| GULLH | Groupe des Utilisateurs de Logiciels Libres au Havre | In French | → Organizations and associations → Software |
| GULLIVER | Groupe des Utilisateurs de Linux et des Logiciels libres d'Ille et Vilaine et Environs de Rennes | In French | → Software → Operating systems |
| GuLSE | Groupe des Utilisateurs Linux de Saint-Eustache et des environs | In French | → Organizations and associations → Operating systems |
| GULUQ | Groupe d'Utilisateurs Linux de l'Université du Québec | In French | → Organizations and associations → Operating systems |
| GULUS | Groupe d'utilisateurs de Linux de l'Université de Sherbrooke | In French | → Organizations and associations → Operating systems |
| GUM | Generalized Upper Model | In English | → Programming languages |
| GUML | Groupement des Utilisateurs Mauriciens de Linux | In French | → Organizations and associations → Operating systems |
| GVN | Grand Versailles Numérique (www.gvn.chateauversailles.fr) | In French | → Museums → Computer simulation |
| GVSC | Generic VHSIC Spacecraft Computer | In English | → Hardware → Spaceflight engineering, astronautics |
| GWDG | Gesellschaft für wissenschaftliche Datenverarbeitung Göttingen | In German | → Organizations and associations |
| GWT | Google Widget Toolkit | In English | → Software → Networks, communication |
| HAL | Houston Aerospace Language | In English | → Programming languages |
| HAL | High-order Assembly Language | In English | → Programming languages |
| HALS | High-order Programming Language for Spacelab usage | In English | → Programming languages |
| HAP | High-Speed Arithmetic Processor | In English | → Hardware → Mathematics |
| HAP | Hardware Allocation Panel | In English | → Hardware |
| HC | Hybrid Computer | In English | → Hardware |
| HCCB | Hardware Configuration Control Board | In English | → Hardware |
| HCR | Handprint Character Recognition | In English | → Writing systems → Computer-based techniques |
| HCRB | Hardware Configuration Review Board | In English | → Hardware |
| HCSL | Hybrid Computation and Simulation Laboratory | In English | → Research institutes → Computer simulation |
| HDA | Hardware Disposition Area | In English | → Hardware |
| HDDR | High-Density Digital Recorder | In English | → Data |
| HDL | Haifa Development Lab | In English | |
| HDR | High Data Rate | In English | → Data |
| HDRA | High-Data-Rate Assembly | In English | → Data |
| HDRI | High Dynamic Range Imaging | In English | → Image processing |
| HDRM | High-Data-Rate Multiplexer | In English | → Data |
| HDRR | High-Data-Rate Recorder | In English | → Data |
| HDRS | High-Data-Rate System | In English | → Data |
| HDRSS | High-Data-Rate Storage System | In English | → Data |
| HDS | Hardware Description Sheet | In English | → Hardware |
| HE | Hardware Evaluation | In English | → Hardware |
| HE | Hardware Evaluator | In English | → Hardware |
| HEDSIM | High Endoatmospheric Event-Based Simulation | In English | → Computer simulation |
| HEDSIM | High Endoatmospheric Defense System Simulator | In English | → Computer simulation → Military engineering |
| HELM | Hypertextual Electronic Library of Mathematics | In English | → Libraries → Data → Mathematics |
| HESS | High-Energy Squib Simulator | In English | → Computer simulation → Physics |
| HFES | Human Factors and Ergonomics Society | In English | → Organizations and associations → Human-computer interaction |
| HIC | Hardware Integration Contractor | In English | → Hardware |
| HID | Hardware Interface Device | In English | → Hardware → Human-computer interaction |
| HID | HIM Interface Distributor | In English | → Human-computer interaction |
| HIL | Hardware In Loop | In English | → Hardware |
| HILS | Hardware-In-The-Loop Simulation | In English | → Hardware |
| HIM | Hardware Interface Module | In English | → Hardware → Human-computer interaction |
| HIP | Hardware Interface Program | In English | → Hardware → Human-computer interaction |
| HIP | Hardware Interface Processor | In English | → Hardware → Human-computer interaction |
| HIP | Hardware Interface Panel | In English | → Hardware → Human-computer interaction |
| HIPO | Hierarchical Input-Process Output | In English | |
| HISTU | Hypermediale Informationssystem für die Technische Universität Wien | In German | → Higher education, universities |
| HiWorD | HIerarchical Workflow Designer | In English | → Computer-based techniques |
| HLAL | High-Level Assembler Language | In English | → Programming languages |
| HLTL | High-Level Test Language | In English | → Programming languages |
| HMU | Hardware Mockup | In English | → Hardware |
| HOL | High-Order Language | In English | → Programming languages |
| HOLAP | Hybrid On Line Analytical Processing | In English | → Knowledge management → Data |
| HOLC | High-Order Language Computer | In English | → Hardware → Programming languages |
| HON | Health On the Net | In English | → Networks, communication → Medicine |
| HOS | Hybrid Operating System | In English | → Operating systems |
| HOS | High-Order Software | In English | → Software |
| HP | Hewlett-Packard | In English | |
| HP | Hewlett Packard | In English | → Hardware |
| HP-EIC | Hewlett-Packard European Innovation Centre | In English | |
| HPC | High Performance Computing | In English | |
| HPGL | Hewlett-Packard Graphics Language | In English | |
| HR-XML | Human Resources eXtensible Markup Language | In English | → Programming languages → Personnel management → Labour, labour economics |
| HRDA | High-Rate Data Assembly | In English | |
| HRDR | High-Rate Digital Recorder | In English | |
| HRE | Hardware Reuse Evaluation | In English | → Hardware |
| HRI | Human Rights Internet | In English | → Networks, communication → Fundamental rights |
| HRL | Haifa Research Lab | In English | |
| HSC | Hardware and Software Coordination | In English | → Hardware → Software |
| HSD | High-Speed Data | In English | → Data |
| HSD | High-Speed Device | In English | → Hardware |
| HSDL | High-Speed Data Line | In English | → Data |
| HSL | Hardware Simulation Laboratory | In English | → Research institutes → Hardware → Computer simulation |
| HSL | Haifa Software Lab | In English | → Software |
| HSP | High-Speed Printer | In English | → Peripheral devices |
| HSR | Hardware Status Register | In English | → Hardware |
| HSR | High Speed Reader | In English | → Hardware |
| HSUPA | High Speed Uplink Packet Access | In English | |
| HTA | HTML Applications | In English | → Software |
| HTC | Hybrid Technology Computer | In English | → Hardware |
| HTLL | High-Test-Level Language | In English | → Programming languages |
| HTML | HyperText Markup Language | In English | → Programming languages → Data |
| HTML | Hyper Text Markup Language | In English | → Data → Networks, communication → Document processing |
| HTTP | HyperText Transfer Protocol | In English | → Internet |
| HUD | Head-Up Display | In English | → Human-computer interaction |
| HUL | Hardware Utilization List | In English | → Hardware |
| HULL | Hardware Utilization and Location List | In English | → Hardware |
| HUTSIM | Helsinki University of Technology Simulator | In English | → Computer simulation |
| HVD | Holographic Versatile Disc | In English | → Memories → Data |
| HW | Hardware | In English | → Hardware |
| HW/SW | Hardware/Software | In English | |
| HWCI | Hardware Configuration Item | In English | → Hardware |
| HWIL | Hardware In Loop | In English | → Hardware |
| HYDAC | Hybrid Digital-Analog Computer | In English | → Hardware |
| I3C | Internet Créatif, Coopératif et Citoyen | In French | → Internet |
| I3S | (Laboratoire d')Informatique, Signaux et Systèmes de Sophia Antipolis | In French | → Research institutes → Telecommunications |
| IA | Intelligència artificial = AI | Artificial Intelligence | In English = AI | Artificiële Intelligentie | In Dutch = KI | Kunstmatige Intelligentie | In Dutch = VI | Vještačka inteligencija | In Bosnian = KI | Künstliche Intelligenz | In German = AI | Artefarita Inteligenteco | In Esperanto = IA | Intelligence Artificielle | In French |
In Catalan | → Artificial intelligence |
| IA | Intelligence Artificielle = AI, KI, VI (look above) |
In French | → Artificial intelligence |
| IA | Interface Agreement | In English | → Human-computer interaction |
| IAD | Interface Analysis Document | In English | → Human-computer interaction |
| IAD | Interface Agreement Document | In English | → Human-computer interaction |
| IAF | Internet Access Facilities | In English | → Internet → Telecommunications |
| IAH | Interface Attachment Hardware | In English | → Hardware → Human-computer interaction |
| IAI | Institut Africain d'Informatique | In French | → Specialized or (poly)technical colleges |
| IAIK | Institut für Angewandte Informationsverarbeitung und Kommunikationstechnologie (www.iaik.tugraz.at) | In German | → Telecommunications |
| IAN | Institutional Area Network | In English | → Networks, communication |
| IANIS | Innovative Actions Network for the Information Society | In English | → Telecommunications |
| IAO | Ingénierie Assistée par Ordinateur | In French | → Computer-based techniques → Engineering, technology |
| IAS | Interface d'Authentification Serveur | In French | → Networks, communication → Telecommunications |
| IAS | Identification, Authentification et Signature | In French | → Telecommunications |
| IASSP | IEEE (Institute of Electrical and Electronics Engineers) ASSP Magazine | In English | → Serial publications, periodicals → Software |
| IBISC | Informatique, Biologie Intégrative et Systèmes Complexes | In French | → Biological sciences |
| IBM | International Business Machines (Corporation) | In English | → Hardware |
| IBM | International Business Machines | In English | |
| IBMJ | IBM Journal Research Development | In English | → Serial publications, periodicals |
| IC | Intercomputer Communication | In English | → Networks, communication |
| IC | Intercommunications | In English | → Networks, communication → Telecommunications |
| ICA | Intelligent Communicating Agent | In English | |
| ICAAD | Interactive Computer-Aided Analysis and Design | In English | → Computer-based techniques |
| 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 |
| 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 → 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 | → United Nations |
| ICC | Interface Control Chart | In English | → Human-computer interaction |
| ICC | Intercomputer Channel | In English | → Networks, communication |
| ICC | Interface Control Contractor | In English | → Human-computer interaction |
| ICC | Intercomputer Communication | In English | → Networks, communication |
| ICCHP | International Conference on Computers Helping People with Special Needs | In English | → Congresses → Computer-based techniques |
| 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 |
| ICI | Institutul Naţional de Cercetare-Dezvoltare în Informatică | In Romanian | |
| ICI | Information, Coordination, Incitation | In French | |
| ICIE | Institute for Communications and Information Engineering | In English | → Telecommunications |
| ICL | Interface Control Layout | In English | → Human-computer interaction |
| 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 |
| 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 |
| ICOS | Integrated Cargo Operating Software | In English | → Software → Transport and postal services |
| ICP | Interface Change Proposal | In English | → Networks, communication |
| ICP | Interface Control Panel | In English | → Networks, communication |
| ICR | Interface Compatibility Record | In English | → Networks, communication |
| ICR | Intelligent Character Recognition | In English | → Writing systems → Computer-based techniques |
| ICRA | Association de Classification du Contenu de l'Internet | In French | → Internet → Libraries → Associations |
| ICRA | Internet Content Rating Association | In English | → Internet → Organizations and associations |
| ICRB | Interface Change Review Board | In English | → Networks, communication |
| 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 |
| ICSE | Impact of Computing in Science and Engineering | In English | → Serial publications, periodicals → 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 | → Telecommunications |
| ICT | Information and Communications Technology = TIC, IKT, TMK (look above) |
In English | → Telecommunications |
| ICTP | Institutul de Calcul Tiberiu Popoviciu | In Romanian | → 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 | Intermediate Data Array | In English | → Data |
| IDA | Integrated Display Assembly | In English | → Human-computer interaction → Electronics |
| IDA | Interface Definition Agreement | In English | → Human-computer interaction |
| 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 | Interface Document Control | In English | → Human-computer interaction |
| IDC | IMBLMS Digital Computer | In English | → Hardware |
| IDD | IGS Data Denial | In English | → Data |
| IDD | Interface Description Document | In English | → Human-computer interaction |
| IDD | Interface Design Document | In English | → Human-computer interaction |
| IDD | Interface Definition Document | In English | → Human-computer interaction |
| IDD | Integrated Data Denial | In English | → Data |
| 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 |
| IDIST | Formation et Recherche en Sciences de l'Information et du Document | In French | → Document processing → Knowledge management → Libraries |
| IDL | Interface Description Language | In English | → Programming languages → Human-computer interaction |
| IDMC | Independent Data-Monitoring Committee | In English | → Data |
| IDMS | Information and Data Management System | In English | → Data → Knowledge management |
| IDN | Internationalized Domain Name | In English | → Networks, communication |
| IDOS | Integrated Display Operating System | In English | → Operating systems |