| Abbreviation | Definition |
|---|---|
| IREI | Island Research Educational Initiative |
| IRENE | Institute for Research and Education on Negotiation in Europe |
| IREP | Institutional Research Effectiveness and Planning |
| IRES | International Research and Educational Society |
| IRFC | Independent Research Fellows Cohort |
| IRG | Ideographic Research Group |
| IRG | Implementation Research Group |
| IRG | Independent Researchers Group |
| IRG | Institutional Research Grant |
| IRG | Internet Research Group |
| IRGC | International Research Group on Charophytes |
| IRGI | Inveresk Research Group Inc |
| IRGP | Internal Research Grant Program |
| IRGP | International Research Grant Program |
| IRGR | International Research Group on Reintegration |
| IRHS | Interdisciplinary Research in the Humanities and Science |
| IRIC | Institute for Research in Immunology and Cancer |
| IRIC | Integrated Research and Innovation Center |
| IRIMS | Industrial Research Institute Member Summit |
| IRIS | Innovative Research and Integrated Sensing |