| Acronym | Meaning |
 | IMPT | Institute Of Maxillofacial Prosthetists And Technologists |
| IMR | Inzhenernaya Mashina Razgrazhdeniya (Russian ?????????? ?????? ???????????? |
| IMRI | Industrial Membrane Research Institute - Information Management Research Institute - Institut Pour Le Management De La Recherche Et De L?innovation (French |
| IMRL | Individual Material Readiness List |
| IMRO | Irish Music Rights Organisation |
| IMS | Information Management System - International Meat Secretariat - Ion Mobility Spectrometer |
| IMSA | Illinois Mathematics And Science Academy - International Mind Sports Association - International Motor Sports Association |
| IMT | Integrated Management Tool |
| IMU | International Mathematical Union |
| IN | India (FIPS 10-4 Country Code; ISO 3166 Digram) - Indiana (postal Symbol) - Infantry |
| IN | Indium |
| IN TRANS. | In Transitu (Latin |
| INA | Interlingua Language (ISO 639-2 Code) |
| INAS | International Near-Earth Asteroid Survey |
| INC | Iglesia Ni Cristo (Filipino |
| INCITS | InterNational Committee For Information Technology Standards |
| IND | India (ISO 3166 Trigram) |
| IND | Indonesian Language (ISO 639-2 Code) |
| INDIGO | (U.S.) INtelligence DIvision Gaming Operation |
| INFORMS | (U.S.) Institute For Operations Research And The Management Sciences |
| INFOSEC | Information Security |
| INLA | Irish National Liberation Army |
| INMARSAT | International Maritime Satellite Organization |
| INR | Indian Rupee (ISO 4217 Currency Code) |
| INRI | Iesus Nazarenus Rex Iud?orum (Latin |
| INRIA | Institut National De Recherche En Informatique Et En Automatique |
| INSAR | Interferometric Synthetic Aperture Radar |
| INST | Information Standards And Technology |
| INTERFET | International Force For East Timor |
| INTSUM | Intelligence Summary |
| IO | British Indian Ocean Territory (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| IO | Ido Language (ISO 639-1 Code) |
| IOC | Initial Operational Capability - Intergovernmental Oceanic Commission - International Olympic Committee - International Ornithological Congress |
| IOM | Iowa |
| IONA | Islands Of The North Atlantic (alternate Name For Great Britain |
| IOT | British Indian Ocean Territory (ISO 3166 Trigram) |
| IOT&E | Integrated Operational Test And Evaluation |
| IP | Clipperton Island (FIPS 10-4 Territory Code) -Initial Point - Intellectual Property - Internet Protocol |
| IPA | India Pale Ale - International Phonetic Alphabet - Isopropyl Alcohol |
| IPB | Intelligence Preparation Of The Battlefield |
| IPCC | Intergovernmental Panel On Climate Change |
| IPK | Inupiaq Language (ISO 639-2 Code) |
| IPL | Inferior Parietal Lobule |
| IPN | Instytut Pamieci Narodowej (Polish |
| IPO | Initial Public Offering |
| IPR | In Progress Review - Intellectual Property Rights - Intelligence Production Requirement |
| IPT | Integrated Product/Project Team |
| IPTS | Institute For Prospective Technological Studies |
| IPTV | Internet Protocol TeleVision |
| IPW | Interrogation Of Prisoners Of War |
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