| MAPDR | Ministerul Agriculturii, Pădurilor şi Dezvoltării Rurale | In Romanian | → Agricultural sciences |
| MApn | Ministerul Apărării Naţionale | In Romanian | |
| MARAD | Maritime Administration (www.marad.dot.gov) | In English | → 6295 → Transport and postal services |
| MCC | Ministerul Culturii şi Cultelor | In Romanian | → Civilization, culture, progress → Religion, theology |
| MCTI | Ministerul Comunicaţiilor şi Tehnologiei Informaţiei | In Romanian | → Computer science → Telecommunications |
| MDDEP | Ministère du Développement Durable, de l'Environnement et des Parcs du Québec | In French | → Nature → Environment, environmental sciences |
| MEC | Ministerul Educaţiei şi Cercetării | In Romanian | → Education → Research policy |
| MEC | Ministerio de Educación, Cultura y Deporte | In Spanish | → Education → Civilization, culture, progress |
| MEC | Ministerul Economiei şi Comerţului | In Romanian | → Economics → Trade |
| MEDD | Ministère de l'Écologie et du Développement Durable | In French | → Nature and society |
| MEE | Ministère de l'Environnement et de l'Eau | In French | → Nature and society → Hydrology → 627, |
| MEN | Ministerstwo Edukacji Narodowej (www.ms.gov.pl) | In Polish | → Education |
| MENESR | Ministère de l'Éducation Nationale, de l'Enseignement Supérieur et de la Recherche | In French | → Education → Research policy |
| MESR | Ministère de l'Enseignement Supérieur et de la Recherche | In French | → Education → Research policy |
| MET | Ministère (wallon) de l'Équipement et des Transports | In French | → Civil engineering → Transport and postal services |
| METI | Ministry of Economy, Trade and Industry | In English | → Trade → Industry, industrial policy |
| MFP | Ministerul Finanţelor Publice | In Romanian | → Public finance |
| MIBAC | Ministero per i Beni e le Attività Culturali (www.beniculturali.it) | In Italian | → Civilization, culture, progress |
| MICI | Ministerio de Comercio e Industrias | In Spanish | → Industry, industrial policy → Trade |
| MICIP | Ministerio de Comercio Exterior, Industrialización, Pesca y Competitividad | In Spanish | → Trade → Industry, industrial policy → Fishing, hunting |
| MIE | Ministerul Integrării Europene | In Romanian | → International relations |
| MILS | Mission Interministérielle pour la Lutte contre les Sectes | In French | → Religion, theology |
| MINEFI | MINistère de l'Économie et des FInances | In French | → Economics |
| MINEFI | MINistère de l’Économie, des Finances et de l’Industrie | In French | → Economics → Finance → Industry, industrial policy |
| MITI | Ministry of International Trade and Industry | In English | → Trade → Industry, industrial policy |
| MIVILUDES | Mission interministérielle de vigilance et de lutte contre les dérives sectaires | In French | → Religion, theology |
| MJS | Ministère de la Jeunesse et des Sports | In French | → Sport, physical exercises |
| MKiDN | Ministerstwo Kultury i Dziedzictwa Narodowego (www.mk.gov.pl) | In Polish | → Civilization, culture, progress |
| MMGA | Ministerul Mediului şi Gospodăririi Apelor | In Romanian | |
| MMM | Maa- ja metsätalousministeriö (www.mmm.fi) | In Finnish | |
| MMSSF | Ministerul Muncii, Solidarităţii Sociale şi Familiei | In Romanian | → Social aid |
| MOFA | Ministry of Food and Agriculture | In English | → Agricultural sciences → Food technology |
| MRI | Ministère des Relations Internationales | In French | → International relations |
| MS | Ministerul Sănătăţii | In Romanian | → Public health and hygiene |
| MS | Ministerstwo Sprawiedliwości (www.ms.gov.pl) | In Polish | → Law, jurisprudence |
| MT | Ministerul Transporturilor, Construcţiilor şi Turismului | In Romanian | → Transport and postal services → Building → Tourism |
| MTQ | Ministère des Transports du Québec | In French | → Transport and postal services |
| MVPEI | Ministarstvo vanjskih poslova i europskih integracija | In Croatian | → International relations |
| MZOS | Ministarstvo znanosti, obrazovanja i športa | In Croatian | |
| NASA | National Aeronautics and Space Administration (www.nasa.gov) | In English | → Astronomy → Aeronautics, aircraft → 6297 |
| NASDA | National Space Development Agency | In English | → Astronomy → Spaceflight engineering, astronautics |
| NERSA | National Energy Regulator of South Africa (www.ner.org.za) | In English | → Energy economics |
| NGA | National Geospatial-Intelligence Agency | In English | → Spaceflight engineering, astronautics |
| NHTSA | National Highway Traffic Safety Administration (www.nhtsa.dot.gov) | In English | → Transport and postal services |
| NHWA | National Highway Administration | In English | → Transport and postal services |
| NNSA | National Nuclear Security Administration | In English | → Nuclear technology |
| NOAA | National Oceanic and Atmospheric Administration | In English | → Marine research, oceanography → Meteorology, climatology |
| NRO | National Reconnaissance Organization (www.nro.gov) | In English | |
| NSA | National Security Agency (www.nsa.gov) | In English | |
| ÖBFA | Österreichische Bundesfinanzierungsagentur (www.oebfa.co.at) | In German | → Finance |
| ODPM | Office of Deputy Prime Minister | In English | |
| OFSPO | Office Fédéral du Sport = BASPO | Bundesamt für Sport | In German |
In French | → Sport, physical exercises |
| OM | Oktatási Minisztérium | In Hungarian | |
| ONBAH | Office National des Barrages et des Aménagements Hydro-agricoles | In French | → 627 → Agricultural sciences |
| ONC | Office National de la Chasse | In French | → Fishing, hunting |
| ONE | Office National d’Électricité | In French | → Electrical engineering |
| ONF | Office National des Forêts | In French | → Forestry |
| ONISR | Observatoire National Interministériel de la Sécurité Routière | In French | → Transport and postal services |
| ONT | Office National du Tourisme | In French | → Tourism |
| OST | Office of the Secretary of Transportation | In English | → Transport and postal services |
| PHMSA | Pipeline and Hazardous Materials Safety Administration (www.phmsa.dot.gov) | In English | |
| PSN | Plan Stratégique National | In French | |
| PWGSC | Public Works and Government Services Canada (www.tpsgc-pwgsc.gc.ca) = TPSGC | Travaux Publics et Services Gouvernementaux Canada | In French |
In English | → Civil engineering |
| RGD | Registrar's General Department | In English | |
| RH | Rechnungshof | In German | → Public finance |
| RITA | Research and Innovative Technology Administration (www.rita.dot.gov) | In English | → Research policy → Transport and postal services |
| RNA | Autoritatea Navală Română = RNA | Romanian Naval Authority | In English |
In Romanian | → Transport and postal services |
| RNA | Romanian Naval Authority = (look above) |
In English | |
| RNPP | Registre National des Personnes Physiques | In French | |
| RRA | Rwanda Revenue Authority (www.rra.gov.rw) | In English | → Economics |
| RTT | Radio- ja televisiotekniikan tutkimus | In Finnish | → Organizations and associations |
| SAC | Standardization Administration of China | In English | → Standardization |
| SANDRE | Service d'Administration Nationale des Données et Référentiels sur l'Eau | In French | → Hydrology → 627 → Environmental technology, water supply, waste management |
| SDBDIS | Sous-Direction des Bibliothèques et De l'Information Scientifique | In French | → Libraries → Mathematics and natural sciences |
| SDIG | Sous-Direction de l'Information Générale | In French | → Police |
| SEAMEO | Southeast Asian Ministers of Education Organization | In English | → International relations → Education |
| SECO | State Secretariat for Economic Affairs | In English | → Economics → 33972 |
| SEE | Service de l'Énergie de l'État | In French | → Energy economics |
| SHFG | Society for History in the Federal Government | In English | → Organizations and associations → History |
| SICOP | Service d'Information et de Communication de la Police Nationale | In French | → Police |
| SIF | Service Informatique Fédéral | In French | → Computer science |
| SIG | Service d'Information du Gouvernement | In French | → 0594 |
| SKKM | Staatliches Krisen- und Katastrophenschutzmanagement | In German | → 35175 → Police |
| SSMI | Service de Sécurité du Ministère de l'Intérieur | In French | → Police |
| TD | Télégramme Diplomatique | In French | |
| TKPK | Tim Koordinasi Penanggulangan Kemiskinan (www.tkpkri.org) = TKPKRI | Tim Koordinasi Penanggulangan Kemiskinan Republik Indonesia | In Indonesian |
In Indonesian | → Development |
| TKPKRI | Tim Koordinasi Penanggulangan Kemiskinan Republik Indonesia (www.tkpkri.org) = TKPK (look above) |
In Indonesian | → Development |
| TPSGC | Travaux Publics et Services Gouvernementaux Canada (www.tpsgc-pwgsc.gc.ca) = PWGSC (look above) |
In French | → Civil engineering |
| UBA | Umweltbundesamt | In German | → Environment, environmental sciences |
| UMVF | Université Médicale Virtuelle Francophone | In French | → Higher education, universities → Medicine |
| UNIT | Université Numérique Ingénierie et Technologie | In French | → Higher education, universities → Engineering, technology |
| UNJF | Université Numérique Juridique Francophone | In French | → Higher education, universities → Law, jurisprudence |
| USCIS | United States Citizenship and Immigration Services | In English | → Migrations |
| USDA | United States Department of Agriculture (www.utexas.edu) | In English | → Agricultural sciences |
| USDA | United States Departement of Agriculture | In English | → Agricultural sciences |
| USFWS | United States Fish and Wildlife Service (www.fws.gov) | In English | → Fishing, hunting |
| USPHS | United States Public Health Service | In English | → Medicine |
| USPTO | United States Patent and Trademark Office (www.uspto.gov) | In English | → Industrial property |
| USWB | United States Weather Bureau | In English | → Meteorology, climatology |
| VMD | Veterinary Medicines Directorate (www.vmd.gov.uk) | In English | → Veterinary medicine |
| VROM | Ministerie van Volkshuisvesting, Ruimtelijke Ordening en Milieubeheer (www.vrom.nl) | In Dutch | → Accommodation → Nature and society |
| VTU | (Ministeriet for) Videnskab, Teknologi og Udvikling | In Danish | → Engineering, technology |
| ΓΓΑ | Γενική Γραμματεία Αθλητισμού (www.sport.gov.gr) | In Greek | → Sport, physical exercises |
| ΦΕΚ | Φύλλο Εφημερίδας Κυβερνήσεως | In Greek | → Serial publications, periodicals |
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