| IMR | Infant Mortality Rate = ММВБ | Московская межбанковская валютная биржа | In Russian = MICEX | Moscow Interbank Currency Exchange | In English = МБВБ | Мускав банксен валютă биржи | In Chuvash = AKB | Angka Kematian Bayi | In Indonesian = TMI | Taxa de Mortalidade Infantil | In Portuguese = TMI | Taux de Mortalité Infantile | In French = TMI | Taxa de Mortalitat Infantil | In Catalan |
In English | → Statistics → Pediatry |
| IMRB | Interim Mission Reconfiguration Base | In English | |
| IMRO | Inspection, Modification, and Repair Order | In English | |
| IMRSA | International Medical Regulatory and Shipping Association | In English | → Associations → Medicine |
| IMRv | International Materials Reviews | In English | → Serial publications, periodicals → Materials science |
| IMS | National Museums of Scotland | In English | → Museums |
| IMS | Inhibit Main Store | In English | |
| IMS | Indian Missionary Society | In English | → Roman catholic church |
| IMS | Interplanetary Monitor Satellite | In English | → Astronomy → Spaceflight engineering, astronautics |
| IMS | Inventory Management System | In English | → Knowledge management |
| IMS | Information Management System | In English | → Knowledge management |
| IMS | IP Multimedia Subsystem | In English | → Telecommunications → Computer science |
| IMS | Institute for Molecular Science | In English | → Research institutes → Biochemistry, biophysics |
| IMSI | International Mobile Subscriber Identity | In English | → Telecommunications |
| IMSI | Intracytoplasmic Magnified Sperm Injection | In English | → Reproductive biology |
| IMSO | International Mobile Satellite Organization | In English | → Associations → Spaceflight engineering, astronautics → Telecommunications |
| IMSS | In-Flight Medical Supply System | In English | → Medicine → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| IMST | Integrated Mission Simulation Test | In English | |
| IMST3 | Innovation in Mathematics, Science and Technology Teaching | In English | → Education → Mathematics and natural sciences → Mathematics → Engineering, technology |
| IMT | Intima Media Thickness = EIM | Espace Intima Média | In French |
In English | → Blood and circulatory system → Cardiology |
| IMTF | Integrated Manufacturing Test Facility | In English | |
| IMU | Inertial Measurement Unit | In English | |
| IMUGSE | IMU Ground Support Equipment | In English | |
| IMUPLM | Inertial Measurement Unit Prelaunch Monitor | In English | |
| IMW | Intelligent Machining Work Station | In English | |
| IMW | Indonesia and the Malay World | In English | → Area studies |
| INA | International Nanoplankton Association | In English | → Associations → Marine research, oceanography → Palaeontology → Zoology |
| INA | Integrated Network Analyzer | In English | → Networks, communication |
| INAHTA | International Network of Health Technology Assessment | In English | |
| INALCO | Institut National des Langues et Civilisations Orientales (www.inalco.fr) | In English | → Higher education, universities → Language, linguistics, literature |
| INAP | Intelligent Network Application Part | In English | → Networks, communication → Telecommunications |
| InASP | Indian Academy of Sciences Proceedings | In English | → Serial publications, periodicals → Mathematics and natural sciences |
| INBO | International Network of Basin Organizations | In English | → 341224 → Hydrology → 626 → Engineering, technology |
| INC | Installation Notice Card | In English | |
| INC | Installation Notification Certificate | In English | |
| INCA | International Newspaper Colour Association | In English | → Associations → Newspapers, journalism → Graphic industries, printing, publishing |
| InCh | Inorganic Chemistry | In English | → Serial publications, periodicals → Inorganic chemistry |
| INCITS | International Committee for Information Technology Standards | In English | → Standardization → Computer science → Telecommunications |
| InCo | Information and Computation | In English | → Serial publications, periodicals → Computer science |
| INCO | Instrumentation and Communication Officer | In English | |
| INCO | Integrated Communications Officer | In English | → 653 |
| INCOPA | Inorganic Coagulants Producers Association (www.incopa.org) | In English | → Associations → Chemicals |
| INCPEC | Indonesian National Committee for Pacific Economic Cooperation | In English | → Economics |
| IND | Investigational New Drug | In English | → Pharmacology, toxicology |
| IND | Investigational New Drug (application) | In English | → Pharmacology, toxicology |
| INDAT | Incoming Data | In English | |
| InEPS | Indian Academy of Sciences Proceedings: Earth and Planetary Sciences | In English | → Serial publications, periodicals → Astronomy → Earth sciences |
| InES | Indian Academy of Sciences Proceedings: Engineering Sciences | In English | → Serial publications, periodicals → Engineering, technology |
| INES | International Nuclear Event Scale | In English | → Nuclear technology |
| INESASS | Institute of National Economy - Shanghai Academy of Social Sciences | In English | → Research institutes → Economics |
| InfCo | Information Control | In English | → Serial publications, periodicals → Computer science |
| InfD | Information Display | In English | → Serial publications, periodicals → Computer science |
| InFer | Integrated Ferroelectrics | In English | → Serial publications, periodicals → Electrical engineering |
| InfPh | Infrared Physics | In English | → Serial publications, periodicals → Physics |
| INFRAWEBS | Intelligent Framework for Generating Open (Adaptable) Development Platforms for Web - Service Enabled Applications | In English | → Software → Internet → Telecommunications |
| InGeo | International Geophysics Series | In English | → Serial publications, periodicals → Geophysics |
| INIS | International Nuclear Information System | In English | → Nuclear technology |
| InISA | Indian Institute of Science - Journal of Aeronomical Society of India | In English | → Serial publications, periodicals → Mathematics and natural sciences |
| InISJ | Indian Institute of Science Journal | In English | → Serial publications, periodicals → Mathematics and natural sciences |
| INITCO | Initialization and Checkout | In English | |
| INIVE | International Network for Information on Ventilation | In English | |
| InJAE | Indian Journal of Aerospace Engineering Division | In English | → Serial publications, periodicals → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| InJBB | Indian Journal of Biochemistry and Biophysics | In English | → Serial publications, periodicals → Biochemistry, biophysics |
| InJME | Indian Journal of Mechanical Engineering Division | In English | → Serial publications, periodicals → Mechanical engineering |
| InJP | Indian Journal of Physics and Proceedings of the Indian Assocatiation for the Cultivation of Science | In English | → Serial publications, periodicals → Mathematics and natural sciences → Physics |
| InJTP | Indian Journal of Theoretical Physics | In English | → Serial publications, periodicals → Physics |
| INK | Imprinting Neuro-Kinesiology = INK | Impression Neuro-Kinésiologique | In French |
In English | → Psychology |
| INMARSAT | International Maritime Satellite | In English | → Marine research, oceanography → Spaceflight engineering, astronautics |
| InMS | Indian Academy of Sciences Proceedings: Mathematical Sciences | In English | → Serial publications, periodicals → Mathematics |
| INN | International Nonproprietary Name = DCI | Dénomination Commune Internationale | In French = DCI | Denominación Común Internacional | In Spanish = DCI | Denominazione Comune Internazionale | In Italian = МНН | Международное непатентованное название | In Russian |
In English | → Pharmacology, toxicology |
| INPADOCDB | International Patent Documentation Data Base | In English | → Libraries → Industrial property |
| INPAREL | Institute for the Study of Indo-Pakistan Relations | In English | → International relations |
| InPhT | Infrared Physics and Technology | In English | → Serial publications, periodicals → Physics |
| INPMA | Institut National des Plantes Médicinales et Aromatiques | In English | → Research institutes → Biological sciences → Pharmacology, toxicology → Agricultural sciences |
| INR | International Normalized Ratio | In English | |
| INR | Inertial Reference | In English | |
| INS | Inertial Navigation System | In English | |
| INSAP | Indian National Science Academy Proceedings Supplement | In English | → Serial publications, periodicals → Mathematics and natural sciences |
| INSAT | India Communications Satellite | In English | → Spaceflight engineering, astronautics → Telecommunications |
| INSTAAR | Institute of Arctic and Alpine Research | In English | → Earth sciences |
| INSTAC | Information Technology Research and Standardization Center | In English | → Computer science → Telecommunications |
| INSTRAW | (United Nations) International Research and Training Institute for the Advancement of Women | In English | → United Nations → Feminism |
| INT | Integrated Test | In English | |
| INTAP | Interoperability Technology Association for Information Processing | In English | → Associations → Telecommunications → Computer-based techniques |
| INTBO | International Network of Transboundary Basin Organizations | In English | → 341224 → Hydrology → 626 → Engineering, technology |
| INTEC | Independent Terminal Testing and Certification Consortium | In English | → Quality management |
| INTEC | International Netcourse Teacher Enhancement Coalition | In English | → Organizations and associations → Education |
| InTEEC | Information Technology and Electrical Engineering Consultant | In English | → Computer science → Electrical engineering → Consulting |
| INTELSAT | International Telecommunications Satellite | In English | → Spaceflight engineering, astronautics → Telecommunications |
| INTERLAND | Innovative Technologies for Remediation of Landfills and Contaminated Soils | In English | → Nature → Environment, environmental sciences → Biotechnology → Agricultural sciences |
| INTF | Interim National Test Facility | In English | |
| INTOSAI | International Organization of Supreme Audit Institutions | In English | → Organizations and associations → Accounting → 659 |
| IntSM | Interavia Space Markets | In English | → Serial publications, periodicals → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| InvPr | Inverse Problems | In English | → Serial publications, periodicals → Mathematics |
| IO | Industrial Operations | In English | → 33854 |
| IO | Information Orientation | In English | |
| IO | Input/Output | In English | → Computer science → Engineering, technology |
| IOA | Input/Output Adapter | In English | → Data |
| IOA | Input, Output, or Assembly | In English | |
| IOB | Input/Output Box | In English | → Hardware → Data |
| IOB | Input/Output Buffer | In English | → Data |
| IOB | Input/Output Bus | In English | → Data |
| IOB | Institute of Biology | In English | → Research institutes → Biological sciences |
| IOBM | In Ocean By Mistake | In English | → Spaceflight engineering, astronautics |
| IOBPS | Input/Output Box and Peripheral Simulator | In English | → Hardware → Data |
| IOC | Input/Output Controller | In English | → Data |
| IOC | Indirect Operating Cost | In English | → Prices |
| IOC | Integrated Operations Configuration | In English | |
| IOC | Initial Operational Capability | In English | |
| IOC | Item of Concern | In English | |
| IOC | In-Orbit Checkout and Calibration | In English | → Spaceflight engineering, astronautics |
| IOC | International Olympic Committee (www.olympic.org) = CIO | Comité International Olympique | In French = МОК | Международен олимпийски комитет | In Bulgarian = MOO | Međunarodni olimpijski odbor | In Bosnian = COI | Comitè Olímpic Internacional | In Catalan = MOV | Mezinárodní olympijský výbor | In Czech = IOK | Internationales Olympisches Komitee | In German = ΔΟΕ | Διεθνής Ολυμπιακή Επιτροπή | In Greek = IOK | Internacia Olimpika Komitato | In Esperanto = COI | Comité Olímpico Internacional | In Spanish = ROK | Rahvusvaheline Olümpiakomitee | In Estonian = KOK | Kansainvälinen olympiakomitea | In Finnish = COI | Comité Olímpico Internacional | In Galician = MOO | Međunarodni olimpijski odbor | In Croatian = NOB | Nemzetközi Olimpiai Bizottság | In Hungarian = TOK | Tarptautinis olimpinis komitetas | In Lithuanian = IOC | Internationaal Olympisch Comité | In Dutch = IOK | (Den) internasjonale olympiske komité | In Norwegian = MKOI | Międzynarodowy Komitet Olimpijski | In Polish = COI | Comité Olímpico Internacional | In Portuguese = МОК | Международный олимпийский комитет | In Russian = MOK | Međunarodni olimpijski komitet | In Serbo-Croatian = MOV | Medzinárodný olympijský výbor | In Slovak = MOK | Mednarodni olimpijski komite | In Slovenian = МОК | Међународни олимпијски комитет | In Serbian = IOK | Internationella Olympiska Kommitté | In Swedish = МОК | Міжнародний олімпійський комітет | In Ukrainian |
In English | → Organizations and associations → Sport, physical exercises |
| IOC | Intergovernmental Oceanographic Commission (http://ioc.unesco.org) | In English | → International relations → Marine research, oceanography |
| IOC | Indian Ocean Commission (www.coi-ioc.org) = COI | Commission de l'Océan Indien | In French |
In English | → International relations |
| IOCP | ITS On-Board Computer Program | In English | → Software |
| IOCU | Input/Output Control Unit | In English | |
| IOD | Initial Orbit Determination | In English | → Spaceflight engineering, astronautics |
| IODP | Integrated Ocean Drilling Project | In English | → Marine research, oceanography |
| IODT | Integrated Ontology Development Toolkit | In English | → Programming languages → Data → Linguistics |
| IOE | Input/Output Error | In English | |
| IOF | Initial Operational Flight | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| IOHA | Integrated Operating Hazard Analysis | In English | |
| IOL | Interoffice Letter | In English | |
| IOLM | International Organization of Legal Metrology | In English | → Organizations and associations → Standardization |
| IOM | International Organization for Migration | In English | → Organizations and associations → Migrations |
| IOM | Interoceanmetal Joint Organization | In English | → Organizations and associations → Marine research, oceanography → Mining |
| IOM | Input/Output Module | In English | → Data |
| IOMA | Italian Online Movie Awards | In English | → Cinema, movies |
| IOMAC | Indian Ocean Marine Affairs Cooperation | In English | → International relations → Marine research, oceanography → Fishing, hunting |
| IONDS | Integrated Operational Nuclear Detection System | In English | → Nuclear technology |
| IOP | Input/Output Part | In English | → Data |
| IOP | Input/Output Processor | In English | → Hardware → Data |
| IoP | Institute of Physics | In English | → Physics |
| IOP | International Organisation of Palaeobotany | In English | → Organizations and associations → Paleobotany, palynology |
| IOPL | Integrated Open-Problem List | In English | |
| IOPT | Input/Output Parameter Table | In English | → Data |
| IOQE | Input/Output Queue Element | In English | → Data |
| IOQS | International Organization of Qumran Studies | In English | → Linguistics → Archeology |
| IORL | Input/Output Requirements Language | In English | → Data |
| IORTD | Input/Output Relationships and Timing Diagram | In English | → Data |
| IOS | Input/Output Supervisor | In English | → Data |
| IOS | Instructor Operator Station | In English | |
| IOS | Indian Ocean Ship | In English | → 6295 |
| IOS | Initial Operational System | In English | |
| IOS | Israel Oriental Society | In English | → Area studies |
| IOS | Institute of Objective Studies | In English | → Social sciences |
| IOSC | Integrated Operations Support Complex | In English | |
| IOSCS | International Organization for Septuagint and Cognate Studies | In English | → Organizations and associations → Judaism → Christianity |
| IOT | Indiana Office of Technology | In English | → Engineering, technology |
| IOT | Illuminates of Thanateros | In English | → 133 |
| IOT | Indian Ocean Territory | In English | → Geography |
| IOT | Institute for Ocean Technology = ITO | Institut des Technologies Océaniques | In French |
In English | → Marine research, oceanography |
| IOT&E | Initial Operational Test and Evaluation | In English | |
| IOT&E | Integration Operational Test and Evaluation | In English | |
| IOU | Input/Output Unit | In English | → Data |
| IP | Inertial Processing | In English | |
| IP | Interfacing Processor | In English | → Hardware → Human-computer interaction |
| IP | Iron Pipe | In English | |
| IP | Impact Point | In English | |
| IP | In Plant | In English | |
| IP | Intermediate Pallet | In English | |
| IP | Instrument Payload | In English | |
| IP | Industrial Preparedness | In English | |
| IP | Instructor Pilot | In English | → Education → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| IP | Initial Point | In English | |
| IP | Intermediate Pressure | In English | |
| IP | Instrument Processor | In English | → Hardware |
| IP | Internet Protocol | In English | → Internet |
| IPA | Information-technology Promotion Agency | In English | → Computer science → Telecommunications |
| IPA | Industrial Preparedness Action | In English | |
| IPA | Intermediate-Power Amplifier | In English | |
| IPA | International Phonetic Alphabet = 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 = IFA | Internacia Fonetika Alfabeto | In Esperanto = 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 English | → Writing systems |
| IPA | Palestinian Investment Promotion Agency | In English | → 33972 |
| IPA | International Publishers' Association | In English | → Associations → Graphic industries, printing, publishing |
| IPA | Institute of Public Affairs | In English | → Politics → Public administration, government |
| IPA | Institute for Propaganda Analysis | In English | |
| IPA | International Phonetic Association | In English | → Associations → Writing systems |
| IPA | Independent Pilots Association | In English | → Associations → Aeronautics, aircraft |
| IPA | Institute for Programming research and Algorithmics | In English | → Computer science → Mathematics |
| IPA | Independent Practice Association | In English | → Associations → Medicine |
| IPA | International Powerlifting Association | In English | → Associations |
| IPA | International Psychoanalytical Association | In English | → Associations → Psychology |
| IPA | International Police Association | In English | → Associations → Police |
| IPA | India Pale Ale | In English | → Beverage industry |
| iPAC | Internet/Intranet Public Access Catalogue | In English | → Bibliography → Libraries → Networks, communication |
| IPACS | Integrated Power and Attitude Control System | In English | → Spaceflight engineering, astronautics |
| IPAD | Integrated Program for Aerospace Vehicle Design | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| IPAR | Irregular Parts Authorization Request | In English | |
| IPAS | Integrated Problem Assessment System | In English | |
| IPASA | Institute of Physics, Academia Sinica, Annual Report | In English | → Serial publications, periodicals → Physics |
| IPB | Invision Power Board | In English | → Networks, communication |
| IPB | International Peace Bureau | In English | → Organizations and associations → Polemology |
| IPB | Illuminated Push Button | In English | |
| IPB | Illustrated Parts Breakdown | In English | |
| IPBS | Isotopes in the Physical and Biomedical Sciences | In English | → Serial publications, periodicals → Radioactivity → Biological sciences → Medicine |
| IPC | Iraq Petroleum Company | In English | → 665 |
| IPC | Integrated Procurement Control | In English | |
| IPC | Intermittent Positive Control | In English | |
| IPC | International Patent Classification | In English | → Industrial property |
| IPCAA | International Pharmaceutical Congress Advisory Association | In English | → Associations → Congresses → Pharmacology, toxicology |
|