| Abbreviation | Definition |
|---|---|
| ITRC | International Training and Research Center |
| ITRC | International Tuberculosis Research Center |
| ITRC | International Turfgrass Research Conference |
| ITRC | Iran Telecom Research Center |
| ITRC | Iran Telecommunication Research Center |
| ITRI | Industrial Technology Research Institute |
| ITRI | Information Technology Research Institute |
| ITRL | Ideation Triz Research Lab |
| ITRL | Integrated Transport Research Lab |
| ITRP | Industrial Transformation Research Program |
| ITRS | Industrial Ties Research Subprogram |
| ITSR | Institute for Trade Studies and Research |
| ITSR | Institute for Trade Studies Research |
| ITSR | Institute of Tribal Studies and Research |
| IUFRO | International Union of Forest Research Organizations |
| IVCR | In Vivo Clinical Research |
| IVRG | Information Visualisation Research Group |
| IVRG | Information Visualization Research Group |
| IVRG | Insect Virus Research Group |
| IWASRI | International Waterlogging and Salinity Research Institute |