| ICMI | International Conference on Multimodal Interfaces | In English | → Congresses → Human-computer interaction |
| ICMI | International Commission on Mathematical Instruction (www.mathunion.org/ICMI/) | In English | → Organizations and associations → Mathematics → Education |
| ICMI | International Customer Management Institute (www.incoming.com) | In English | → Management |
| ICMJE | International Committee of Medical Journal Editors (www.icmje.org) | In English | → Serial publications, periodicals → Medicine |
| ICMP | Internet Control Message Protocol | In English | → Internet |
| ICMS | International Committee on Museum Security | In English | → Museums |
| ICMS | Information, Communication, Modélisation et Simulation (www.polytechnicum.org/icms/) | In French | → Higher education, universities → Computer-based techniques |
| ICMS | International College of Management Sydney | In English | → Specialized or (poly)technical colleges → Computer science |
| ICN | International Conference on Nutrition = CIN | Conferencia Internacional sobre Nutrición | In Spanish = CIN | Conférence Internationale sur la Nutrition | In French = CIN | Conferência Internacional sobre Nutrição | In Portuguese |
In English | → Congresses → Nutrition |
| ICN | Intercomputer Network | In English | → Networks, communication |
| ICOC | Indonesia Council Open Conference | In English | → Organizations and associations |
| ICOLD | International Commission on Large Dams (www.icold-cigb.org) | In English | → Organizations and associations → 627 |
| IComM | IEEE (Institute of Electrical and Electronics Engineers) Communications Magazine | In English | → Serial publications, periodicals → Networks, communication → Telecommunications |
| ICONTEC | Instituto Colombiano de Normas Técnicas y Certificación (www.icontec.org.co) | In Spanish | → Standardization |
| ICOPHIL | International Conference on Philippine Studies | In English | → Congresses → Area studies |
| ICORD | International Collaboration on Repair Discoveries | In English | → Organizations and associations → Neurology → Traumatology |
| ICOS | Integrated Communications Organizing Standard | In English | → Standardization → Telecommunications |
| ICOS | Integrated Cargo Operating Software | In English | → Software → Transport and postal services |
| ICOTT | International Congress of Official Tourist Traffic Associations | In English | → Organizations and associations → Tourism |
| ICP | Interface Control Panel | In English | → Networks, communication |
| ICP | Interface Change Proposal | In English | → Networks, communication |
| ICPDR | International Commission for the Protection of the Danube River | In English | → Organizations and associations → Nature and society → 627 |
| ICPO | International Criminal Police Organization | In English | → Organizations and associations → Police |
| ICPO | Institute of Cytology & Preventive Oncology | In English | → Research institutes → Cytology → Oncology |
| ICPR | Indian Council of Philosophical Research | In English | → Organizations and associations → Philosophy, psychology |
| ICPS | International Conference on the Physics of Semiconductors | In English | → Congresses → Electricity, magnetism, electromagnetism → 539 → Electrical engineering |
| ICR | Interface Compatibility Record | In English | → Networks, communication |
| ICR | Intelligent Character Recognition | In English | → Writing systems → Computer-based techniques |
| ICRA | Internet Content Rating Association | In English | → Internet → Organizations and associations |
| ICRA | Association de Classification du Contenu de l'Internet | In French | → Internet → Libraries → Associations |
| ICRAT | International Conference on Research in Air Transportation | In English | → Congresses → Transport and postal services |
| ICRB | Interface Change Review Board | In English | → Networks, communication |
| ICRC | International Committee of the Red Cross (www.icrc.org) = CICR | Comité Internacional de la Cruz Roja | In Spanish = CICR | Comité International de la Croix-Rouge | In French = CICV | Comitê Internacional da Cruz Vermelha | In Portuguese = МККК | Международный комитет Красного Креста | In Russian = SSKK | Starptautiskā Sarkanā Krusta Komiteja | In Latvian = CICR | Comitato Internazionale della Croce Rossa | In Italian = ICRC | 적십자 국제 위원회 | In Korean = CICR | Comitè Internacional de la Creu Roja | In Catalan = CICR | Comitât entèrnacionâl de la Crouèx-Roge | FRP |
In English | → Organizations and associations → Medicine |
| ICRC | 적십자 국제 위원회 (www.icrc.org) = CICR, CICV, МККК, SSKK (look above) |
In Korean | → Organizations and associations → Medicine |
| ICRISAT | International Crops Research Institute for the Semi-Arid Tropics | In English | → Organizations and associations → Agricultural sciences |
| ICRU | International Commission on Radiation Units and Measurements = CIUMR | Comisión Internacional de Unidades y Medidas Radiológicas | In Spanish = CIUMR | Commission Internationale des Unités et des Mesures de Radiation | In French = CIUMR | Comissão Internacional de Unidades e Medidas Radiação | In Portuguese |
In English | → Standardization → Nuclear technology |
| ICS | International Classification for Standards | In English | → Standardization |
| ICS | Intercommunication System | In English | → Networks, communication → Telecommunications |
| ICS | Interface Control Specification | In English | → Human-computer interaction |
| ICS | Interpretive Computer Simulator | In English | → Computer simulation |
| ICS | International Commission on Stratigraphy | In English | → Organizations and associations → Stratigraphy |
| ICS | International Child Support | In English | → Organizations and associations |
| ICSA | International Cultic Studies Association | In English | → Associations → Social sciences |
| ICSC | International Council of Shopping Centers | In English | → Organizations and associations → Trade |
| ICSE | Impact of Computing in Science and Engineering | In English | → Serial publications, periodicals → Computer science → Mathematics and natural sciences → Engineering, technology |
| ICSM | IEEE (Institute of Electrical and Electronics Engineers) Computer Systems Magazine | In English | → Serial publications, periodicals → Hardware |
| ICSSR | Indian Council of Social Science Research | In English | → Organizations and associations → Social sciences |
| ICSTI | International Council for Scientific and Technical Information | In English | → Libraries → Mathematics and natural sciences → Engineering, technology |
| ICSU | International Council of Scientific Unions | In English | → Organizations and associations → Mathematics and natural sciences |
| ICSV | International Congress on Sound and Vibration | In English | → Congresses → Acoustics |
| ICT | Information and Communications Technology = TIC | Tecnologías de la Información y la Comunicación | In Spanish = IKT | Informations- und Kommunikationstechnologie | In German = TIC | Technologies de l'Information et de la Communication | In French = IKT | Informations- og kommunikationsteknologi | In Danish = IKT | Inligtings- en kommunikasietegnologie | In Afrikaans = ICT | Informatie- en Communicatietechnologie | In Dutch = TMK | Teknologi Maklumat dan Komunikasi | In Malay |
In English | → Computer science → Telecommunications |
| ICT | Informatie- en Communicatietechnologie = TIC, IKT, TMK (look above) |
In Dutch | → Computer science → Telecommunications |
| ICT | Interface Control Tooling | In English | → Human-computer interaction |
| ICTA | Instituts et Centres Techniques Agricoles | In French | → Research institutes → Agricultural sciences |
| ICTP | Institutul de Calcul Tiberiu Popoviciu | In Romanian | → Computer science → Mathematics |
| ICTS | International Conference on Thai Studies | In English | → Congresses → Area studies |
| ICTT | Interaction Collaborative, Télé-formation, Télé-activités | In French | → Human-computer interaction → Networks, communication → Education |
| ICTU | Irish Congress of Trade Union | In English | → Organizations and associations → Labour, labour economics |
| ICTU | Irish Congress of Trade Unions | In English | → Organizations and associations → Labour, labour economics |
| ICU | Interface Control Unit | In English | → Human-computer interaction |
| ICU | Istituto per la Cooperazione Universitaria | In Italian | → Organizations and associations → Higher education, universities |
| ICUAER | International Commitee on Urgent Anthropological and Ethnological Research | In English | → Organizations and associations → Ethnology → Anthropology |
| ICWG | Interface Control Working Group | In English | → Human-computer interaction |
| ID | Interface Device | In English | → Hardware → Human-computer interaction |
| ID | Interface Document | In English | → Human-computer interaction |
| ID | Informatique Distribuée | In French | → Software → Networks, communication |
| ID | Initiative Développement | In French | → Organizations and associations → Development |
| IDA | Integrated Display Assembly | In English | → Human-computer interaction → Electronics |
| IDA | International Development Association (www.worldbank.org/ida/) = 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 = MAP | Міжнародна асоціація розвитку | In Serbian |
In English | → Associations → Development |
| IDA | Interface Definition Agreement | In English | → Human-computer interaction |
| IDA | Intermediate Data Array | In English | → Data |
| IDAC | Integrated Digital-Analog Converter | In English | → Hardware |
| IDAQP | Infinite Dimensional Analysis, Quantum Probability and Related Topics | In English | → Serial publications, periodicals → Mathematics → Physics |
| IDAR | Interim Data Assessment Review | In English | → Data |
| IDARS | Integrated Document Archive and Retrieval System | In English | → Document processing → Knowledge management |
| IDAS | Integrated Data Acquisition System | In English | → Data |
| IDBMS | Integrated Data Base Management System | In English | → Software → Data |
| IDC | IMBLMS Digital Computer | In English | → Hardware |
| IDC | Interface Document Control | In English | → Human-computer interaction |
| IDD | Interface Design Document | In English | → Human-computer interaction |
| IDD | IGS Data Denial | In English | → Data |
| IDD | Interface Definition Document | In English | → Human-computer interaction |
| IDD | Integrated Data Denial | In English | → Data |
| IDD | Interface Description Document | In English | → Human-computer interaction |
| IDE | Interactive Development Environment | In English | → Software → 6585 |
| IDEM | Informations- und Dokumentationsstelle Ethik in der Medizin | In German | → Libraries → Ethics → Medicine |
| IDEMM | Ingénierie Documentaire, Édition et Médiation Multimédia | In French | → Document processing → Libraries → Graphic industries, printing, publishing |
| IDEO | Institut Dominicain d'Études Orientales du Caire | In French | → Research institutes → Roman catholic church → Area studies |
| IDEP | Interservice Data Exchange Program | In English | → Data |
| IDF | International Diabetes Federation (www.idf.org) = FID | Fédération Internationale du Diabète | In French = FID | Federación Internacional de Diabetes | In Spanish |
In English | → Organizations and associations → Pathology |
| IDF | International Dairy Federation | In English | → Organizations and associations → Agricultural sciences → Food technology |
| IDIOM | Information Diffusion across Interactive Online Media | In English | → 007 → Newspapers, journalism → Telecommunications |
| IDIST | Formation et Recherche en Sciences de l'Information et du Document | In French | → Document processing → Knowledge management → Libraries |
| IDL | Interface Definition Language | In English | → Management |
| IDL | Interface Description Language | In English | → Programming languages → Human-computer interaction |
| IDM | Institut für den Donauraum und Mitteleuropa | In German | → Research institutes → International relations → Area studies |
| IDMC | Independent Data-Monitoring Committee | In English | → Data |
| IDMM | Intermediate and Depot Maintenance Manual | In English | → Maintenance and logistics |
| IDMRD | Intermediate and Depot Maintenance Requirements Document | In English | → Maintenance and logistics |
| IDMRS | Intermediate Depot Maintenance Requirements | In English | → Maintenance and logistics |
| IDMS | Information and Data Management System | In English | → Data → Knowledge management |
| IDN | Internationalized Domain Name | In English | → Networks, communication |
| IDO | Interdivisional Operation | In English | → 0057 |
| IDOS | Integrated Display Operating System | In English | → Operating systems |
| IDOT | Instrument Digital On-Line Transcriber | In English | → Hardware |
| IDP | Integrated Data Processing | In English | → Data |
| IDP | Interface Digital Processor | In English | → Hardware → Human-computer interaction |
| IDP | International Dunhuang Project | In English | → Libraries → Manuscripts |
| IDR | Interim Data Review | In English | → Data |
| IDRA | Interdivision Revision Authorization | In English | → Management |
| IDRD | Internal Data Requirement Description | In English | → Knowledge management |
| IDRD | Information Definition Requirements Document | In English | → Knowledge management |
| IDS | Integrated Display System | In English | → Human-computer interaction |
| IDS | Interface Data Sheet | In English | → Human-computer interaction → Data |
| IDS | Information Data System | In English | → Data → Knowledge management |
| IDSA | Institute for Defense Studies and Analyses | In English | → Research institutes → Polemology → 355 |
| IDSD | Institutional Data System Division | In English | → Maintenance and logistics |
| IDSNET | Integrated Defense System Network | In English | → 355 → Military engineering → Networks, communication |
| IDSNET | Integrated Defense Simulator Network | In English | → Military engineering → Networks, communication |
| IDTC | IEEE (Institute of Electrical and Electronics Engineers) Design Test Computers | In English | → Serial publications, periodicals → Hardware |
| IDU | Interface Demonstration Unit | In English | → Human-computer interaction |
| IDW | Informationsdienst Wissenschaft | In German | → Libraries → Mathematics and natural sciences |
| IDWA | Interdivisional Work Authorization | In English | → Management |
| IE | Israela Esperantisto | In Esperanto | → Serial publications, periodicals |
| IEAS | Institute of East Asian Studies | In English | → Research institutes → Area studies |
| IEC | Independent Ethics Committee | In English | → Organizations and associations → Ethics |
| IEDL | IEEE (Institute of Electrical and Electronics Engineers) Electron Device Letters | In English | → Serial publications, periodicals → Electronics |
| IEDR | Ireland's Domain Registry | In English | → Networks, communication → Telecommunications |
| IEED | Indo-European Etymological Dictionary | In English | → Dictionaries → Linguistics |
| IEEEN | IEEE (Institute of Electrical and Electronics Engineers) Network | In English | → Serial publications, periodicals → Computer science → Telecommunications |
| IEEEP | IEEE (Institute of Electrical and Electronics Engineers) Proceedings | In English | → Serial publications, periodicals → Electrical engineering |
| IEEES | IEEE (Institute of Electrical and Electronics Engineers) Spectrum | In English | → Serial publications, periodicals → Electrical engineering |
| IEEP | Institution of Electrical Engineers Proceedings | In English | → Serial publications, periodicals → Electrical engineering |
| IEF | International Energy Foundation | In English | → Foundations → Energy economics |
| IEHS | Immigration and Ethnic History Society | In English | → Organizations and associations → Migrations → Sociology → History |
| IEI | Istituto di Elaborazione dell’Informazione | In Italian | → Computer science |
| IEIWG | International Element Interface Working Group | In English | → Human-computer interaction |
| IEJ | Israel Exploration Journal | In English | → Serial publications, periodicals |
| IEJ | Itala Esperantista Junularo (http://iej.esperanto.it) | In Esperanto | → Associations |
| IEKA | Internacia Esperanto-Klubo Aŭtomobilista | In Esperanto | → Organizations and associations → Vehicle engineering → Transport and postal services |
| IEM | Internacia Esperanto-Muzeo | In Esperanto | → Museums → Artificial languages (linguistics) |
| IEMCAP | Intrasystem Electromagnetic Compatibility Computer Analysis Program | In English | → Computer-based techniques → Electrical engineering |
| IER | Internationale Elektronische Rundschau | In German | → Serial publications, periodicals → Electronics |
| IER | Inter–European Research | In English | → Research policy |
| IEREJ | Institution of Electronic Radio Engineers Journal | In English | → Serial publications, periodicals → Electronics → Telecommunications |
| IES | Information Extraction System | In English | → Data |
| IESG | Internet Engineering Steering Group | In English | → Organizations and associations → Internet |
| IESHR | Indian Economic and Social History Review | In English | → Serial publications, periodicals → Politics → Economics |
| IEŚW | Instytut Europy Środkowo-Wschodniej | In Polish | → Research institutes |
| IET | Instruments and Experimental Techniques | In English | → Serial publications, periodicals → Physics |
| IETDL | IET (Institution of Engineering and Technology) Digital Library | In English | → Libraries → Engineering, technology |
| IETE | Institution of Electronics Telecommunication Engineers | In English | → Serial publications, periodicals → Electronics → Telecommunications |
| IETF | Internet Engineering Task Force | In English | → Organizations and associations → Networks, communication |
| IETS | Interim European Telecommunications Standard | In English | → Standardization → Telecommunications |
| IEV | In Eendracht Vooruit | In Dutch | → Organizations and associations → Sport, physical exercises |
| IExp | IEEE (Institute of Electrical and Electronics Engineers) Expert | In English | → Serial publications, periodicals → Electrical engineering |
| IFA | Interface Functional Analysis | In English | → Human-computer interaction |
| IFA | Internationoal Fonetisch Alfabet = AFI | Alfabetul Fonetic Internaţional | In Romanian = LFE | Lizherenneg Fonetikel Etrebroadel | In Breton = МФА | Международната фонетична азбука | In Bulgarian = IPA | Internationales Phonetisches Alphabet | ALS = AFI | Alfabet fonètic internacional | In Catalan = IFA | Internacia Fonetika Alfabeto | In Esperanto = IPA | International Phonetic Alphabet | In English = ΔΦΑ | Διεθνές Φωνητικό Αλφάβητο | In Greek = IPA | Internationales Phonetisches Alphabet | In German = API | Alphabet Phonétique International | In French = AFI | Alfabeto Fonético Internacional | In Spanish = AFI | Alfabeto Fonético Internacional | In Galician = NAF | Nazioarteko Alfabeto Fonetikoa | In Basque = IPA | Internationalt Phonetescht Alphabet | In Letzeburgesh = AFI | Alfabeto Fonetico Internazionale | In Italian = МФА | Международный фонетический алфавит | In Russian = AFI | Alfabeto Fonético Internacional | In Portuguese = AFI | Alfabet fonetic internacionau | In Occitan = AFE | Alfabet Fonetike Eternåcionå | In Walloon = AFN | Alfabeti Fonetik Ndërkombëtar | SQ |
[VLS] | → Writing systems |
| IFA | Internacia Fonetika Alfabeto = AFI, LFE, МФА, IPA, ΔΦΑ, API, NAF, AFE, AFN (look above) |
In Esperanto | → Writing systems |
| IFAN | International Federation of Standards Users | In English | → Standardization → Organizations and associations |
| IFB | Interfaces and Free Boundaries | In English | → Serial publications, periodicals → Physics |
| IFC | Idose Football Club | In Dutch | → Organizations and associations → Football and rugby |
| IFCAI | International Federation of Commercial Arbitration Institutions | In English | → Organizations and associations → Commercial law |
| IFCG | Interface Control Group | In English | → Human-computer interaction |
| IFCPAR | Indo-French Centre for the Promotion of Advanced Research | In English | → Research policy |
| IFDA | International Furnishings and Design Association | In English | → Associations → Drawing and applied arts |
| IFDL | Interfacility Data Link | In English | → Data |
| 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 |
| IFEF | Internacia Fervojista Esperanto Federacio | In Esperanto | → Organizations and associations → Rail transport engineering → Transport and postal services |
| IFEN | Institut Français de l'Environnement | In French | → Research institutes → Nature → Environment, environmental sciences |
| IFES | Institute of Far Eastern Studies | In English | → Research institutes → Area studies |
| IFF | Interchange File Format | In French | → Data |
| IFIC | International Food Information Council | In English | → Organizations and associations → Nutrition → Food technology |
| IFIG | Internationales Forschungs- und Informationszentrum für öffentliche Wirtschaft, Sozialwirtschaft und Genossenschaftswesen = CIRIEC | Centre International de Recherches et d'Information sur l'Économie Publique, Sociale et Coopérative | In French |
In German | → Organizations and associations → Economics |
| IFIP | International Federation for Information Processing | In English | → Computer science → Organizations and associations |
| IFITT | International Federation of Information Technology and Tourism | In English | → Organizations and associations → Tourism |
| IFK | Internationales Forschungszentrum Kulturwissenschaften (www.ifk.ac.at) | In German | → Research institutes → Civilization, culture, progress |
| IFKF | International Federation of Kidney Foundations | In English | → Organizations and associations → Medicine |
| IFLA | International Federation of Library Associations | In English | → Libraries → Organizations and associations |
| IFLA | International Federation of Library Associations and Institutions | In English | → Associations → Libraries |
| IFM | Institut Français de la Mer | In French | → Research institutes → Environment, environmental sciences → Marine research, oceanography |
| IFM | In-Flight Maintenance | In English | → Maintenance and logistics → Spaceflight engineering, astronautics → Spaceflight engineering, astronautics |
| IFO | Information Systems Office | In English | → Knowledge management |
| IFOAM | International Federation of Organic Agriculture Movements | In English | → Organizations and associations → Agricultural sciences |
| IfP | Incontro fra i Popoli | In Italian | → Organizations and associations |
| IFP | Institut Français de Presse | In French | → Specialized or (poly)technical colleges → Newspapers, journalism |
| IFP | Institut Français du Pétrole | In French | → Research institutes → Earth sciences → Mining → 665 |
| IFPCC | Institut Français des Praticiens des Procédures Collectives | In French | → Organizations and associations → Law, jurisprudence |
| IFPI | International Federation of the Phonographic Industry (www.ifpi.org) | In English | → Organizations and associations → Music |
| IFPMA | International Federation of Pharmaceutical Manufacturers & Associations (www.ifpma.org) | In English | → Organizations and associations → Pharmacology, toxicology |
| IFPS | International Federation of Palynological Societies | In English | → Organizations and associations → Paleobotany, palynology |
| IFR | Institute of Food Research | In English | → Research institutes → Agricultural sciences → Food technology |
| IFR | Institut Fédératif de Recherche | In French | → Research policy |
| IFR PPF | Institut fédératif de recherche Paris-Nord Plaine de France | In French | → Research policy |
| IFRA | INCA-FIEJ Research Association | In English | → Associations → Newspapers, journalism → Graphic industries, printing, publishing |
| IFRE | Internacia Forstista Rondo Esperantlingva | In Esperanto | → Organizations and associations → Agricultural sciences |
| 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 |
| IFS | International Feuchtwanger Society | In English | → Organizations and associations |