| Abbreviation | Definition |
|---|---|
| IAGR | International Association for Gondwana Research |
| IAIR | Illinois Association for Institutional Research |
| IAR | Institute for Agricultural Research |
| IAR | Institutional Assessment and Research |
| IARA | International Aerosol Research Assembly |
| IARC | Illinois Accelerator Research Center |
| IARC | Internal Agency for Research on Cancer |
| IARC | International Agency for Research on Cancer (World Health Organization) |
| IARC | International Agricultural Research Center |
| IARG | Information Assurance Research Group |
| IARG | Iwany Acoustics Research Group |
| IARI | Indian Agriculture Research Institute |
| IARI | Integrated Arts Research Initiative |
| IARO | Individual Advanced Research Opportunities |
| IARO | Iranian Agricultural Research Organization |
| IARP | International Aging Research Portfolio |
| IARP | International Anthropomorphic Research Project |
| IARPA | Intelligence Advanced Research Project Activity |
| IARS | International Atherosclerosis Research School |
| IASPRR | International Association of Sexual Plant Reproduction Research |