Central de l'Identité Judiciaire | In French | → Police |
| SCODRACO | Section Centrale Opérationnelle de Documentation, du Renseignement et d'Analyse du Crime Organisé | In French | → Police |
| SCRS | Service Canadien du Renseignement de Sécurité | In French | → Police |
| SCTIP | Service de Coopération Technique Internationale de Police | In French | → International relations → Police |
| SD/AFSC | Space Division/Air Force Systems Command | In English | → 358 → Spaceflight engineering, astronautics |
| SD/SP | Space Division Directorate of Security | In English | → Military affairs → Spaceflight engineering, astronautics |
| SDA | Service Départemental de l'Architecture | In French | → Regional administration → Architecture |
| SDAG | Strategic Defense Advisory Group | In English | → Military affairs |
| SDAT | Sous-Direction Antiterroriste (de la Police Judiciaire) | In French | → Police |
| SDBDIS | Sous-Direction des Bibliothèques et De l'Information Scientifique | In French | → Central administration → Libraries → Mathematics and natural sciences |
| SDC | Strategic Defense Command | In English | → Military affairs |
| SDC | Strategic Defense Center | In English | → Military affairs |
| SDCC | Strategic Defense Command Center | In English | → Military affairs |
| SDCCC | Space Defense Command Communication Center | In English | → Military affairs → Telecommunications → Spaceflight engineering, astronautics |
| SDCOC | Space Defense Command Operations Center | In English | → Military affairs → Telecommunications → Spaceflight engineering, astronautics |
| SDI | Strategic Defense Initiative | In English | → Military affairs |
| SDIO | Strategic Defense Initiative Office | In English | → Military affairs |
| SDIO | Strategic Defense Initiative Organization | In English | → Organizations and associations → Military affairs → Military engineering |
| SDIP | Strategic Defense Initiative Program | In English | → Military affairs |
| SDIS | Service Départemental d’Incendie et de Secours | In French | → Municipal administration |
| SDOPS | Strategic Defense Operational Planning Support | In English | → Military affairs |
| SDP | Strategic Defense Program | In English | → Military affairs → Military engineering |
| SDSC | Strategic and Defence Studies Centre | In English | → Military affairs |
| SEAMEO | Southeast Asian Ministers of Education Organization | In English | → International relations → Central administration → Education |
| SECO | State Secretariat for Economic Affairs | In English | → Economics → Central administration → 33972 |
| SEE | Service de l'Énergie de l'État | In French | → Central administration → Energy economics |
| SEF | Section Économique et Financière | In French | → Police → Economics → Finance |
| SEM | Société d'Économie Mixte | In French | → Economics |
| SEMWS | Survivable, Endurable Missile Warning System | In English | → Military affairs → Military engineering |
| SENACYT | Secretaría Nacional de Ciencia y Tecnología | In Spanish | → Mathematics and natural sciences → Applied sciences, technology |
| SETC | State Employees Trades Council | In English | → Labour, labour economics |
| SFPD | San Francisco Police Department (www.sfgov.org/police) | In English | → Police |
| SGAR | Secrétariat Général pour les Affaires Régionales | In French | → Regional administration |
| SGASU | Secrétaire Général d'Administration Scolaire et Universitaire | In French | → Education |
| SHFG | Society for History in the Federal Government | In English | → Organizations and associations → Central administration → History |
| SICOP | Service d'Information et de Communication de la Police Nationale | In French | → Police → Central administration |
| SIER | Service Interdépartemental d'Exploitation Routière | In French | → Transport and postal services |
| SIF | Service Informatique Fédéral | In French | → Computer science → Central administration |
| SIFC | Service de l'Instruction des Forces Canadiennes | In French | → Military affairs → Education |
| SIG | Service d'Information du Gouvernement | In French | → 0594 → Central administration |
| SKKM | Staatliches Krisen- und Katastrophenschutzmanagement | In German | → 35175 → Police → Central administration |
| SMH | Society for Military History | In English | → Organizations and associations → Military affairs → History |
| SMI | Structure Militaire d'Intégration | In French | → Military affairs |
| SN | Sûreté Nationale | In French | → Police |
| SNM | Service National Maquis | In French | → Political parties and movements → Military affairs → History |
| SODSIM | Strategic Offense-Defense Simulation | In English | → Military affairs → Military engineering |
| SOE | Special Operations Executive | In English | |
| SOL | Service d'Ordre Légionnaire | In French | → Police |
| SPA | Social Policy Analysis | In English | → Politics |
| SPHP | Service de Protection des Hautes Personnalités | In French | → Police |
| SPINES | Science and Technology Policy Information Exchange System | In English | → Research policy → Mathematics and natural sciences → Applied sciences, technology |
| SQ | Sûreté du Québec | In French | → Police |
| SRPJ | Service Régional de Police Judiciaire | In French | → Police |
| SRPT | Service Régional de la Police des Transports | In French | → Transport and postal services |
| SRU | (Loi relative) à la Solidarité et au Renouvellement Urbain | In French | → Social welfare → Regional planning |
| SS | Schutzstaffel | In German | → Military affairs → History |
| SSMI | Service de Sécurité du Ministère de l'Intérieur | In French | → Police → Central administration |
| SSS | Service des Sociétés Secrètes | In French | → Organizations and associations → Police |
| ST | Surveillance du Territoire | In French | → Police |
| STIC | Système de Traitement de l'Information Criminelle | In French | → Police |
| STRADEM | Strategic Defense Effectiveness Model | In English | → Military affairs → Military engineering |
| SVAFB | South Vandenberg Air Force Base | In English | → 358 |
| SWD | Social Welfare Department | In English | → Social welfare |
| SZPB | Společná zahraniční a bezpečnostní politika = PESC, CFSP, GASP, WPZiB, GBVB, СЗБП, FUSP (look above) |
In Czech | → European Union → International relations → Police |
| SZPB | Spoločná zahraničná a bezpečnostná politika = PESC, CFSP, GASP, WPZiB, GBVB, СЗБП, FUSP (look above) |
In Slovak | → European Union → International relations → Police |
| TAC | Tactical Air Command | In English | → 358 |
| TAHD | Torrington Area Health District | In English | → Municipal administration → Medicine |
| TAR | Tribunale Amministrativo Regionale | In Italian | → Law, jurisprudence |
| TD | Télégramme Diplomatique | In French | → Central administration |
| TKPK | Tim Koordinasi Penanggulangan Kemiskinan (www.tkpkri.org) = TKPKRI | Tim Koordinasi Penanggulangan Kemiskinan Republik Indonesia | In Indonesian |
In Indonesian | → Central administration → Development |
| TKPKRI | Tim Koordinasi Penanggulangan Kemiskinan Republik Indonesia (www.tkpkri.org) = TKPK (look above) |
In Indonesian | → Central administration → Development |
| TOC | Tactical Operations Center | In English | → Military affairs |
| TOM | Territoire d’Outre-Mer | In French | → Regional administration → Geography |
| TPSGC | Travaux Publics et Services Gouvernementaux Canada (www.tpsgc-pwgsc.gc.ca) = PWGSC (look above) |
In French | → Central administration → Civil engineering |
| TW/AA | Tactical Warning/Attack Assessment | In English | → Military affairs → Military engineering |
| UBA | Umweltbundesamt | In German | → Central administration → Environment, environmental sciences |
| UCLAT | Unité de Coordination de la Lutte Anti-Terroriste | In French | |
| UCRAM | Unité de Coordination et de Recherches Anti-Mafia | In French | → Police |
| UFP | Unión Federal de Policia | In Spanish | → Organizations and associations → Police |
| UKAEA | United Kingdom Atomic Energy Agency | In English | → Energy economics → Nuclear technology |
| UMVF | Université Médicale Virtuelle Francophone | In French | → Higher education, universities → Medicine → Central administration |
| UNIT | Université Numérique Ingénierie et Technologie | In French | → Higher education, universities → Engineering, technology → Central administration |
| UNJF | Université Numérique Juridique Francophone | In French | → Higher education, universities → Law, jurisprudence → Central administration |
| UNSC | United Nations Space Command | In English | → Military affairs → United Nations → Spaceflight engineering, astronautics |
| UPCP | Unión del Personal Civil de la Provincia | In Spanish | → Organizations and associations → Labour, labour economics → Regional administration |
| UPCP | Union du Personnel du Corps de Police | In French | → Labour, labour economics → Police |
| USAF | United States Air Force | In English | → 358 |
| USAMRIID | United States Army Medical Research Institute of Infectious Diseases | In English | → Military affairs → Infectious diseases |
| USASDC | United States Army Strategic Defense Command | In English | → Military affairs |
| USASDG | United States Army Space Defense Group | In English | → Military affairs → Military engineering → Spaceflight engineering, astronautics |
| USCG | United States Coast Guard | In English | → Police |
| USCIS | United States Citizenship and Immigration Services | In English | → Migrations → Central administration |
| USDA | United States Departement of Agriculture | In English | → Central administration → Agricultural sciences |
| USDA | United States Department of Agriculture (www.utexas.edu) | In English | → Central administration → Agricultural sciences |
| USFWS | United States Fish and Wildlife Service (www.fws.gov) | In English | → Central administration → Fishing, hunting |
| USMC | United States Marine Corps | In English | → 359 |
| USN | United States Navy | In English | → 359 |
| USNS | United States Navy Ship | In English | → 359 → 6295 |
| USPHS | United States Public Health Service | In English | → Central administration → Medicine |
| USPTO | United States Patent and Trademark Office (www.uspto.gov) | In English | → Central administration → Industrial property |
| USWB | United States Weather Bureau | In English | → Central administration → Meteorology, climatology |
| VAFB | Vandenberg Air Force Base | In English | → 358 |
| VDSÖ | Vereinigung Demokratischer Soldaten Österreichs | In German | → United Nations → Military affairs |
| VIA | Volontaire/Volontariat International en Administration | In French | → Labour, labour economics |
| VMD | Veterinary Medicines Directorate (www.vmd.gov.uk) | In English | → Central administration → Veterinary medicine |
| VÖWG | Verband der Öffentlichen Wirtschaft und Gemeinwirtschaft Österreichs | In German | → Organizations and associations |
|