

| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| ITI | Interface de Télécommande d'Interrupteur | In French | → Electrical engineering | 
| ITII | Institut des Techniques d’Ingénieur de l'Industrie (www.itiibourgogne.com) | In French | → Specialized or polytechnical colleges | 
| ITIL | Information Technology Infrastructure Library | In French | → Computer science | 
| ITM | Institut de Médecine Tropicale d'Anvers (www.itg.be) = ITG | Instituut voor Tropische Geneeskunde Antwerpen | In Dutch = IMT | Institute of Tropical Medicine in Antwerp | In English | In French | → Research institutes → Pathology → Belgium | 
| ITMI | Industrie et Technologie de la Machine Intelligente | In French | → Mechanical engineering → Artificial intelligence | 
| ITO | Institut des Technologies Océaniques = IOT | Institute for Ocean Technology | In English | In French | → Marine research, oceanography | 
| ITP | Institut de Théorie des Phénomènes Physiques | In French | → Physics | 
| ITPE | Ingénieur des Travaux Publics de l'État | In French | → Central administration → Civil engineering | 
| ITPM | Institut de Technologie des Pêches Maritimes | In French | → Specialized or polytechnical colleges → Fishing, hunting | 
| ITS | Institut de Traitement des Signaux | In French | → Computer-based techniques → Telecommunications | 
| ITSGRT | Institut des Techniciens Spécialisés en Génie Rural et Topographie de Meknès | In French | → Specialized or polytechnical colleges → Agricultural sciences | 
| ITSS | Infection Transmissible Sexuellement et par le Sang | In French | → Infectious diseases → Gynaecology | 
| ITST | Instruction de Travail Sous Tension | In French | → Electrical engineering | 
| ITT | Incapacité Temporaire de Travail | In French | → Pathology → Labour, labour economics | 
| IUEM | Institut Universitaire Européen de la Mer | In French | → Marine research, oceanography | 
| IUFM | Institut Universitaire de Formations des Maîtres | In French | → Education | 
| IUG | Intervention d'Urgence Gaz | In French | → Energy economics | 
| IUP | Institut Universitaire Professionnalisé | In French | → Specialized or polytechnical colleges → Higher education, universities | 
| IUT | Institut Universitaire de Technologie | In French | → Specialized or polytechnical colleges → Higher education, universities | 
| IVD | Invalidité, Vieillesse, Décès | In French | → Labour, labour economics | 
| IVG | Interruption Volontaire de Grossesse | In French | → Gynaecology, obstetrics | 
| IVI | Invitation à la vie | In French | → Christianity → Modern spiritual movements | 
| IVS | Institut des Vaisseaux et du Sang (www.ivs-vbi.org) = VBI | Vessels and Blood Institute | In English | In French | → Research institutes → Blood and circulatory system | 
| J2ME | Java 2 Micro Edition | In French | → Programming languages | 
| JA | Journal Asiatique | In French | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history | 
| JAC | Journée d'Acquisition des Connaissances | In French | → Knowledge management | 
| JAC | Jeunesse Anarchiste Communiste | In French | → Organizations and associations → Anarchist organizations → Communist parties | 
| JAco | Journal d'Acoustique | In French | → Serial publications, periodicals → Acoustics | 
| JAF | Journal des Astronomes Français | In French | → Serial publications, periodicals → Astronomy → France | 
| JAI | Justice et Affaires Intérieures | In French | → Law, jurisprudence → Police → 339932 | 
| JAMC | Journal de l'Association Médicale Canadienne (www.cmaj.ca/jamc/) | In French | → Serial publications, periodicals → Medicine → Canada | 
| JBiBi | Journal de Biophysique et de Biomécanique | In French | → Serial publications, periodicals → Biochemistry, biophysics | 
| JBMN | Journal de Biophysique et Médecine Nucléaire | In French | → Serial publications, periodicals → Biochemistry, biophysics → Medicine | 
| JC | Jeunesse Communiste | In French | → Communist parties | 
| JC | Jeune Cadre | In French | → Personnel management | 
| JCCM | Jeune Chambre de commerce de la Mauricie | In French | → Trade | 
| JCP | Journal de Chimie Physique | In French | → Serial publications, periodicals → Physical chemistry | 
| JCPA | Journées Cumulées en Présence d'Antigène | In French | → Pharmacology, toxicology | 
| JCPPC | Journal de Chimie Physique et de Physico-Chimie Biologique | In French | → Serial publications, periodicals → Physical chemistry → Biochemistry, biophysics | 
| JCR | Jeune Cadre Remarqué | In French | → Personnel management | 
| JDD | Jonction Double Dérivation | In French | → Electrical engineering | 
| JDDI | Jonction Double Dérivation Injectée | In French | → Electrical engineering | 
| JDE | Journal des Enfants | In French | → Newspapers, journalism → Education | 
| JE | Jeune Équipe | In French | → Research policy | 
| JEA | Jeux et Animations | In French | |
| JEI | Jeune Entreprise Innovante | In French | → 3384 → 650115 | 
| JFP | Journal de Frais de Personnel | In French | → Personnel management → Accounting | 
| JHM | Journal de la Haute-Marne (www.jhm.fr) | In French | → Newspapers, journalism | 
| JINS | Jeune Info Narbonne Service | In French | |
| JLS | Justice, Liberté et Sécurité | In French | → Politics | 
| JME | (Le) Journal de Maths des Élèves | In French | → Serial publications, periodicals → Mathematics → Higher education, universities | 
| JMec | Journal de Mécanique | In French | → Serial publications, periodicals → Mechanics | 
| JMecA | Journal de Mécanique Appliquée | In French | → Serial publications, periodicals → Mechanics → Mechanical engineering | 
| JMecT | Journal de Mécanique Théorique et Appliquéee | In French | → Serial publications, periodicals → Mechanics → Mechanical engineering | 
| JMJ | Journées Mondiales de la Jeunesse | In French | → Roman catholic church | 
| JMM | Journée Missionnaire Mondiale | In French | → Religion, theology | 
| JMNB | Journal de Médecine Nucléaire et Biophysique | In French | → Serial publications, periodicals → Biochemistry, biophysics → Medicine | 
| JMTAS | Journal de Mécanique Théorique et Appliquée - Supplément | In French | → Serial publications, periodicals → Mechanics → Mechanical engineering | 
| JNE | Journées Nationales de l'Épilepsie | In French | → Neurology | 
| JNT | Journée Non Travaillée | In French | → Personnel management | 
| JO | Jeux Olympiques | In French | → Sport, physical exercises | 
| JO | Journal des Observateurs | In French | → Serial publications, periodicals → Astronomy | 
| JO | Journal Officiel | In French | → Serial publications, periodicals | 
| JOCE | Journal Officiel des Communautés Européennes | In French | → Serial publications, periodicals → European Union | 
| JOp | Journal d'Optique | In French | → Serial publications, periodicals → Optics | 
| JPhys | Journal de Physique | In French | → Serial publications, periodicals → Physics | 
| JPI | Justice Pénale  Internationale = ICJ | International Criminal Justice | In English | In French | → International law | 
| JReAt | Journal de Recherches Atmosphériques | In French | → Serial publications, periodicals → Meteorology, climatology | 
| JRO | Journées de Recherche en Ophtalmologie | In French | → Ophthalmology | 
| JSA | Journal de la Société des Africanistes | In French | → Serial publications, periodicals → Area studies | 
| JSA | Journal de la Société des Américanistes | In French | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history | 
| JSK | Jeunesse Sportive de Kabylie | In French | → Organizations and associations → Sport, physical exercises | 
| JSP | Jeune Sapeur-Pompier | In French | → Firefighting | 
| JT | Journal Télévisé | In French | → Newspapers, journalism → Telecommunications | 
| JTM | Jeunes à Travers le Monde (www.international-jtm.com) | In French | → Organizations and associations | 
| JTS | Jeune Technicien Supérieur | In French | → Specialized or polytechnical colleges | 
| JV | Juste Valeur | In French | |
| K | Lysine = K | Lysine | In English = K | ليسين | In Arabic = K | লাইসিন | In Bengali = K | Lisina | In Catalan = K | Lysin | In Czech = K | Lysin | In German = K | Lisina | In Spanish = K | Lizino | In Laotian = K | 리신 | In Korean = K | Lizin | In Croatian = K | Lisin | In Indonesian = K | Lisina | In Italian = K | ליזין | In Hebrew = K | Lizīns | In Latvian = K | Lysin | In Letzeburgesh = K | Lizinas | In Lithuanian = K | Lizin | In Hungarian = K | Lysine | In Dutch = K | リシン | In Japanese = K | Lizyna | In Polish = K | Lisina | In Portuguese = K | Лизин | In Russian = K | Lysiini | In Finnish = K | Lizin | In Turkish = K | Лізин | In Ukrainian = K | 赖氨酸 | In Chinese | In French | → Biochemistry, biophysics | 
| K | Potassium = K | Potassium | In English = K | Kalium | In Afrikaans = K | بوتاسيوم | In Arabic = K | Potasiu | In Asturian = K | পটাশিয়াম | In Bengali = K | Калій | In Belarusian = K | Kalijum | In Bosnian = K | Калий | In Bulgarian = K | Potassi | In Catalan = K | Draslík | In Czech = K | Potassiu | In Corsican = K | Potasiwm | In Welsh = K | Kalium | In Danish = K | Kalium | In German = K | ޕޮޓޭސިއަމް | In Dhivehi = K | Kaalium | In Estonian = K | Κάλιο | In Greek = K | Potasio | In Spanish = K | Kalio | In Esperanto = K | Potasio | In Basque = K | پتاسیم | In Persian = K | Potassi | In Friulian = K | Potaisiam | In Irish = K | Potashum | In Manx = K | Potasio | In Galician = K | 칼륨 | In Korean = K | Կալիում | In Armenian = K | पोटासियम | In Hindi = K | Kalij | In Croatian = K | Kalio | In Ido = K | Kalium | In Indonesian = K | Kalín | In Icelandic = K | Potassio | In Italian = K | אשלגן | In Hebrew = K | Kalium | JV = K | ಪೊಟ್ಯಾಶಿಯಮ್ | In Kannada = K | Kali | In Swahili = K | Potasyòm | In Haitian Creole = K | Qelye | In Kurdish = K | Kalium | In Latin = K | Kālijs | In Latvian = K | Kalium | In Letzeburgesh = K | Kalis | In Lithuanian = K | sodnrkali | In Lojban = K | Kálium | In Hungarian = K | Калиум | In Macedonian = K | പൊട്ടാസ്യം | In Malayalam = K | Konurehu | In Māori = K | Kalium | In Malay = K | Kalium | In Dutch = K | カリウム | In Japanese = K | Kalium | In Norwegian = K | Kalium | In Nynorsk = K | Kalium | NOV = K | Potassi | In Occitan = K | Kaliy | In Uzbek = K | Kalium | In Low German = K | Potas | In Polish = K | Potássio | In Portuguese = K | Potasiu | In Romanian = K | Kalyu | In Quechua = K | Калий | In Russian = K | Kaliumi | In Albanian = K | Putassiu | In Sicilian = K | Draslík | In Slovak = K | Kalij | In Slovenian = K | Калијум | In Serbian = K | Kalij | In Serbo-Croatian = K | Kalium | In Finnish = K | Kalium | In Swedish = K | โพแทสเซียม | In Thai = K | Kali | In Vietnamese = K | Калий | In Tajik = K | Potasyum | In Turkish = K | Калій | In Ukrainian = K | وٹاشیم | In Urdu = K | Potassiom | In Walloon = K | Kalium | In Vlaams = K | 钾 | In Chinese | In French | → Chemistry | 
| KCA | Kérato-Conjonctivite Atopique | In French | → Pathology → Ophthalmology | 
| KCV | Kérato-Conjonctivite Vernale | In French | → Pathology → Ophthalmology | 
| KHPM | Kininogène de Haut Poids Moléculaire | In French | → Biochemistry, biophysics | 
| KML | Keyhole Markup Language | In French | → Programming languages | 
| Kr | Krypton = Kr | Kripton | In Afrikaans = Kr | كريبتون | In Arabic = Kr | Крыптон | In Belarusian = Kr | Криптон | In Bulgarian = Kr | ক্রিপটন | In Bengali = Kr | Kripton | In Bosnian = Kr | Criptó | In Catalan = Kr | Kriptone | In Corsican = Kr | Krypton | In Czech = Kr | Криптон | In Chuvash = Kr | Crypton | In Welsh = Kr | Krypton | In Danish = Kr | Krypton | In German = Kr | Κρυπτό | In Greek = Kr | Krypton | In English = Kr | Kriptono | In Esperanto = Kr | Kriptón | In Spanish = Kr | Krüptoon | In Estonian = Kr | Kripton | In Basque = Kr | Krypton | In Finnish = Kr | Cripton | In Friulian = Kr | Crioptón | In Irish = Kr | Cripton | In Galician = Kr | Krypton | In Manx = Kr | קריפטון | In Hebrew = Kr | क्रिप्टन | In Hindi = Kr | Kripton | In Croatian = Kr | Kripton | In Haitian Creole = Kr | Kripton | In Hungarian = Kr | Կրիպտոն | In Armenian = Kr | Kripton | In Indonesian = Kr | Kriptono | In Ido = Kr | Krypton | In Icelandic = Kr | Kripton | In Italian = Kr | クリプトン | In Japanese = Kr | mipnavni | In Lojban = Kr | Kripton | JV = Kr | ಕ್ರಿಪ್ಟಾನ್ | In Kannada = Kr | 크립톤 | In Korean = Kr | Krypton | In Latin = Kr | Krypton | In Letzeburgesh = Kr | Krypton | In Limburgish = Kr | Kriptonas | In Lithuanian = Kr | Kriptons | In Latvian = Kr | ക്രിപ്റ്റണ് | In Malayalam = Kr | Kripton | In Malay = Kr | Krypton | In Low German = Kr | Krypton | In Dutch = Kr | Krypton | In Nynorsk = Kr | Krypton | In Norwegian = Kr | Cripton | In Occitan = Kr | Krypton | In Polish = Kr | Crípton | In Portuguese = Kr | Kriptun | In Quechua = Kr | Kripton | In Romanian = Kr | Криптон | In Russian = Kr | Kripton | In Sicilian = Kr | Kripton | In Serbo-Croatian = Kr | Kryptón | In Slovak = Kr | Kripton | In Slovenian = Kr | Криптон | In Serbian = Kr | Krypton | In Swedish = Kr | Kriptoni | In Swahili = Kr | கிருப்டான் | In Tamil = Kr | คริปทอน | In Thai = Kr | Kripton | In Turkish = Kr | Криптон | In Ukrainian = Kr | Kripton | In Uzbek = Kr | Krypton | In Vietnamese = Kr | 氪 | In Chinese | In French | → Chemistry | 
| L | Leucine = L | Leucine | In English = L | Leucina | In Catalan = L | Leucin | In Danish = L | Leucin | In German = L | Leucina | In Spanish = L | Leŭcino | In Esperanto = L | 류신 | In Korean = L | Leucin | In Croatian = L | Leusin | In Indonesian = L | Leucina | In Italian = L | לאוצין | In Hebrew = L | Leicīns | In Latvian = L | Leucin | In Letzeburgesh = L | Leucinas | In Lithuanian = L | Leucine | In Dutch = L | ロイシン | In Japanese = L | Leucin | In Norwegian = L | Leucyna | In Polish = L | Leucina | In Portuguese = L | Лейцин | In Russian = L | Leusiini | In Finnish = L | Leucin | In Swedish = L | Lösin | In Turkish = L | Лейцин | In Ukrainian = L | 亮氨酸 | In Chinese | In French | → Biochemistry, biophysics | 
| L1 | Ligue 1 | In French | → Football and rugby | 
| L2E | Laboratoire d'Électronique et Électromagnétisme | In French | → Research institutes → Electronics → Electromagnetism | 
| L2ES | Laboratoire de Recherche en Électronique, Électrotechnique et Systèmes | In French | → Research institutes → Electrical engineering → Electronics | 
| LA | Leucémie Aiguë | In French | → Blood and circulatory system → Pathology | 
| LAB | Laboratoire d'Accidentologie et de Biomécanique | In French | → Research institutes → Traumatology → Transport and postal services | 
| LaBRI | Laboratoire Bordelais de Recherche en Informatique (www.labri.fr) | In French | → Research institutes → Computer science | 
| LACCO | LAboratoire de Catalyse en Chimie Organique | In French | → Research institutes → Organic chemistry | 
| LACE | Laboratoire d'Application de la Chimie à l'Environnement | In French | → Research institutes → Environmental protection → Threats to the environment → Chemistry | 
| LACITO | Langues et Civilisations à Tradition Orale | In French | → Language, linguistics, literature | 
| LAD | Lecture Automatique de Documents | In French | → Document processing | 
| LADL | Laboratoire d'Automatisme Documentaire et Linguistique | In French | → Research institutes → Computer science → Libraries → Linguistics | 
| LADL | Laboratoire d'Automatique Documentaire et Linguistique | In French | → Research institutes → Documentation → Linguistics | 
| LAEPSI | Laboratoire d'Analyse Environnementale des Procédés et des Systèmes Industriels | In French | → Research institutes → Environmental protection → Environmental technology, water supply, waste management | 
| LAF | Lemovice Antifa Festival | In French | → Music | 
| LAFORIA | LAboratoire FORmes et Intelligence Artificielle | In French | → Research institutes → Artificial intelligence | 
| LAI | Laboratoire d'Automatique Industrielle | In French | → Research institutes → Mechanical engineering | 
| LAITUE | L'Association Interdoctorant en Terre Univers Environnement | In French | → Associations → Earth sciences → Astronomy → Threats to the environment | 
| LAL | Leucémie Aiguë Lymphoïde | In French | → Blood and circulatory system → Pathology | 
| LAL | Lysat d’Amébocytes de Limules | In French | → Diagnostics → Infectious diseases | 
| LAM | Leucémie Aiguë à Mégacaryocytes | In French | → Blood and circulatory system → Pathology | 
| LAM | Leucémie Aiguë Myéloïde | In French | → Blood and circulatory system → Pathology | 
| LAMCOS | Laboratoire de Mécanique des Contacts et des Solides | In French | → Research institutes → Mechanics | 
| LAME | Laboratoire Africain de Métrologie | In French | → Standardization → Quality management | 
| LAMFA | Laboratoire Amiénois de Mathématique Fondamentale et Appliquée | In French | → Research institutes → Mathematics | 
| LAMIH | Laboratoire d'Automatique et de Mécanique Industrielles et Humaines | In French | → Research institutes → Mechanical engineering | 
| LAMOP | LAboratoire de Médiévistique Occidentale de Paris | In French | → Research institutes → Language, linguistics, literature → History → France | 
| LAMSADE | Laboratoire d'Analyse et de Modélisation de Systèmes pour l'Aide à la DÉcision | In French | → Research institutes → Computer-based techniques → Management | 
| LaMSID | Laboratoire de Mécanique des Structures Industrielles Durables | In French | → Research institutes → Mechanical engineering | 
| LAN | Laboratoire d'Applications Numériques | In French | → Research institutes → Computer-based techniques | 
| LAPER | Logiciel d'Aide à la Planification de l'Électrification Rurale | In French | → Software → Electrical engineering | 
| LAPP | Laboratoire d'Annecy-le-Vieux de Physique des Particules | In French | → Research institutes → Nuclear, atomic, and molecular physics → France | 
| LAREG | Laboratoire de Recherche en Géodésie | In French | → Research institutes → Geodesy, cartography | 
| LARES | Laboratoire de Recherche en Sciences humaines et Sociales | In French | → Research institutes → Social sciences | 
| LASER | Mouvement de Liaison des Associations de SÉcurité Routière | In French | → Organizations and associations → Transport and postal services | 
| LASMAP | Laboratoire de Recherche Structure et Mécanique Appliquée | In French | → Research institutes → Mechanical engineering | 
| LASS | Laboratoire d'Analyse des Systèmes de Santé | In French | → Research institutes → Public health and hygiene | 
| LATERE | Loirénergie, Agence Technique pour une Énergie Respectueuse de l'Environnement | In French | → Energy economics | 
| LATTS | LAboratoire Techniques, Territoires et Sociétés | In French | → Research institutes → Sociology → Regional planning | 
| LAURA | Logiciel d'Aide à l'Utilisateur pour une Réflexion sur les Avancements | In French | → Software | 
| LAVIA | Limitateur s'Adaptant à la Vitesse Autorisée | In French | → Vehicle engineering → Transport and postal services | 
| LBB | Laboratoire Biotechnologie-Bioprocédés | In French | → Research institutes → Biotechnology | 
| LBC | Lampe Basse Consommation | In French | → Electrical engineering | 
| LBD | Laboratoire de Bases de Données | In French | → Research institutes → Data | 
| LBPAM | La Banque Postale Asset Management | In French | → Banks → Postal services → France | 
| LBPSAM | La Banque Postale Structured Asset Management | In French | → Banks → Postal services → France | 
| LBS | Laboratoire de Bioinorganique Structurale | In French | → Research institutes → Biochemistry, biophysics | 
| LCA | Liste des Contrôles d'Accès | In French | |
| LCC | Laboratoire de Chimie de Coordination | In French | → Research institutes → Chemistry | 
| LCD | Langage de Contrôle de Données = DCL | Data Control language | In English | In French | → Programming languages → Data | 
| LCL | Le Crédit Lyonnais (www.creditlyonnais.com) | In French | → Banks → France | 
| LCPC | Laboratoire Central des Ponts et Chaussées (www.lcpc.fr) | In French | → Research institutes → Civil engineering → France | 
| LCR | Ligue Communiste Révolutionnaire | In French | → Communist parties | 
| LCSR | Laboratoire de Combustion et Systèmes Réactifs | In French | → Research institutes | 
| LCT | Langage de Contrôle des Transactions = TCL | Transaction Control language | In English | In French | → Programming languages → Data | 
| LCVR | Ligue Contre la Violence Routière | In French | → Organizations and associations → Transport and postal services | 
| LDD | Langage de Description de Données | In French | → Data | 
| LDD | Langage de Définition de Données = DDL | Data Definition Language | In English | In French | → Programming languages → Data | 
| LDF | Ligue des Diabétiques de France (www.diabetenet.com) | In French | → Organizations and associations → Physiology → Pathology → France | 
| LDMR | Lance à Débit Mixte Réglable | In French | → Firefighting | 
| LDMS | Laboratoire de Dynamique des Machines et des Structures | In French | → Research institutes → Mechanics → Mechanical engineering | 
| LDT | Lance sur Dévidoir Tournant | In French | → Firefighting | 
| LDV | Lance à Débit Variable | In French | → Firefighting | 
| LEAD | Lupus Érythémateux Aigu Disséminé | In French | → Immunology and allergy → Pathology | 
| LEAT | Laboratoire d'Électronique, Antennes et Télécommunications | In French | → Research institutes → Electronics → Telecommunications | 
| LEBM | Laboratoire Européen de Biologie Moléculaire | In French | → Research institutes → Biochemistry, biophysics | 
| LECAP | Laboratoire d'Étude et de Commande Automatique de Processus | In French | → Research institutes → Mechanical engineering → Electronics | 
| LED | Lupus Érythémateux Disséminé | In French | → Pathology | 
| LEDSS | Laboratoire d'Études Dynamiques et Structurales de la Sélectivité | In French | → Research institutes → Chemistry → Biochemistry, biophysics | 
| LEEM | Les Entreprises du Médicament | In French | → Pharmacology, toxicology | 
| LEGI | Laboratoire d'Économie et de Gestion Industrielle | In French | → Research institutes → Economics → Industry, industrial policy | 
| LEGT | Lycée d'Enseignement Général et Technologique | In French | → Education | 
| LEGTA | Lycée d'Enseignement Général et Technologique Agricole | In French | → Specialized or polytechnical colleges → Agricultural sciences | 
| LEMA | Laboratoire d'Électrodynamique des Matériaux Avancés | In French | → Research institutes → Electricity, magnetism, electromagnetism → Materials science | 
| LEP | Large Electron Positron collider | In French | → Nuclear, atomic, and molecular physics | 
| LERec | L'Écho des Recherches | In French | → Serial publications, periodicals → Mathematics and natural sciences | 
| LES | Lupus Érythémateux Systémique = SLE | Systemic Lupus Erythematosus | In English | In French | → Immunology and allergy → Pathology | 
| LET | Laboratoire d'Économie des Transports | In French | → Research institutes → Economics → Transport and postal services | 
| LETI | Laboratoire d'Électronique et de Technologie de l'Informatique | In French | → Research institutes → Computer science → Electronics | 
| LEUP | Licence d'Études Universitaires Professionnalisées | In French | → Specialized or polytechnical colleges → Higher education, universities | 
| LFB | Laboratoire français du Fractionnement et des Biotechnologies (https://www.groupe-lfb.com) | In French | → Biotechnology → Pharmacology, toxicology → France | 
| LFB | Ligue Féminine de Basket (www.basketlfb.com) | In French | → Organizations and associations → Basketball | 
| LFB | Lycée Français de Barcelone (https://www.lfb.es) | In French | → Education → Spain | 
| LFB | Lycée Français de Budapest (http://http://lfb.hu/fr/) | In French | → Education → Hungary | 
| LFC | Lit Fluidisé Circulant | In French | → Applied sciences, technology | 
| LFCC | Laboratoire Franco-Chinois sur la Catalyse | In French | → Research institutes → Chemistry → Chemical technology | 
| LFCE | Ligue Française Contre l'Épilepsie (www.lfce-epilepsies.fr) | In French | → Organizations and associations → Neurology → France | 
| LFI | Loi de Finances Initiale | In French | → Politics → Public finance | 
| LFP | Ligue de Football Professionnel | In French | → Organizations and associations → Football and rugby | 
| LFP | Lycée Français de Prague (www.lfp.cz) | In French | → Education → Czech Republic | 
| LFP | Lycée Français de Pékin (www.lfp.com.cn) | In French | → Education | 
| LFP | La Française des Plastiques (www.lfp-sa.com) | In French | → Plastic industry → France | 
| LFR | Loi de Finances Rectificative | In French | → Politics → Public finance | 
| LGA | Lettre de Gestion Annuelle | In French | |
| LGE | Laboratoire de Géochimie des Eaux | In French | → Research institutes → Geochemistry → Hydrology | 
| LGE | Laboratoire de Génie Électrique | In French | → Research institutes → Electrical engineering | 
| LGEP | Laboratoire de Génie Électrique de Paris (www.lgep.supelec.fr) | In French | → Research institutes → Electrical engineering | 
| LGGE | Laboratoire de Glaciologie et Géophysique de l'Environnement | In French | → Research institutes → Earth sciences | 
| LGIT | Laboratoire de Géophysique Interne et de Tectonophysique | In French | → Research institutes → Geophysics → Seismology, earthquakes | 
| LGV | Ligne à Grande Vitesse | In French | → Transport and postal services | 
| LHBl | La Houille Blanche | In French | → Serial publications, periodicals → Mining | 
| LHC | Large Hadron Collider | In French | → Nuclear, atomic, and molecular physics | 
| LI3 | Laboratoire de recherche en Ingénierie Informatique Intelligente | In French | → Research institutes → Software → Artificial intelligence | 
| LIA | Laboratoire d'Informatique d'Avignon (www.lia.univ-avignon.fr) | In French | → Research institutes → Computer science → France | 
| LIA | Laboratoire d'Intelligence Artificielle | In French | → Research institutes → Artificial intelligence | 
| LIBER | Ligue des Bibliothèques Européennes de Recherche | In French | → Organizations and associations → Libraries → Research policy | 
| LICP | Ligue Internationale des Combattants de la Paix | In French | → Organizations and associations | 
| LICRA | Ligue Internationale Contre le Racisme et l'Antisémitisme | In French | → Organizations and associations → Fundamental rights | 
| LIDIC | Liaisons Informatiques entre Distributeurs et Constructeurs | In French | → Computer science | 
| LIE | Limite Inférieure d'Explosivité | In French | |
| LIEF | Ligue des Infirmiers et des Infirmières de l'Espace Francophone | In French | → Organizations and associations → Medicine | 
| LIEGE | Logiciel d'Interface des Enregistreurs Gaz Électroniques | In French | → Software → Energy economics | 
| LIEN | Lutte, Information, Études des infections Nosocomiales | In French | → Associations → Infectious diseases | 
| LIER | Laboratoire d'essais INRETS Équipements Routiers | In French | → Research institutes → Civil engineering → Transport and postal services | 
| LIF | Laboratoire d'Imagerie Fonctionnelle | In French | → Research institutes → Diagnostics | 
| LIFAR | Laboratoire d'Informatique Fondamentale et Appliquée de Rouen | In French | → Research institutes → Computer science |