| HEC | École des Hautes Études Commerciales | In French | → Higher education, universities → Economics |
| HECF | (École des) Hautes Études Comptables et Financières | In French | → Specialized or (poly)technical colleges → Finance → Accounting |
| HECI | Hautes Études Commerciales et Informatiques | In French | → Higher education, universities → Economics |
| HEEC | École des Hautes Études Économiques et Commerciales de Marrakech | In French | → Higher education, universities → Economics |
| HEGEL | Histoire, Enjeux Globaux, Écomobilité Locale | In French | → Transport and postal services |
| HEI | Hautes Études Industrielles | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| HEM | Institut des Hautes Études de Management | In French | → Management → Economics → Higher education, universities |
| HESSO | Haute École Spécialisée de Suisse Occidentale | In French | → Specialized or (poly)technical colleges |
| HGA | Histoire Générale de l'Afrique | In French | → Serial publications, periodicals → History |
| HQE | Haute Qualité Environnementale | In French | → Quality management → Nature and society → Environmental technology, water supply, waste management |
| HTA | Hypertension artérielle = АГ | Артериальная гипертензия | In Russian |
In French | → Physiology → Pathology |
| I | Isoleucine = I | Isoleucine | In English = I | Isoleucina | In Catalan = I | Isoleucin | In Danish = I | Isoleucin | In German = I | Isoleucina | In Spanish = I | Izoleŭcino | In Esperanto = I | 이소류신 | In Korean = I | Izoleucin | In Croatian = I | Isoleusin | In Indonesian = I | Isoleucina | In Italian = I | איזולאוצין | In Hebrew = I | Izoleicīns | In Latvian = I | Isoleucin | In Letzeburgesh = I | Izoleucinas | In Lithuanian = I | Isoleucine | In Dutch = I | イソロイシン | In Japanese = I | Izoleucyna | In Polish = I | Isoleucina | In Portuguese = I | Изолейцин | In Russian = I | Isoleusiini | In Finnish = I | Isoleucin | In Swedish = I | İzolösin | In Turkish = I | Ізолейцин | In Ukrainian = I | 異亮氨酸 | In Chinese |
In French | → Biochemistry, biophysics |
| I-STEM | Institut des Cellules Souches pour le Traitement et l'Étude des Maladies Monogéniques | In French | → Biotechnology → Medicine |
| I3C | Internet Créatif, Coopératif et Citoyen | In French | → Internet |
| I3S | (Laboratoire d')Informatique, Signaux et Systèmes de Sophia Antipolis | In French | → Research institutes → Computer science → Telecommunications |
| IA | Intelligence Artificielle = AI | Artificial Intelligence | In English = AI | Artificiële Intelligentie | In Dutch = KI | Kunstmatige Intelligentie | In Dutch = VI | Vještačka inteligencija | In Bosnian = IA | Intelligència artificial | In Catalan = KI | Künstliche Intelligenz | In German = AI | Artefarita Inteligenteco | In Esperanto |
In French | → Artificial intelligence |
| IAA | Industries Agricoles et Alimentaires | In French | → Agricultural sciences → Beverage industry → Food technology |
| IAC | Institut Agronomique néo-Calédonien | In French | → Agricultural sciences |
| IACO | International Aviation COnsulting | In French | → 359 → Aeronautics, aircraft |
| IADE | Infirmièr(e)-Anesthésiste Diplômé(e) d'État | In French | → Anesthesiology |
| IAE | Institut d'Administration des Entreprises | In French | → Management → Economics |
| IAI | Institut Africain d'Informatique | In French | → Specialized or (poly)technical colleges → Computer science |
| IALS | International Association of Literary Semantics | In French | → Associations → Literature |
| IANOR | Institut algérien de normalisation | In French | → Standardization |
| IAO | Institut d'Asie Orientale | In French | → Language, linguistics, literature → Geography, biography, history |
| IAO | Ingénierie Assistée par Ordinateur | In French | → Computer-based techniques → Engineering, technology |
| IAP | Institut Algérien du Pétrole | In French | → Specialized or (poly)technical colleges → Mining → 665 |
| IAPR | Institut d’Accompagnement Psychologique et de Ressources | In French | → Psychology |
| IAPS | Institut Auderghemois de Promotion Sociale | In French | |
| IAS | Interface d'Authentification Serveur | In French | → Networks, communication → Telecommunications |
| IAS | Identification, Authentification et Signature | In French | → Computer science → Telecommunications |
| IAURIF | Institut d'Aménagement et d'Urbanisme de la Région Île-de-France | In French | → Transport and postal services → Regional planning |
| IBISC | Informatique, Biologie Intégrative et Systèmes Complexes | In French | → Computer science → Biological sciences |
| IBL | Institut de Biologie de Lille | In French | → Research institutes → Biological sciences |
| IBN | Institut Belge de Normalisation = BNI | Belgisch Instituut voor Normalisatie | In Dutch |
In French | → Standardization |
| IBS | Institut de Biologie Structurale | In French | → Biochemistry, biophysics |
| IBTP | Institut des Bâtiments et des Travaux Publics | In French | → Specialized or (poly)technical colleges |
| ICA | Institut de Chimie de Annaba | In French | → Specialized or (poly)technical colleges → Chemical technology → Chemistry |
| ICA | Ingénieur du Contrôle Aérien | In French | → Aeronautics, aircraft → Transport and postal services |
| ICAD | Institut des Cadres Dirigeants | In French | → Specialized or (poly)technical colleges → Management |
| ICADTS | International Council on Alcohol and Traffic Safety | In French | → Organizations and associations → Medicine → Transport and postal services |
| ICALIN | Indicateur composite des activités de lutte contre les infections nosocomiales | In French | → Infectious diseases |
| ICAM | Institut Catholique d'Arts et Métiers | In French | → Roman catholic church → Specialized or (poly)technical colleges → Engineering, technology |
| ICAME | Innovation Commerciale, Analyse des Marchés et de leur Environnement | In French | |
| ICAR | Incubateur de Champagne-Ardenne (www.icar-incubateur.fr) | In French | → Engineering, technology |
| ICARE | Instrumentation, Commande et Architecture des Robots Évolués | In French | → Electronics |
| ICCOS | Infrastructures de Calcul, de COmmunications et Sécurité | In French | |
| ICD | Instrument de Coopération au Développement | In French | → European Union |
| ICEDD | Institut de Conseil et d'Études en Développement Durable | In French | |
| ICEM | Institut Coopératif de l'École Moderne | In French | → Education |
| ICES | International Council for Exploration of the Sea | In French | → Organizations and associations → Earth sciences → Zoology |
| ICI | Information, Coordination, Incitation | In French | → Computer science |
| ICI | Instrument de Coopération avec les pays Industrialisés | In French | → European Union |
| ICMS | Information, Communication, Modélisation et Simulation (www.polytechnicum.org/icms/) | In French | → Higher education, universities → Computer-based techniques |
| ICMS | Ingénierie et Contrôle des Matériaux et des Structures | In French | → 620 → Mechanical engineering |
| ICP | Institut Catholique de Paris | In French | → Roman catholic church → Education |
| ICP | Institut de la Communication Parlée | In French | → Language, linguistics, literature |
| ICPE | Installation Classée pour la Protection de l'Environnement | In French | → Nature |
| ICRA | Association de Classification du Contenu de l'Internet | In French | → Internet → Libraries → Associations |
| ICSI | Injection Intracytoplasmique du Spermatozoïde | In French | → Gynaecology |
| ICT | Institut Catholique de Toulouse | In French | → Roman catholic church → Specialized or (poly)technical colleges |
| ICTA | Instituts et Centres Techniques Agricoles | In French | → Research institutes → Agricultural sciences |
| ICTT | Interaction Collaborative, Télé-formation, Télé-activités | In French | → Human-computer interaction → Networks, communication → Education |
| ICV | Institut Cardiovasculaire | In French | → Cardiology |
| ID | Initiative Développement | In French | → Organizations and associations → Development |
| ID | Informatique Distribuée | In French | → Software → Networks, communication |
| IDATE | Institut de l'Audiovisuel et des Télécommunications en Europe | In French | → Cinema, movies → Telecommunications |
| IDE | Investissements Directs à l'Étranger | In French | → Finance |
| IDE | Investissement Direct à l'Étranger | In French | → Economics |
| IDEA | Inventer la Distribution Électrique de l'Avenir | In French | → Electrical engineering |
| IDEB | Institut de Développement Économique de la Bourgogne | In French | → Economics |
| IDÉE | Institut Des Épilepsies de l‘Enfant et de l‘Adolescent | In French | → Neurology → Pediatry |
| IDEMM | Ingénierie Documentaire, Édition et Médiation Multimédia | In French | → Document processing → Libraries → Graphic industries, printing, publishing |
| IDEMU | Institut de l'Écologie en Milieu Urbain | In French | → Environment, environmental sciences → Ecology |
| IDEO | Institut Dominicain d'Études Orientales du Caire | In French | → Research institutes → Roman catholic church → Area studies |
| IDH | Indice de Développement Humain = HDI | Human Development Index | In English = IHD | Indico de Homa Disvolviĝo | In Esperanto = IDH | Índex de Desenvolupament Humà | In Catalan |
In French | → Demography, statistics, sociology |
| IDIST | Formation et Recherche en Sciences de l'Information et du Document | In French | → Document processing → Knowledge management → Libraries |
| IDN | Institut Industriel du Nord | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| IDS | Initiative de Défense Stratégique | In French | → 355 |
| IE | Intelligence Économique | In French | |
| IEA | Ingénieur de l’Électronique Aéronautique | In French | → Electronics → Aeronautics, aircraft → Transport and postal services |
| IED | Innovation Énergie Développement | In French | → Energy economics |
| IEDN | Institut Européen de Distribution et de Négociation | In French | → Higher education, universities → Economics |
| IEE | Institut d'Études Européennes | In French | → Social sciences |
| IEMN | Institut d'Électronique et de Microélectronique du Nord | In French | → Electronics |
| IEMN | ÉInstitut d'Électronique, de Microélectronique et de Nanotechnologie | In French | → Electronics |
| IEP | Institut d'Études Politiques | In French | → Politics → Education |
| IER | Institut d'Économie Rurale | In French | → Economics |
| IERP | Institut d'Études Religieuses et Pastorales | In French | → Religion, theology |
| IES | Initiative Européenne et Sociale | In French | → Political parties and movements |
| IET | Institut Européen de Technologie | In French | → Engineering, technology |
| IEVP | Instrument Européen de Voisinage et de Partenariat | In French | → European Union |
| IFA | Impôt Forfaitaire Annuel | In French | → Taxes, duties |
| IFAT | Institut Français d'Analyse Transactionnelle | In French | → 15998 |
| IFCIC | Institut pour le Financement du Cinéma et des Industries Culturelles | In French | → Cinema, movies |
| IFEAC | Institut Français d'Études sur l'Asie Centrale | In French | → Research institutes → Area studies |
| IFEAD | Institut Français d'Études Arabes de Damas | In French | → Research institutes → Language, linguistics, literature → Geography, biography, history |
| IFEN | Institut Français de l'Environnement | In French | → Research institutes → Nature → Environment, environmental sciences |
| IFF | Interchange File Format | In French | → Data |
| IFFI | Institut Français du Froid Industriel et du génie climatique | In French | → Energy economics → Environmental technology, water supply, waste management |
| IFM | Institut Français de la Mer | In French | → Research institutes → Environment, environmental sciences → Marine research, oceanography |
| IFMA | Institut Français de Mécanique Avancée | In French | → Mechanical engineering |
| IFOP | Instrument Financier d'Orientation de la Pêche = FIAF | Finanzinstrument für die Ausrichtung der Fischerei | In German = SFOP | Strumento Finanziario di Orientamento della Pesca | In Italian = FIFG | Financial Instrument for Fisheries Guidance | In English = FFU | Fonden för Fiskets Utveckling | In Swedish |
In French | → Finance → European Union → Fishing, hunting |
| IFP | Institut Français du Pétrole | In French | → Research institutes → Earth sciences → Mining → 665 |
| IFP | Institut Français de Presse | In French | → Specialized or (poly)technical colleges → Newspapers, journalism |
| IFPCC | Institut Français des Praticiens des Procédures Collectives | In French | → Organizations and associations → Law, jurisprudence |
| IFPO | Institut Français du Proche-Orient | In French | → Area studies |
| IFR | Institut Fédératif de Recherche | In French | → Research policy |
| IFR PPF | Institut fédératif de recherche Paris-Nord Plaine de France | In French | → Research policy |
| IFRAMES | Institut de Formation, de Recherche et d'Animation des Métiers Éducatifs et Sociaux | In French | → Social aid → Education |
| IFREMER | Institut Français de Recherche pour l'Exploitation de la Mer | In French | → Marine research, oceanography |
| IFRI | Institut Français des Relations Internationales | In French | → Research institutes → International relations |
| IFRTP | Institut Français pour la Recherche et la Technologie Polaire | In French | → Research institutes → Earth sciences |
| IFT | Institut de Formation des Techniciens | In French | → Specialized or (poly)technical colleges |
| IFT | Institut Facultaire de Technologie | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| IFTH | Institut Français du Textile et de l'Habillement | In French | → Textile industry |
| IFTSTP | Institut de Formation des Techniciens Spécialisés des Travaux Publics | In French | → Specialized or (poly)technical colleges → Civil engineering → Civil engineering and land transport |
| IFV | Institut Français de Vienne | In French | → International relations |
| IGAENR | Inspection Générale de l'Administration de l'Éducation | In French | → Central administration → Education |
| IGB | Inspection Générale des Bibliothèques | In French | → Libraries → Public administration, government |
| IGBMC | Institut de Génétique et de Biologie Moléculaire et Cellulaire | In French | → Genetics → Cytology → Biochemistry, biophysics |
| IGEN | Inspection Générale de l'Éducation Nationale | In French | → Central administration → Education |
| IGF | Inspection Générale des Finances | In French | → Finance → Public administration, government |
| IgG | Immunoglobuline G | In French | → Biochemistry, biophysics |
| IGH | Immeuble de Grande Hauteur | In French | → Accommodation → Regional planning |
| IgIV | Immunoglobuline intraveineuse | In French | → Biochemistry, biophysics |
| IGM | Institut Gaspard Monge | In French | |
| IGMHB | Institut de Génie Mécanique - Université des Sciences et de la Technologie Haouari Boumediene | In French | → Higher education, universities → Mechanical engineering |
| IGN | Institut Géographique National | In French | → Geodesy, cartography → Geography |
| IGPN | Inspection Générale de la Police Nationale | In French | → Police → Central administration |
| IGR | Institut Gustave-Roussy | In French | → Oncology |
| IGS | Inspection Générale des Services | In French | → Public administration, government |
| IGS | Ingénieurs-Géomètres Suisses = IGS | Ingenieur-Geometer Schweiz | In German |
In French | → Organizations and associations → Applied sciences, technology |
| IHES | Institut des Hautes Études Scientifiques | In French | → Mathematics and natural sciences |
| IHESI | Institut des Hautes Études de la Sécurité Intérieure | In French | → Police |
| IHESI | Institut des Hautes Études en Sécurité Intérieure | In French | |
| IHEST | Institut des Hautes Études pour la Science et la Technologie | In French | → Mathematics and natural sciences → Engineering, technology |
| IHM | Interface Homme-Machine = MDI | Människa-datorinteraktion | In Swedish = MMI | Man-Machine Interaction | In English = CHI | Computer-Human Interaction | In English |
In French | → Human-computer interaction |
| IHTP | Institut d'Histoire du Temps Présent (www.ihtp.cnrs.fr) | In French | → Research institutes → History |
| IIAC | Institut Interdisciplinaire d'Anthropologie du Contemporain | In French | → Research institutes → Sociology |
| IIAT | Institut International d'Agriculture Tropicale = IITA | International Institute of Tropical Agriculture | In English |
In French | → Research institutes → Agricultural sciences |
| IIB | Institut International de Bibliographie | In French | → Bibliography |
| IICI | Institut International de Coopération Intellectuelle | In French | → Organizations and associations → International relations |
| IICP | Institut International de Communication de Paris | In French | → Higher education, universities → 659 |
| IIP | Institut International de la Presse | In French | → Newspapers, journalism |
| IJBA | Institut de Journalisme de Bordeaux Aquitaine | In French | → Specialized or (poly)technical colleges → Newspapers, journalism |
| IJM | Institut Jacques Monod (www.ijm.jussieu.fr) | In French | → Research institutes → Biological sciences |
| ILF | Institut de Linguistique Française | In French | → Linguistics |
| ILGA | Interférométrie Laser pour la Gravitation et l'Astrophysique | In French | → Astronomy → Physics → Optics |
| ILM | Institut Louis Malardé | In French | → Medicine |
| IM3 | Institut Mondor de Médecine Moléculaire | In French | → Biological sciences → Medicine |
| IMAO | Institut Monétaire de l'Afrique de l'Ouest (www.wami-imao.org) = WAMI | West African Monetary Institute | In English |
In French | → International economic cooperation |
| IMASSA | Institut de Médecine Aérospatiale - Service de Santé des Armées | In French | → Medicine → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| IMC | Indice de Masse Corporelle | In French | → Personal health and hygiene |
| IME | Institut Méditerranéen de l'Eau | In French | → Hydrology → Environmental technology, water supply, waste management |
| IME | Institut Monétaire Européen = EMI | European Monetary Institute | In English = EWI | Europäisches Währungsinstitut | In German = EMI | Európai Monetáris Intézet | In Hungarian = ERI | Euroopan rahapoliittinen instituutti | In Finnish = EMI | Europees Monetair Instituut | In Dutch |
In French | → Banks → European Union |
| IMM | Institut Marocain de Management | In French | → Management → Higher education, universities |
| IMM | Institut des Mines de Marrakech | In French | → Specialized or (poly)technical colleges → Mining |
| IMOD | Informatique et Mathématiques de l'Organisation et de la Décision | In French | → Computer science → Management → Mathematics |
| IMP/LMM | Ingénierie des Matériaux Polymères/ Laboratoire Matériaux Macromoléculaires | In French | → Research institutes → 620 → Plastic industry |
| IMVN | Image, Multimédia et Vie Numérique | In French | → Computer science → Cinema, movies |
| IN2P3 | Institut National de Physique Nucléaire et de Physique des Particules | In French | → 539 → Nuclear, atomic, and molecular physics |
| INAA | Institut National Agronomique d'Alger | In French | → Specialized or (poly)technical colleges → Agricultural sciences |
| INADR | Institut National Agronomique pour le Développement Rural | In French | → Specialized or (poly)technical colleges → Agricultural sciences |
| INAF | Institut des Nutraceutiques et des Aliments Fonctionnels | In French | → Nutrition → Agricultural sciences → Beverage industry → Food technology |
| INASO | Institut National de Formation Supérieure en Agriculture Saharienne de Ouargla | In French | → Specialized or (poly)technical colleges → Agricultural sciences |
| INATN | Institut National Agronomique de Tunisie | In French | → Specialized or (poly)technical colleges → Agricultural sciences |
| INATS | Institut National Agronomique de Thiès | In French | → Specialized or (poly)technical colleges → Agricultural sciences |
| INAV | Institut National Agronomique et Vétérinaire Hassen II | In French | → Specialized or (poly)technical colleges → Agricultural sciences |
| INB | Installation Nucléaire de Base | In French | → Nuclear technology |
| INCA | Institut National du Cancer | In French | → Oncology |
| INED | Institut National d'Études Démographiques | In French | → Research institutes → Demography |
| INELEC | Institut National d'Électricité et d'Électronique | In French | → Specialized or (poly)technical colleges → Electrical engineering → Electronics |
| INERIS | Institut National de l'Environnement Industriel et des Risques | In French | → Research institutes → Nature → Engineering, technology |
| INES | Institut Notarial de l'Entreprise et des Sociétés | In French | → 334 → Law, jurisprudence |
| INESTENE | INstitut d'Évaluation des STratégies ENergétiques Européennes | In French | → 6208 |
| INFSB | Institut National de Formation Supérieure du Bâtiment | In French | → Specialized or (poly)technical colleges → Building |
| INGM | Institut National de Génie Mécanique | In French | → Specialized or (poly)technical colleges → Mechanical engineering |
| INHA | Institut National d'Histoire de l'Art | In French | → Arts → History |
| INHC | Institut National des Hydrocarbures et Chimie | In French | → Specialized or (poly)technical colleges → Chemical technology → Chemistry |
| INHES | Institut National des Hautes Études de Sécurité | In French | |
| INI | Institut National d'Informatique | In French | → Specialized or (poly)technical colleges → Computer science |
| INIA | Institut National des Industries Alimentaires | In French | → Specialized or (poly)technical colleges → Beverage industry → Food technology |
| INIM | Institut National des Industries Manufacturières | In French | → Specialized or (poly)technical colleges → 68 |
| INIST | Institut National d'Information Scientifique et Technique | In French | → Libraries → Mathematics and natural sciences → Applied sciences, technology |
| INJENO | INitiatives de parents de Jeunes Épileptiques du Nord | In French | → Organizations and associations → Neurology |
| INK | Impression Neuro-Kinésiologique = INK | Imprinting Neuro-Kinesiology | In English |
In French | → Psychology |
| INLN | Institut Non Linéaire de Nice Sophia Antipolis | In French | → Physics |
| INMC | Institut National des Matériaux de Construction | In French | → Specialized or (poly)technical colleges → Building |
| INNORPI | Institut National de la Normalisation et de la Propriété Industrielle | In French | → Standardization → Industrial property |
| INPES | Institut National de Prévention et d’Éducation pour la Santé | In French | → Education → Public health and hygiene |
| INPG | Institut National Polytechnique de Grenoble | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| INPI | Institut National de la Propriété Industrielle | In French | → Industrial property |
| INPL | Institut National Polytechnique de Lorraine (http://ww.inpl-nancy.fr) | In French | → Specialized or (poly)technical colleges |
| INPT | Institut National Polytechnique de Toulouse | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| INPT | Institut National des Postes et Télécommunications | In French | → Specialized or (poly)technical colleges → Telecommunications |
| INRA | Institut National de la Recherche Agronomique (www.inra.fr) | In French | → Biological sciences → Zoology → Agricultural sciences |
| INRETS | Institut National de Recherche sur les Transports et leur Sécurité | In French | → Research institutes → Transport and postal services → Vehicle engineering |
| INRIA | Institut National de Recherche en Informatique et Automatique | In French | → Research institutes → Computer science → Electrical engineering |
| INRIA | Institut National de Recherche en Informatique et en Automatique | In French | → Research institutes → Computer science → Mechanical engineering |