| Abbreviation | Definition |
|---|---|
| INPE | Instituto National de Pesquisas Espaciais |
| INPI | Instituto Nacional Propiedad Industrial |
| INR | Institute of Nuclear Research |
| INRA | Instituto Nacional de Reforama Garana |
| INRB | Institut National de Recherche Biologique |
| INRF | Integrated Nanosystems Research Facility |
| INRIA | Institut National de Recherche en Informatique et en Automatique |
| INRP | Interdisciplinary Neuroscience Research Program |
| INRR | Institute of Natural and Regional Resources |
| INRS | Institut National de la Recherche Scientifique |
| INRW | INtegrated Reading and Writing courses |
| INS | Independent Novel Study |
| INS | Institute for Nuclear Study |
| INSEAD | INStitut Européen d'ADministration des affaires (European Institute of Business Administration) |
| INSPIRE | Interstate Network of Science Programs Integrating Research and Education |
| INSS | Institute for National Security Studies |
| INST | Institute |
| INSTRAW | INternational ReSearch and TRaining Institute for the Advancement of Women |
| INTAC | International Academy of Cincinnati |
| INU | International Network of Universities |