| Abbreviation | Definition |
|---|---|
| IFRC | Impact Finance Research Consortium |
| IFRC | International Franchise Research Centre |
| IFRC | International Fusion Research Council |
| IFRS | International Fibrinogen Research Society |
| IFSSD | International Federation of Societies on Skeletal Diseases |
| IFTR | International Federation for Theater Research |
| IFTR | International Federation for Theatre Research |
| IFTR | International Federation of Theatre Research |
| IGES | Institute for Global Environmental Strategies |
| IGF | Insulin-like growth factor |
| IGFR | Insulin-like growth factor receptor |
| IGFRI | Indian Grassland and Fodder Research Institute |
| IGHR | Instititute of Genealogy and Historical Research |
| IGHR | Institute for Genealogical and Historical Research |
| IGHR | Institute of Genealogical and Historical Research |
| IGIDR | Indira Gandhi Institute of Development Research |
| IGRA | International Guitar Research Archives |
| IGRE | Institute for Geospatial Research and Education |
| IGRM | Irish Geological Research Meeting (Ireland) |
| IGRS | Irish Genealogical Research Society |