| Abbreviation | Definition |
|---|---|
| IRET | Institute of Real Estate Training |
| IRET | Institute of Rehabilitation Education and Training |
| IRF | Institute For Regional Forecasting |
| IRFS | Institute for Reporters Freedom and Safety |
| IRG | Institute for Reforming Government |
| IRH | Institute for Reproductive Health |
| IRH | Institute for Research in the Humanities |
| IRH | Institute for Restorative Health |
| IRH | Institute for Rural Health |
| IRH | Institute of Rural Health |
| IRHS | Institute For Rural Health Studies |
| IRI | Implementation Research Institute |
| IRI | Industrial Research Institute |
| IRI | Initiative and Referendum Institute |
| IRI | Insured Retirement Institute |
| IRI | International Renewal Institute |
| IRI | International Research Institute |
| IRIC | Institute for Research in Immunology and Cancer |
| IRIC | International Relations Institute of Cameroon |
| IRICP | International Research Institute for Climate Prediction |