| IBISC | Informatique, Biologie Intégrative et Systèmes Complexes | In French | → Computer science → Biological sciences |
| IBM | International Business Machines (Corporation) | In English | → Hardware |
| IBM | International Business Machines | In English | → Computer science |
| IBMG | Internationales Büro für Maß und Gewicht (www.bipm.org) = BIPM | Bureau International des Poids et Mesures | In French = BIPM | Bureau Internacional de Pesos e Medidas | In Portuguese = BIPM | Buroo Internacia pri Pezoj kaj Mezuroj | In Esperanto |
In German | → Standardization |
| IBMJ | IBM Journal Research Development | In English | → Serial publications, periodicals → Computer science |
| IBN | Institut Belge de Normalisation = BNI | Belgisch Instituut voor Normalisatie | In Dutch |
In French | → Standardization |
| IC | Islamic Culture | In English | → Civilization, culture, progress → Linguistics → Literature |
| IC | Intercommunications | In English | → Networks, communication → Telecommunications |
| IC | Intercomputer Communication | In English | → Networks, communication |
| ICA | Intelligent Communicating Agent | In English | → Computer science |
| ICAAD | Interactive Computer-Aided Analysis and Design | In English | → Computer-based techniques |
| ICAD | Institut des Cadres Dirigeants | In French | → Specialized or (poly)technical colleges → Management |
| ICAD | International Conference on Auditory Display | In English | → Congresses → Human-computer interaction → Telecommunications |
| ICAE | Integrated Computer-Aided Engineering | In English | → Serial publications, periodicals → Computer-based techniques → Engineering, technology |
| ICAITI | Instituto Centroamericano de Investigación y Tecnología | In Spanish | → Research institutes → Research policy → Engineering, technology |
| ICAM | Integrated Computer-Aided Manufacturing | In English | → Computer-based techniques → Engineering, technology |
| ICANN | Internet Corporation for Assigned Names and Numbers (www.icann.org) | In English | → Networks, communication |
| ICANN | International Conference on Artificial Neural Networks | In English | → Congresses → Artificial intelligence |
| ICB | International Centre of Biocybernetics | In English | → Research institutes → Computer science → Electronics |
| ICC | International Computing Centre (www.unicc.org) = CICE | Centro Internacional de Cálculos Electrónicos | In Spanish = CIC | Centre International de Calcul | In French = CIC | Centro Internacional de Computação | In Portuguese |
In English | → Computer science → United Nations |
| ICC | Interface Control Chart | In English | → Human-computer interaction |
| ICC | Intercomputer Communication | In English | → Networks, communication |
| ICC | Interface Control Contractor | In English | → Human-computer interaction |
| ICC | Intercomputer Channel | In English | → Networks, communication |
| ICCHP | International Conference on Computers Helping People with Special Needs | In English | → Congresses → Computer-based techniques |
| ICCPR | International Conference on Cultural Policy Research | In English | → Civilization, culture, progress → Politics |
| ICCR | Indian Council for Cultural Relations | In English | → Civilization, culture, progress |
| ICD | Interface Control Documentation | In English | → Human-computer interaction |
| ICD | Interface Control Document | In English | → Human-computer interaction |
| ICD | Interface Control Drawing | In English | → Human-computer interaction |
| ICDA | Integrated Cached Disk Array | In English | → Hardware |
| ICDAR | International Conference on Document Analysis and Recognition | In English | → Congresses → Document processing |
| ICDS | Interface Control Document Schedule | In English | → Human-computer interaction |
| ICEIS | International Conference on Enterprise Information Systems | In English | → Congresses → Knowledge management → Data |
| ICF | Interface Control Function | In English | → Human-computer interaction |
| ICGA | IEEE (Institute of Electrical and Electronics Engineers) Computer Graphics Applications | In English | → Serial publications, periodicals → Graphical processing |
| ICH | Interkultura Centro Herzberg | In Esperanto | → Civilization, culture, progress |
| ICHO | Iran Cultural Heritage Organisation | In English | → Organizations and associations → Civilization, culture, progress |
| ICI | Institutul Naţional de Cercetare-Dezvoltare în Informatică | In Romanian | → Computer science |
| ICI | Information, Coordination, Incitation | In French | → Computer science |
| ICIE | Institute for Communications and Information Engineering | In English | → Telecommunications → Computer science |
| ICL | Interface Control Layout | In English | → Human-computer interaction |
| ICMI | International Customer Management Institute (www.incoming.com) | In English | → Management |
| ICMI | International Conference on Multimodal Interfaces | In English | → Congresses → Human-computer interaction |
| ICMP | Internet Control Message Protocol | In English | → Internet |
| 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 | Intercomputer Network | In English | → Networks, communication |
| 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 |
| ICOS | Integrated Communications Organizing Standard | In English | → Standardization → Telecommunications |
| ICOS | Integrated Cargo Operating Software | In English | → Software → Transport and postal services |
| ICP | Interface Control Panel | In English | → Networks, communication |
| ICP | Interface Change Proposal | In English | → Networks, communication |
| 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 |
| ICRB | Interface Change Review Board | In English | → Networks, communication |
| 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 | 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 Classification for Standards | In English | → Standardization |
| 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 |
| ICT | Interface Control Tooling | In English | → Human-computer interaction |
| ICT | Informatie- en Communicatietechnologie = 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 = ICT | Information and Communications Technology | In English = IKT | Informations- og kommunikationsteknologi | In Danish = IKT | Inligtings- en kommunikasietegnologie | In Afrikaans = TMK | Teknologi Maklumat dan Komunikasi | In Malay |
In Dutch | → Computer science → Telecommunications |
| ICT | Information and Communications Technology = TIC, IKT, TMK (look above) |
In English | → Computer science → Telecommunications |
| ICTP | Institutul de Calcul Tiberiu Popoviciu | In Romanian | → Computer science → Mathematics |
| ICTT | Interaction Collaborative, Télé-formation, Télé-activités | In French | → Human-computer interaction → Networks, communication → Education |
| ICU | Interface Control Unit | In English | → Human-computer interaction |
| ICWG | Interface Control Working Group | In English | → Human-computer interaction |
| ID | Interface Document | In English | → Human-computer interaction |
| ID | Interface Device | In English | → Hardware → Human-computer interaction |
| ID | Informatique Distribuée | In French | → Software → Networks, communication |
| IDA | Interface Definition Agreement | In English | → Human-computer interaction |
| IDA | Intermediate Data Array | In English | → Data |
| IDA | Integrated Display Assembly | In English | → Human-computer interaction → Electronics |
| IDAC | Integrated Digital-Analog Converter | In English | → Hardware |
| 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 | Integrated Data Denial | In English | → Data |
| IDD | IGS Data Denial | In English | → Data |
| IDD | Interface Design Document | In English | → Human-computer interaction |
| IDD | Interface Description Document | In English | → Human-computer interaction |
| IDD | Interface Definition Document | In English | → Human-computer interaction |
| IDE | Interactive Development Environment | In English | → Software → 6585 |
| IDEMM | Ingénierie Documentaire, Édition et Médiation Multimédia | In French | → Document processing → Libraries → Graphic industries, printing, publishing |
| IDEP | Interservice Data Exchange Program | In English | → Data |
| 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 |
| 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 | Interface Digital Processor | In English | → Hardware → Human-computer interaction |
| IDP | Integrated Data Processing | In English | → Data |
| IDR | Interim Data Review | In English | → Data |
| IDRA | Interdivision Revision Authorization | In English | → Management |
| IDRD | Information Definition Requirements Document | In English | → Knowledge management |
| IDRD | Internal Data Requirement Description | In English | → Knowledge management |
| IDS | Interface Data Sheet | In English | → Human-computer interaction → Data |
| IDS | Information Data System | In English | → Data → Knowledge management |
| IDS | Integrated Display System | In English | → Human-computer interaction |
| 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 |
| IDWA | Interdivisional Work Authorization | In English | → Management |
| IEDR | Ireland's Domain Registry | In English | → Networks, communication → Telecommunications |
| IEEEN | IEEE (Institute of Electrical and Electronics Engineers) Network | In English | → Serial publications, periodicals → Computer science → Telecommunications |
| IEI | Istituto di Elaborazione dell’Informazione | In Italian | → Computer science |
| IEIWG | International Element Interface Working Group | In English | → Human-computer interaction |
| IEMCAP | Intrasystem Electromagnetic Compatibility Computer Analysis Program | In English | → Computer-based techniques → Electrical engineering |
| IER | Inter–European Research | In English | → Research policy |
| IES | Information Extraction System | In English | → Data |
| IESG | Internet Engineering Steering Group | In English | → Organizations and associations → Internet |
| IETF | Internet Engineering Task Force | In English | → Organizations and associations → Networks, communication |
| IETS | Interim European Telecommunications Standard | In English | → Standardization → Telecommunications |
| IFA | Internacia Fonetika Alfabeto = AFI | Alfabetul Fonetic Internaţional | In Romanian = LFE | Lizherenneg Fonetikel Etrebroadel | In Breton = МФА | Международната фонетична азбука | In Bulgarian = IPA | Internationales Phonetisches Alphabet | In Tosk = AFI | Alfabet fonètic internacional | In Catalan = 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 = IFA | Internationoal Fonetisch Alfabet | In Vlaams = AFN | Alfabeti Fonetik Ndërkombëtar | In Albanian |
In Esperanto | → Writing systems |
| IFA | Internationoal Fonetisch Alfabet = AFI, LFE, МФА, IPA, ΔΦΑ, API, NAF, AFE, AFN (look above) |
In Vlaams | → Writing systems |
| IFA | Interface Functional Analysis | In English | → Human-computer interaction |
| IFAN | International Federation of Standards Users | In English | → Standardization → Organizations and associations |
| IFCG | Interface Control Group | In English | → Human-computer interaction |
| IFCPAR | Indo-French Centre for the Promotion of Advanced Research | In English | → Research policy |
| IFDL | Interfacility Data Link | In English | → Data |
| IFF | Interchange File Format | In French | → Data |
| IFIP | International Federation for Information Processing | In English | → Computer science → Organizations and associations |
| IFK | Internationales Forschungszentrum Kulturwissenschaften (www.ifk.ac.at) | In German | → Research institutes → Civilization, culture, progress |
| IFM | In-Flight Maintenance | In English | → Maintenance and logistics → Spaceflight engineering, astronautics → Spaceflight engineering, astronautics |
| IFO | Information Systems Office | In English | → Knowledge management |
| IFR | Institut Fédératif de Recherche | In French | → Research policy |
| IFR PPF | Institut fédératif de recherche Paris-Nord Plaine de France | In French | → Research policy |
| IFS | Interface Specification | In English | → Human-computer interaction |
| IFT | Interface Tool | In English | → Human-computer interaction |
| IFTD | Interface Terminal Distributor | In English | → Human-computer interaction |
| IFU | Interface Unit | In English | → Human-computer interaction |
| IGAAC | Internet Guide for Asian American Cybernauts | In English | → Internet |
| IGB | Institute for Genomics and Bioinformatics | In English | → Biological sciences → Computer science |
| IGCS | Internet Guide for China Studies | In English | → Internet → Area studies |
| IGDA | International Game Developers Association (www.igda.org) | In English | → Associations → Software → Entertainment |
| IGDS | Interactive Graphic Design System | In English | → Graphical processing |
| IGES | Initial Graphic Exchange Specification | In English | → Graphical processing |
| IGF | Industrielle Gemeinschaftsforschung | In German | → Research policy → Engineering, technology |
| IGMP | Internet Group Management Protocol | In English | → Networks, communication → Telecommunications |
| IGP | Internal Gateway Protocol | In English | → Networks, communication |
| IGU | Interfaz Gráfica de Usuario = GUI | Graphical User Interface | In English |
In Spanish | → Human-computer interaction |
| 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 |
| IHSR | Integrated Hardware/Software Review | In English | → Hardware → Software |
| IHV | Independent Hardware Vendor | In English | → Hardware → Trade |
| II | Instytut Informatyk | In Polish | → Research institutes → Computer science |
| IIMB | Indian Institute of Management of Bangalore | In English | → Management → Economics → Higher education, universities |
| IIOC | Independent International Organisation for Certification | In English | → Organizations and associations → Standardization → Quality management |
| IIOP | Internet Inter Orb Protocol | In English | → Software → Networks, communication |
| IIS | Interface Identification Sheet | In English | → Human-computer interaction |
| IISNC | International Institute for the Study of Nomadic Cultures | In English | → Civilization, culture, progress → Migrations |
| IISS | Integrated Information Support System | In English | → Maintenance and logistics |
| IIT | Istituto di Informatica e Telematica | In Italian | → Computer science → Telecommunications |
| IJCAI | International Joint Conference on Artificial Intelligence | In English | → Congresses → Artificial intelligence |
| IJCV | International Journal of Computer Vision | In English | → Serial publications, periodicals → Computer science |
| IJDAR | International Journal in Document Analysis and Recognition | In English | → Serial publications, periodicals → Computer-based techniques |
| IJHSC | International Journal of High Speed Computing | In English | → Serial publications, periodicals → Computer science |
| IJICS | International Journal of Intelligent Control and Systems | In English | → Artificial intelligence → Serial publications, periodicals → Engineering, technology |
| IJIG | International Journal of Image and Graphics | In English | → Serial publications, periodicals → Graphical processing → Image processing |
| IJMM | International Journal of Mini Microcomputers | In English | → Serial publications, periodicals → Hardware → Electronics |
| IJMoS | International Journal of Modelling and Simulation | In English | → Computer simulation → Serial publications, periodicals |
| IJScA | International Journal of Supercomputer Applications | In English | → Serial publications, periodicals → Computer science |
| IKT | Inligtings- en kommunikasietegnologie = ICT, TIC, TMK (look above) |
In Afrikaans | → Computer science → Telecommunications |
| IKT | Informations- und Kommunikationstechnologie = ICT, TIC, TMK (look above) |
In German | → Computer science → Telecommunications |
| IKT | Informations- og kommunikationsteknologi = ICT, TIC, TMK (look above) |
In Danish | → Computer science → Telecommunications |
| ILAC | International Laboratory Accreditation Conference | In English | → Standardization → Quality management |
| ILBM | InterLeaved BitMap | In English | → Graphical processing → Image processing |
| ILC | Istituto di Linguistica Computazionale | In Italian | → Computer-based techniques → Linguistics |
| ILCA | (Research) Institute for Languages and Cultures of Asia and Africa | In English | → Research institutes → Civilization, culture, progress → Language, linguistics, literature → Area studies |
| ILIPT | Intelligent Logistics for Innovative Product Technologies | In English | → Maintenance and logistics |
| ILM | Internationales Logistikmanagement | In German | → Maintenance and logistics |
| ILM | Information Lifecycle Management | In English | → Document processing → Knowledge management |
| ILMF | Intermediate-Level Maintenance Facility | In English | → Maintenance and logistics |
| ILO | Integrated Logistics Operations | In English | → Maintenance and logistics |
| ILP | Integrated Logistics Panel | In English | → Maintenance and logistics |
| ILP | Inductive Logic Programming | In English | → Computer science → 5196 |
| ILS | Integrated Logistics System | In English | → Maintenance and logistics |
| ILS | Integrated Logistics Support | In English | → Maintenance and logistics |
| ILS | Integrated Library System = SIGB | Système Intégré de Gestion de Bibliothèque | In French = АБИС | Автоматизированные библиотечные информационные системы | In Russian |
In English | → Knowledge management → Libraries → Software |
| ILSA | Integrated Logistics Support Analysis | In English | → Maintenance and logistics |
| ILSC | Integrated Logistics Support Concept | In English | → Maintenance and logistics |
| ILSCP | Integrated Logistics Support Concept Plan | In English | → Maintenance and logistics |