| INRS | Institut National de Recherche et de Sécurité | In French | → Research institutes |
| INSA | Institut National des Sciences Appliquées | In French | → Applied sciences, technology |
| INSEA | Institut National de Statistique et d'Économie Appliquée | In French | → Specialized or (poly)technical colleges → Economics |
| INSEE | Institut National de la Statistique et des Études Économiques | In French | → Social sciences |
| INSERM | Institut National de la Santé et de la Recherche Médicale | In French | → Medicine |
| INSERR | Institut National de Sécurité Routière et de Recherche | In French | → Transport and postal services |
| INSET | Institut National Supérieur de l'Enseignement Technique | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| INSP | Institut des Nanosciences de Paris | In French | → Research institutes → Physics → Chemistry |
| INSPQ | Institut National de Santé Publique du Québec | In French | → Public health and hygiene |
| INSTM | Institut National des Sciences et des Techniques Nucléaires | In French | → Research institutes → Nuclear, atomic, and molecular physics → Nuclear technology |
| INSU | Institut National des Sciences de l'Univers | In French | → Astronomy → Earth sciences |
| INTEC | Institut National des Techniques Économiques et Comptables | In French | → Accounting |
| INTPM | Institut National de Formation de Techniciens Supérieurs des Travaux Publics - Mostganem | In French | → Specialized or (poly)technical colleges → Civil engineering |
| INTPO | Institut National de Formation de Techniciens Supérieurs des Travaux Publics - Ouargla | In French | → Specialized or (poly)technical colleges → Civil engineering |
| INVS | Institut National de Veille Sanitaire | In French | → Medicine |
| IOLS | Infrastructures et Outils Logiciels pour la Simulation | In French | → Computer science |
| IOT | Intubation Orotrachéale | In French | → Medicine |
| IPA | Instrument de Pré-Adhésion | In French | → European Union |
| IPAG | Institut de Préparation à l'Administration Générale | In French | → Public administration, government → Education |
| IPB | Institut Pierre Becker | In French | → Modern spiritual movements |
| IPB | Imprimerie Papeterie Boudard | In French | → Graphic industries, printing, publishing |
| IPC | Institut Polytechnique de Conakry | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| IPC | Institut de Pathologie du Cheval | In French | → Research institutes → Veterinary medicine → Agricultural sciences |
| IPCMS | Institut de Physique et de Chimie Moléculaire de Strasbourg | In French | → Physics → Chemistry → Biochemistry, biophysics |
| IPE | Ingénierie du Parc en Exploitation | In French | → Electrical engineering |
| IPER | Institut Portuaire d'Études et de Recherche | In French | → Transport and postal services |
| IPEV | Institut Paul-Émile Victor | In French | → Earth sciences |
| IPF | Internet pour la France | In French | → Internet → Organizations and associations → Telecommunications |
| IPGP | Institut de Physique du Globe de Paris | In French | → Earth sciences |
| IPJ | Institut Pratique de Journalisme | In French | → Specialized or (poly)technical colleges → Newspapers, journalism |
| IPL | Institut Pasteur de Lille (www.pasteur-lille.fr) | In French | → Biological sciences → Medicine |
| IPS | Institut Paul Scherrer |
In French | → Mathematics and natural sciences → Applied sciences, technology |
| IPSA | Institut Polytechnique des Sciences Avancées | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| IPSI | Institut für Integrierte Publikations- und Informationssysteme | In French | → Computer science → Knowledge management |
| IPSN | Institut de Protection et de Sûreté Nucléaire | In French | → Nuclear technology |
| IPTL | Institut Pédagogique Transport Logistique | In French | → Maintenance and logistics → Transport and postal services |
| IRA | Institut Régional d'Administration | In French | → Public administration, government → Education |
| IRAM | Institut de Radioastronomie Millimétrique | In French | → Research institutes → Astronomy |
| IRASEC | Institut de Recherche sur l'Asie du Sud-Est Contemporaine | In French | → Area studies |
| IRCAD | Institut de Recherche contre les Cancers de l'Appareil Digestif | In French | → Oncology |
| IRCAM | Institut de Recherche et Coordination Acoustique/Musique (www.ircam.fr) | In French | → Research institutes → Music |
| IRCANTEC | Institution de Retraite Complémentaire des Agents Non Titulaires de l’État et des Collectivités locales | In French | → Labour, labour economics → Insurance |
| IRCCyN | Institut de Recherche en Communications et Cybernétique de Nantes (www.irccyn.ec-nantes.fr) | In French | → Research institutes → Telecommunications → Electronics |
| IRCOBI | International Research COmmittee on Biokinetics of Impact | In French | → Transport and postal services |
| IRCOM | Institut des relations publiques et de la communication | In French | → Higher education, universities → 659 |
| IRD | Institut de Recherche pour le Développement | In French | → Development |
| IREM | Institut de Recherches sur l'Enseignement des Mathématiques | In French | → Research institutes → Education → Mathematics |
| IREP | Institut de Recherches et d'Études Publicitaires | In French | → 6591 |
| IRES | Institut de Recherches Économiques et Sociales | In French | → Research institutes → Social sciences → Economics |
| IRESCO | Institut de Recherche Européen en Sociologie et Socio-économie | In French | → Research institutes → Sociology → Economics |
| IRESCO | Institut de Recherche sur les Sociétés Contemporaines | In French | → Research institutes → Sociology |
| IRESP | Institut de Recherche en Santé Publique | In French | → Pharmacology, toxicology |
| IREX | Institut pour la Recherche appliquée et l'EXpérimentation en génie civil | In French | → Civil engineering |
| IRI | Institut de Recherche et d'Innovation (www.iri.centrepompidou.fr) | In French | → Research institutes → Research policy → Civilization, culture, progress |
| IRIS | Imaginons un Réseau Internet Solidaire | In French | → Internet → Organizations and associations |
| IRIS | Indexation et Reconnaissance d’Images par la Sémantique | In French | → Computer-based techniques → Semiotics |
| IRIT | Institut de Recherche Informatique de Toulouse (www.irit.fr) | In French | → Research institutes → Computer science |
| IRIT | Institut de Recherche en Informatique de Toulouse | In French | → Research institutes → Computer science |
| IRM | Imagerie par Résonance Magnétique = MRI | Magnetic Resonance Imagery | In English |
In French | → Medicine → Nuclear, atomic, and molecular physics |
| IRM | Institut Royal Météorologique de Belgique = KMI | Koninklijk Meteorologisch Instituut | In Dutch |
In French | → Meteorology, climatology |
| IRM | Idéale Résidence Mobile | In French | → Building |
| IRMB | Institut Royal Météorologique de Belgique | In French | → Meteorology, climatology |
| IRMBP | Institut Royal Météorologique de Belgique, Publications | In French | → Serial publications, periodicals → Meteorology, climatology |
| IRPI | Institut de Recherche en Propriété Intellectuelle (www.irpi.ccip.fr) | In French | → Research institutes → Artistic property |
| IRRMA | Institut Romand de Recherche Numérique en Physique de Matériaux | In French | → Computer simulation → Physics |
| IRSC | Instituts de recherche en santé du Canada (www.cihr.ca) = CIHR | Canadian Institutes of Health Research | In English |
In French | → Research institutes → Biological sciences → Medicine |
| IRSN | Institut de Radioprotection et de Sécurité Nucléaire | In French | → Research institutes → Nuclear technology |
| IRSST | Institut de recherche Robert-Sauvé en santé et sécurité du travail | In French | |
| IRT | Insuffisance Rénale Terminale | In French | → Physiology → Pathology |
| ISA | Institut Supérieur de l'Administration | In French | → Public administration, government → Higher education, universities |
| ISA | Institut Supérieur d'Agriculture | In French | → Agricultural sciences |
| ISA | Information Spatiale et Archéologie | In French | → Geodesy, cartography → Archeology |
| ISAE | Institut Supérieur de l'Aéronautique et de l'Espace (www.isae.fr) | In French | → Specialized or (poly)technical colleges → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ISAE | Institut des Sciences Appliquées et Économiques | In French | → Specialized or (poly)technical colleges → Economics |
| ISBL | Institution(s) sans but lucratif | In French | → Organizations and associations |
| ISBLSM | Institutions Sans But Lucratif au Service des Ménages | In French | |
| ISC | Institut des Sciences Cognitives | In French | → Biological sciences → Neurology |
| ISCAE | Institut Supérieur de Commerce et d'Administration des Entreprises | In French | → Management → Higher education, universities |
| ISCN | Institut de Chimie des Substances Naturelles | In French | → Chemistry → Chemical technology |
| ISCOM | Institut Supérieur de Communication et Publicité | In French | → Higher education, universities → 659 |
| ISCPA | Institut Supérieur de la Communication, de la Presse et de l'Audiovisuel | In French | → Newspapers, journalism → Higher education, universities → 659 → Arts |
| ISE | Institut Syndical Européen | In French | → Organizations and associations → Labour, labour economics |
| ISEM | Institut des Sciences de l'Évolution de Montpellier | In French | → Research institutes → Biological sciences |
| ISEN | Institut Supérieur d'Électronique et du Numérique | In French | → Computer-based techniques → Electronics |
| ISEP | Institut Supérieur d’Électronique de Paris | In French | → Specialized or (poly)technical colleges → Electronics |
| ISF | Impôt Sur la Fortune | In French | → Taxes, duties |
| ISF | Ingénieurs Sans Frontières | In French | → Organizations and associations → Engineering, technology |
| ISFOTEG | Institut Supérieur de Formation aux Techniques de Gestion | In French | → Economics → Higher education, universities |
| ISGC | Institut Supérieur de Gestion et de Commerce | In French | → Economics → Higher education, universities |
| ISH | Institut des Sciences de l'Homme | In French | |
| ISIAM | Institut Supérieur d'Informatique Appliquée et de Management | In French | → Economics → Higher education, universities |
| ISIC | Institut Supérieur de l'Information et de la Communication | In French | → Economics → Higher education, universities |
| ISIDORE | Internet et Santé | In French | |
| ISIMA | Institut Supérieur d'Informatique, de Modélisation et de leurs Applications | In French | → Computer science → Computer-based techniques |
| ISIR | Institut des Systèmes Intelligents et Robotique | In French | → Research institutes → Mechanical engineering → Electronics |
| ISIR | Institut des Systèmes Intelligents et de Robotique | In French | → Research institutes → Artificial intelligence → Electrical engineering → Engineering, technology |
| ISIS | Ingénierie des Systèmes d'Information et de Sécurité | In French | → Computer science → Telecommunications |
| ISL | Institut de Sondages Lavialle | In French | → Statistics |
| ISM | Institut Supérieur Maritime | In French | → Specialized or (poly)technical colleges → Marine research, oceanography → 627 → Vehicle engineering |
| ISMP | Institut Supérieur de Management Public | In French | → Management → Public administration, government |
| ISNHB | Institut des Sciences de la Nature - Université des Sciences et de la Technologie Haouari Boumediene | In French | → Higher education, universities |
| ISPA | Instrument Structurel de Préadhésion | In French | → International relations → European Union |
| ISPL | Institut Pierre-Simon Laplace (des Sciences de l'Environnement Global) | In French | → Environment, environmental sciences |
| ISS | Incident Significatif de Sûreté | In French | → Nuclear technology |
| ISST | Institut de Santé et de Sécurité au Travail | In French | → Labour, labour economics → Medicine |
| ISST | Institut des Sciences Sociales du Travail | In French | → Labour, labour economics → Sociology |
| IST | Information Scientifique et Technique | In French | → Mathematics and natural sciences → Applied sciences, technology |
| ISTA | Institut Supérieur Textile d'Alsace | In French | → Specialized or (poly)technical colleges → Textile industry |
| ISTA | Institut Supérieur de Technologie d'Antananarivo | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ISTAB | Institut Supérieur des Techniques Appliquées d'Ébonda | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ISTAK | Institut Supérieur des Techniques Appliquées de Kinshasa | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ISTC | Institut des Stratégies et Techniques de Communication | In French | → Higher education, universities → 659 |
| ISTCS | Institut Supérieur de Technologie Chimique de Sofia | In French | → Specialized or (poly)technical colleges → Chemical technology |
| ISTED | Institut des Sciences et des Techniques de l'Environnement pour le Développement | In French | → Nature → Agricultural sciences |
| ISTG | Institut Supérieur Technique de Gabé | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ISTG | Institut Supérieur Technique de Gabés | In French | → Higher education, universities |
| ISTHB | Institut des Sciences de la Terre - Université des Sciences et de la Technologie Haouari Boumediene | In French | → Higher education, universities → Earth sciences |
| ISTIA | Institut des Sciences et Techniques de l'Ingénieur d'Angers | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ISTIM | Institut Supérieur Technologique des Industries et des Mines de Gafsa | In French | → Specialized or (poly)technical colleges → Mining |
| ISTK | Institut Supérieur du Textile de Ksar Hellal | In French | → Specialized or (poly)technical colleges → Textile industry |
| ISTN | Institut Supérieur de Technologie de Nabeul | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ISTS | Institut Supérieur de Technologie d'Antsiranana | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ITA | Ingénieurs, Techniciens, Administratifs | In French | → Labour, labour economics → Engineering, technology |
| ITAF | Institut des Techniques Administratives et Financières | In French | → Economics → Finance → Accounting |
| ITAV | Institut des Technologies Avancées des Sciences du Vivant | In French | → Biological sciences → Biotechnology → Medicine |
| ITB | Institut pour le Transport par Batellerie = ITB | Instituut voor het Transport langs de Binnenwateren | In Dutch |
In French | → 6295 → Transport and postal services |
| ITC | Institut de Technologie du Cambodge | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| ITECH | Institut Textile et Chimique | In French | → Specialized or (poly)technical colleges → Chemical technology → Leather industry → Textile industry |
| ITF | Institut de Technologie du Froid | In French | → Specialized or (poly)technical colleges |
| 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 |
| ITS | Institut de Traitement des Signaux | In French | → Computer-based techniques → Telecommunications |
| IUEM | Institut Universitaire Européen de la Mer | In French | → Marine research, oceanography |
| IUFM | Institut Universitaire de Formations des Maîtres | In French | → Education |
| IUP | Institut Universitaire Professionnalisé | In French | → Specialized or (poly)technical colleges → Higher education, universities |
| IUT | Institut Universitaire de Technologie | In French | → Higher education, universities → Engineering, technology |
| 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 |
| JAco | Journal d'Acoustique | In French | → Serial publications, periodicals → Acoustics |
| JAF | Journal des Astronomes Francais | In French | → Serial publications, periodicals → Astronomy |
| 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 | → Political parties and movements |
| 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 |
| 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 |
| 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 → 531 |
| JMecA | Journal de Mécanique Appliquée | In French | → Serial publications, periodicals → 531 → Mechanical engineering |
| JMecT | Journal de Mécanique Théorique et Appliquéee | In French | → Serial publications, periodicals → 531 → Mechanical engineering |
| 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 → 531 → Mechanical engineering |
| JNE | Journées Nationales de l'Épilepsie | In French | → Neurology |
| JO | Journal Officiel | In French | → Serial publications, periodicals |
| JO | Jeux Olympiques | In French | → Sport, physical exercises |
| JO | Journal des Observateurs | In French | → Serial publications, periodicals → Astronomy |
| 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 |
| JReAt | Journal de Recherches Atmosphériques | In French | → Serial publications, periodicals → Meteorology, climatology |
| JSA | Journal de la Société des Américanistes | In French | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| JSA | Journal de la Société des Africanistes | In French | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| JSK | Jeunesse Sportive de Kabylie | In French | → Organizations and associations → Sport, physical exercises |
| 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 | LO = 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 |
| KHPM | Kininogène de Haut Poids Moléculaire | In French | → Biochemistry, biophysics |
| KML | Keyhole Markup Language | In French | → Programming languages |
| 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 |
| 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 |
| LACE | Laboratoire d'Application de la Chimie à l'Environnement | In French | → Research institutes → Nature → Environment, environmental sciences → 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 |
| LAEPSI | Laboratoire d'Analyse Environnementale des Procédés et des Systèmes Industriels | In French | → Research institutes → Nature → Environmental technology, water supply, waste management |
| LAFORIA | LAboratoire FORmes et Intelligence Artificielle | In French | → Research institutes → Artificial intelligence |
| LAI | Laboratoire d'Automatique Industrielle | In French | → Research institutes → Mechanical engineering |
| LAL | Leucémie Aiguë Lymphoïde | In French | → Blood and circulatory system → Pathology |
| LAM | Leucémie Aiguë Myéloïde | In French | → Blood and circulatory system → Pathology |
| LAM | Leucémie Aiguë à Mégacaryocytes | In French | → Blood and circulatory system → Pathology |
| LAMCOS | Laboratoire de Mécanique des Contacts et des Solides | In French | → Research institutes → 531 |
| 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 |
| 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 |
| LAPP | Laboratoire d’Annecy-le-Vieux de Physique des Particules | In French | → Research institutes → Nuclear, atomic, and molecular physics |
| LAREG | Laboratoire de Recherche en Géodésie | In French | → Research institutes → Geodesy, cartography |