

| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| LJLL | Laboratoire Jacques-Louis Lions | In French | → Research institutes → Numerical analysis | 
| LK | Lingva Komitato | In Esperanto | → Linguistics | 
| LKD | Linux Kullanıcıları Derneği (www.lkd.org.tr) | In Turkish | → Associations → Operating systems → Turkey | 
| LKK | Loka Kongresa Komitato | In Esperanto | → Congresses | 
| LKV | Limburgse Kynologen Vereniging | In Dutch | |
| LLI | Laboratoire de Linguistique Informatique | In French | → Research institutes → Computer science → Linguistics | 
| LLNL | Lawrence Livermore National Laboratories | In English | → Research institutes | 
| LLNL | Lawrence Livermore National Laboratory | In English | → Research institutes | 
| LMC3O | Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique | In English | → Research institutes → Chemistry | 
| LMD | Laboratoire de Météorologie Dynamique | In French | → Research institutes → Meteorology, climatology | 
| LME | London Metal Exchange (https://www.lme.com) | In English | → Economics → Metallurgy → United Kingdom | 
| LMEI | London Middle East Institute (https://www.soas.ac.uk/lmei/) | In English | → Research institutes → Area studies → United Kingdom | 
| LMFA | Laboratoire de Mécanique des Fluides et d'Acoustique (www.lmfa.ec-lyon.fr) | In French | → Research institutes → Fluid mechanics → Aerodynamics → Physics → France | 
| LMGP | Laboratoire des Matériaux et du Génie Physique | In French | → Research institutes → Materials science → Physics | 
| LMI | Laboratory of Molecular Imaging | In English | → Research institutes → Biochemistry, biophysics | 
| LMM | Laboratory of Metabolic Medicine | In English | → Research institutes → Physiology | 
| LMO | Lilloise Machines Outils | In French | → Trade → Mechanical engineering → France | 
| LMO | Laboratorium voor Modelonderzoek | In Dutch | → Research institutes | 
| LMO | Linker Maas Oever | In Dutch | → Sport, physical exercises | 
| LMO | Laboratoire de Mathématiques d'Orsay | In French | → Research institutes → Mathematics | 
| LMP | Laboratoire de Microélectronique de Puissance | In French | → Research institutes → Electronics → Energy economics | 
| LMSS | Liverpool Medical Students Society | In English | → Higher education, universities → Medicine → United Kingdom | 
| LMT | Laboratoire de Mécanique et Technologie | In French | → Research institutes → Mechanical engineering → Engineering, technology | 
| LNCC | Ligue Nationale Contre le Cancer | In French | → Oncology | 
| LNE | Laboratoire National d'Essais | In French | → Research institutes | 
| LNEC | Laboratório Nacional de Engenharia Civil | In Portuguese | → Research institutes → Construction → Civil engineering | 
| LNNL | Lawrence Livermore National Laboratory | In English | → Research institutes | 
| LNR | Ligue Nationale de Rugby | In French | → Football and rugby | 
| LO | Landsorganisationen I Danmark | In Danish | → Labour, labour economics → Denmark | 
| LOC | Laat Ons Combineren | In Dutch | → Sport, physical exercises | 
| LOCI | Laboratory for Optical and Computational Instrumentation | In English | → Research institutes → Optics → Computer science | 
| LOLICA | Logiciels Libres en Champagne-Ardenne | In French | → Software | 
| LoLiTa | Logiciels Libres à Tahiti et ses îles | In French | → Software | 
| LONGA | Lichaams Ontwikkeling Na Gedane Arbeid | In Dutch | → Sport, physical exercises | 
| LPCI | Laboratoire de Physico-Chimie Industrielle | In French | → Research institutes → Chemical technology | 
| LPEQ | Laboratoire de Psychologie Expérimentale et Quantitative (www.unice.fr/lpeq/) | In French | → Research institutes → Psychology | 
| LPES | Laboratoire de Physique Électronique des Solides | In French | → Research institutes → 53912 | 
| LPF | Liga de Fútbol Profesional (www.lfp.es) | In Spanish | → Football and rugby → Spain | 
| LPIC | Ligue de Protection des Internautes Câblés | In French | → Internet → Consumerism → Telecommunications | 
| LPL | Laboratoire de Physique des Lasers | In French | → Research institutes → Magnetism | 
| LPM | Laboratoire de Physique de la Matière | In French | → Research institutes → 539 | 
| LPMA | Laboratoire de Probabilités et Modèles Aléatoires | In French | → Research institutes → Mathematics | 
| LPMC | Laboratoire de Physique de la Matière Condensée (http://pmc.polytechnique.fr) | In French | → Research institutes → Physics of condensed matter → France | 
| LPMMH | Laboratoire de Physique et Mécanique des Milieux Hétérogènes (www.pmmh.espci.fr) | In French | → Research institutes → Physics | 
| LPMTM | Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux | In French | → Research institutes → Mechanics → Thermodynamics | 
| LPO | Ligue pour la Protection des Oiseaux (www.lpo.fr) | In French | → 5023 → France | 
| LPPA | Laboratoire de la Physiologie, de la Perception et de l'Action | In French | → Research institutes → Physiology | 
| LPPE | Laboratoire de Physiologie et de Psychologie Expérimentales | In French | → Research institutes → Psychology → Physiology | 
| LPRL | Laboratoire de Physique du Rayonnement et de la Lumière | In French | → Research institutes → Electromagnetism | 
| LPS | Laboratoire de Police Scientifique | In French | → Research institutes → Police | 
| LRC | Leerdamse Racing Club | In Dutch | → Sport, physical exercises | 
| LREC | Laboratorio Regional de Engenharia Civil | In Portuguese | → Research institutes → Civil engineering → Construction | 
| LRF | Laogai Research Foundation | In English | → Foundations | 
| LRI | Laboratoire de Recherche en Informatique | In French | → Research institutes → Computer science | 
| LRPAT | Laboratoire de Recherche en Pathologies Radio-induites | In French | → Research institutes → Pathology | 
| LSA | Limburgse Stichting Autisme (www.lsautisme.be) | In Dutch | → Foundations → Belgium | 
| LSC | Lycurgus Sparta Combinatie | In Dutch | → Sport, physical exercises | 
| LSEC | Laag Soeren Eerbeek Combinatie | In Dutch | → Sport, physical exercises | 
| LSG | Ligo de Samseksamaj Geesperantistoj | In Esperanto | → Artificial languages (linguistics) | 
| LSGC | Laboratoire des Sciences du Génie Chimique | In French | → Research institutes → Chemistry → Chemical technology | 
| LSM | Lembaga Swadaya Masyarakat = ONGs | Organizações Não Governamentais | In Portuguese = NGO | Non-Governmental Organization | In English = NGO | Nichtregierungsorganisation | In German = ANG | Aozadur Nann-Gouarnamantel | In Breton = ONG | Organisation Non Gouvernementale | In French = NRO | Ne-Registara Organizo | In Esperanto = ONG | Organizzazione non governativa | In Italian = ONG | Organización non gobernamental | In Galician = GKE | Gobernuz Kanpoko Erakunde | In Basque = ONG | Organización no gubernamental | In Spanish = ΜΚΟ | Μη κυβερνητικές οργανώσεις | In Greek = NNO | Nevládní nezisková organizace | In Czech = ONG | Organització no governamental | In Catalan = ННО | Неурядові неприбуткові організації | In Ukrainian = ONG | Organização não governamental | In Portuguese = NGO | Niet-gouvernementele organisatie | In Dutch = NVO | Nevyriausybinė organizacija | In Lithuanian | In Indonesian | |
| LSP | Linguistic Society of the Philippines | In English | → Linguistics | 
| LSRS | Laboratory for Spintronics Research in Semiconductors | In English | → Research institutes → Electronics | 
| LSSL | Life Sciences Space Laboratory | In English | → Research institutes → Biological sciences → Astronautics | 
| LSTA | Laboratoire de Statistique Théorique et Appliquée | In French | → Research institutes → Statistics | 
| LSU | Lesben und Schwule in der Union (www.lsu-online.de) | In German | → Christian-democratic parties → Germany | 
| LSV | Lennisheuvelse Sport Vereniging | In Dutch | → Sport, physical exercises | 
| LSV | Leerdamse Sportvereniging Voorwaarts | In Dutch | → Sport, physical exercises | 
| LSV | Lonnekerse Sport Vereniging | In Dutch | → Sport, physical exercises | 
| LSVD | Lesben- und Schwulenverband in Deutschland | In German | → Germany | 
| LSVV | Langedijker Sport Vereniging Voorwaarts | In Dutch | → Sport, physical exercises | 
| LSVV | Leidse Studenten Voetbal Vereniging | In Dutch | → Higher education, universities → Football and rugby | 
| LTC | Langedijk Talmastraat Combinatie | In Dutch | → Sport, physical exercises | 
| LTF | Lyon Turin Ferroviaire | In French | → Civil engineering and land transport → Rail transport engineering → Rail transport | 
| LTN | London Technology Network | In English | → Engineering, technology → United Kingdom | 
| LTO | Land- en Tuinbouworganisatie | In Dutch | |
| LTSI | Laboratoire Traitement du Signal et Instrumentation | In French | → Research institutes → Telecommunications | 
| LTT | Laboratory of Thermal Turbomachines | In English | → Research institutes → Mechanical engineering | 
| LTV | Latvijas Tirgotāju Asociācija | In Latvian | → Trade | 
| LUCE | L'Unione Cinematografica Educativa | In Italian | → Cinema, movies | 
| LUD | Liga Universitaria de Deportes | In Spanish | → Higher education, universities → Sport, physical exercises | 
| LUG | Linux Users' Groups = GUL | Groupes d'Utilisateurs de Linux | In French | In English | → Operating systems | 
| LUGOAL | Linux User Group Of ALgeria (www.lugoal.org) | In English | → Operating systems → Algeria | 
| LULAC | League of United Latin American Citizens | In English | |
| LUM | Lehrervereinigung der Urner Mittelschule | In German | → Education | 
| LURE | Laboratoire d'Utilisation du Rayonnement Électromagnétique | In French | → Research institutes → Electricity, magnetism, electromagnetism | 
| LUSSI | Laboratoire UltraSons, Signaux et Instrumentation (www.lussi.univ-tours.fr) | In French | → Research institutes → Diagnostics → France | 
| LUSU | Laurentian University Staff Union = SEUL | Syndicat des Employés de l'Université Laurentienne | In French | In English | → Labour, labour economics → Higher education, universities | 
| LVA | Laboratoire Vibrations-Acoustique | In French | → Research institutes → Acoustics | 
| LVC | Leeuwarder Voetbal Club | In Dutch | → Football and rugby | 
| LVC | Loppersumse Voetbal Club | In Dutch | → Football and rugby | 
| LVE | Lille-Villeneuve-Espéranto | In French | → Artificial languages (linguistics) → France | 
| LVFO | Lake Victoria Fisheries Organization | In English | → Fishing, hunting | 
| LVV | Larense Voetbal Vereniging | In Dutch | → Football and rugby | 
| LVV | Leeuwarder Voetbal Vereniging | In Dutch | → Football and rugby | 
| LVV | Leidsche Voetbal Vereeniging | In Dutch | → Football and rugby → Netherlands | 
| MA | Membro-Abonanto | In Esperanto | → Newspapers, journalism | 
| MAA | Medieval Academy of America (www.medievalacademy.org) | In English | → Academies → History → United States | 
| MAA | Mathematical Association of America (www.maa.org) | In English | → Associations → Mathematics → United States | 
| MAA | Michigan Assessors Association (www.maa-usa.org) | In English | → Associations → 332 | 
| MAACA | Mouvement Anti-Autoritaire Contre l'Armée | In French | → Anarchist organizations | 
| MAAO | Maryland Association Assessing Officers (www.maao-md.org) | In English | → Associations → 332 | 
| MAAO | Massachusetts Association of Assessing Officers (www.maao.org) | In English | → Associations → 332 → United States | 
| MABA | Maine Antiquarian Booksellers Association (www.mainebooksellers.org) | In English | → Associations → Trade → Graphic industries, printing, publishing → United States | 
| MAC | Movimento Apostolico Ciechi | In Italian | → Christianity | 
| MACASBE | Macau Association of Business Ethics | In English | → Associations → Ethics | 
| MACVNR | Mexican Association for Computer Vision, Neurocomputing and Robotics | In English | → Associations → Computer-based techniques → Artificial intelligence → Applied sciences, technology → Mexico | 
| MAEH | Mouvement pour l'Amélioration de l'Environnement Hospitalier | In French | → Medicine | 
| MAGIS | Movimento e Azione dei Gesuiti Italiani per lo Sviluppo | In Italian | → Education → Development → Italia | 
| MAIF | Martial Arts International Federation | In English | → Sport, physical exercises | 
| Mockup And Integration Laboratory | In English | → Research institutes → Mechanical engineering | |
| MAK | Museum für angewandte Kunst | In German | → Museums → Arts | 
| MALC | Metal Articles Liaison Committee | In English | → Metallurgy | 
| MAM | Musée d'Art Moderne | In French | → Museums → Arts | 
| MAP | Medieval Association of the Pacific | In English | → Associations → History | 
| MAP | Міжнародна асоціація розвитку = IDA | International Development Association | In English = AID | Association Internationale de Développement | In French = AIF | Asociación Internacional de Fomento | In Spanish = AID | Associação Internacional de Desenvolvimento | In Portuguese = МАР | Международная ассоциация развития | In Russian | In Serbian | → Associations → Development | 
| MARAAS | Mid-Atlantic Region Association for Asian Studies | In English | → Associations → Area studies | 
| MARC | Modern Asia Research Centre | In English | → Research institutes → Area studies | 
| MARC | Motorcycling Amateur Radio Club | In English | → Telecommunications | 
| MARS | Manned Astronautical Research Station | In English | → Research institutes → Astronautics | 
| MASAAV | Mid-Atlantic States Association of Avian Veterinarians (www.masaav.org) | In English | → Associations → Veterinary medicine | 
| MASC | Machine Administratie Scheepsbouw Combinatie | In Dutch | → Sport, physical exercises | 
| MASC | Malzéville Association Sport et Culture | In French | → Associations → Sport, physical exercises → Civilization, culture, progress | 
| MASS | Mexican Association for Semiotic Studies | In English | → Associations → Semiotics → Mexico | 
| MASTTAR | Minimal Access Surgery Teaching, Training and Research Center | In English | → Research institutes → Specialized or polytechnical colleges → Surgery, orthopaedics, ophthalmology | 
| MASV | Midden Arnhemse Sport Vereniging | In Dutch | → Sport, physical exercises | 
| MAUSS | Mouvement Anti-Utilitariste dans les Sciences Sociales | In French | → Social sciences | 
| MAVMA | Massachusetts Veterinary Medical Association (www.massvet.org) | In English | → Associations → Veterinary medicine → United States | 
| MAVN | Mesures alternatives des Vallées du Nord | In French | |
| MAVOE | Magyar Vasútmodellezők es Vasútbarátok Országos Egyesülete | In Hungarian | → Entertainment → Rail transport engineering | 
| MB | Marburger Bund | In German | → Labour, labour economics | 
| MBS | Museum Buurt Spoorweg | In Dutch | → Museums | 
| MBS | Miniature Book Society | In English | → Libraries | 
| MCC | Maria Congregatie Club | In Dutch | → Sport, physical exercises → Christianity | 
| MCE | Movimento di Cooperazione Educativa | In Italian | → Education | 
| MCEER | Multidisciplinary Center for Earthquake Engineering Research (http://mceer.buffalo.edu) | In English | → Research institutes → Seismology, earthquakes → United States | 
| MCEP | Movimiento Cooperativo de Escuela Popular | In Spanish | → Education | 
| MCHC | Metropolitan Chicago Healthcare Council (www.mchc.org) | In English | → Medicine → United States | 
| MCHC | Metropolitan Collegiate Hockey Conference (www.methockey.com) | In English | → Sport, physical exercises → United States | 
| MCHC | Mother and Child Health Coalition (www.mchc.net) | In English | → Gynaecology → Pediatry | 
| MCHC | Monthey-Chablais Hockey Club (www.mchc.ch) | In English | → Sport, physical exercises | 
| MCHC | Michigan Collegiate Hockey Conference | In English | → Sport, physical exercises | 
| MCHC | Muslim Cultural Heritage Centre | In English | → Museums | 
| MCHC | Moto Club Haute-Corrèze | In French | → Vehicle engineering | 
| MCL | Materials Center Leoben (www.mcl.at) | In English | → Research institutes → Materials science → Austria | 
| MCNV | Medisch Comité Nederland-Vietnam | In Dutch | → Medicine → Netherlands | 
| MČR | Svaz modelářů České Republiky | In Czech | → Entertainment | 
| MDLC | Museum Digital Licensing Consortium | In English | → Museums | 
| MDLC | Museum Digital Licensing Collective | In English | → Museums | 
| MDM | Médecins du Monde | In French | → Medicine | 
| MDRC | Mongolian Development Research Center | In English | → Research institutes → Development | 
| MEARC | Modern East Asia Research Centre | In English | → Research institutes → Area studies → Netherlands | 
| MEBA | Marine Engineers' Beneficial Association | In English | → Associations → 6295 | 
| MEBA | Michigan Elk Breeders Association | In English | → Associations → Agricultural sciences | 
| MEC | Miste En Corle | In Dutch | → Sport, physical exercises | 
| MEDEF | Mouvement des Entreprises de France | In French | → Economics | 
| MEDRC | Middle East Desalination Research Center (www.medrc.org) | In English | → Research institutes → Environmental technology, water supply, waste management → Chemical technology | 
| MEEREA | Malta Energy Efficiency & Renewable Energies Association | In English | → Associations → Energy economics → Malta | 
| MEF | Malaysian Employers Federation | In English | → Labour, labour economics | 
| MEF | Middle East Forum | In English | → Area studies | 
| MEF | Mount Everest Foundation | In English | → Foundations | 
| MEJ | Mouvement Eucharistique des Jeunes = MEJ | Movimiento Eucaristico Juvenil | In Spanish | In French | → Christianity | 
| MEJ | Movimiento Eucaristico Juvenil = (look above) | In Spanish | → Christianity | 
| MEKARO | MezKanada Renkontiĝo de Esperanto | In Esperanto | → Congresses → Artificial languages (linguistics) → Canada | 
| MEL | Muzika Esperanto Ligo | In Esperanto | → Music → Artificial languages (linguistics) | 
| MELC | Mechanical Engineering Liaison Committee | In English | → Mechanical engineering | 
| MEM | Middle East Medievalists | In English | → History | 
| MEM | Mondpaca Esperantista Movado | In Esperanto | → Politics → Artificial languages (linguistics) | 
| MEM | Movimento de Escola Moderna | In Portuguese | → Education | 
| MEMCH | Movimiento Pro-Emancipación de las Mujeres de Chile | In Spanish | → Feminism | 
| MEMO | Montreal Esperanto Movement = MEMO | Mouvement Espéranto-Montréal | In French = MEMO | Montreala Esperanta Movado | In Esperanto | In English | → Artificial languages (linguistics) → Canada | 
| MEMO | Mouvement Espéranto-Montréal = (look above) | In French | → Artificial languages (linguistics) → Canada | 
| MEMO | Montreala Esperanta Movado = (look above) | In Esperanto | → Artificial languages (linguistics) → Canada | 
| MEMRI | Middle East Media Research Institute | In English | → Research institutes → Newspapers, journalism | 
| MENARG | Middle East and North Africa Research Group | In English | → Social sciences → Area studies | 
| MERIT | Maastricht Economic Research Institute on Innovation and Technology | In English | → Research institutes → Economics → Research policy → Engineering, technology | 
| MERL | Materials Engineering Research Laboratory | In English | → Research institutes → Materials science | 
| MESA | Middle East Studies Association | In English | → Associations → Area studies | 
| MESARC | Middle East & South Asia Research Cluster | In English | → Research policy | 
| MESZ | Magyarországi Eszperantó Szövetség = HEA | Hungara Esperanto-Asocio | In Esperanto | In Hungarian | → Associations → Artificial languages (linguistics) → Hungary | 
| METO | Moed En Training Overwint | In Dutch | → Sport, physical exercises | 
| MEVMA | Maine Veterinary Medical Association (www.mainevetmed.org) | In English | → Associations → Veterinary medicine → United States | 
| MEVO | Met Enige Vrienden Opgericht | In Dutch | → Sport, physical exercises | 
| MFC | Maastrichtse Football Club | In Dutch | → Football and rugby | 
| MFC | Medemblikker Football Club | In Dutch | → Football and rugby | 
| MFEA | Museum of Far Eastern Antiquities | In English | → Museums → Archeology → History | 
| MFG | Medien- und Filmgesellschaft (www.mfg.de) | In German | → Research policy → Computer science → Telecommunications | 
| MFPA | Manitoba Food Processors Association | In English | → Associations → Food technology → Canada | 
| MFPA | Michigan Forestry and Park Association | In English | → Associations → Forestry | 
| MFPA | Minnesota Free Paper Association | In English | → Associations → Paper and board industry → United States | 
| MFPA | Malaysian Fire Protection Association | In English | → Associations | 
| MFQ | Mouvement Français pour la Qualité | In French | → Quality management → France | 
| MGS | Met Grote Snelheid | In Dutch | → Sport, physical exercises | 
| MGSA | Modern Greek Studies Association | In English | → Associations → Linguistics | 
| MH | Museum Helveticum | In Latin | → Museums → Switzerland | 
| MHA | Mormon History Association | In English | → Associations → Christianity → History | 
| MHD | Maria Hoop Diergaarde | In Dutch | → Sport, physical exercises | 
| MHG | Moscow Helsinki Group | In English | → Fundamental rights | 
| MHLA | Maritimes Health Libraries Association = ABSM | Association des Bibliothèques de la Santé des Maritimes | In French | In English | → Libraries → Associations → Medicine → 6295 | 
| MHP | Vakcentrale voor Middelbaar en Hoger Personeel | In Dutch | → Labour, labour economics |