| installatore | fitter |
| installatrice | fitter |
| installazione | installation |
| installazione a alto rischio | major risk installation |
| installazione chimica | chemical installation |
| installazione industriale | industrial installation |
| installazione per trivellazione | drilling installation |
| installazione pericolosa | dangerous installation |
| installazione soggetta ad approvazione | installation requiring approval |
| instancabile | tireless |
| Instant Star | Instant Star |
| instante | petitioner |
| instillare | instill |
| instillazione | instillation |
| Institore | Solicitor |
| Institut de droit international | Institut de Droit International |
| Institut de France | Institut de France |
| Institut géographique national | Institut Géographique National |
| Institut national de la statistique et des études économiques | INSEE |
| Institut national de recherche en informatique et en automatique | Institut national de recherche en informatique et en automatique |
| Institut Royal de la Culture Amazighe | Royal institute of the Amazigh culture |
| Institute for Advanced Study | Institute for Advanced Study |
| Institute of Electrical and Electronics Engineers | Institute of Electrical and Electronics Engineers |
| Instituto Brasileiro de Geografia e Estatística | Brazilian Institute of Geography and Statistics |
| Instituto Nacional de Estadística y Censos | National Institute of Statistics and Census of Argentina |
| Instituzione | Institution |
| instradamento | routing |
| Instruction level parallelism | Instruction level parallelism |
| Instructional Design | Instructional design |
| insubordinato | disobedient |
| insubordinazione | insubordination |
| Insubri | Insubres |
| Insubria | Insubria |
| insuccesso | failure |
| insudiciare | blacken |
| insudiciato | soils |
| insufficiente | deficient |
| insufficienza | deficiency |
| Insufficienza epatica fulminante | Acute liver failure |
| Insula | Insulae |
| insulare | insular |
| Insulated Gate Bipolar Transistor | Insulated-gate bipolar transistor |
| insulina | insulin |
