| Abbreviation | Definition |
|---|---|
| IFTA | International Fruit Tree Association |
| IGA | Independent Glass Association |
| IGA | INternational Glove Association |
| IGA | International Goat Association |
| IGAS | Irish Graduates Association of Singapore |
| IGDA | International Game Developer Association |
| IGDA | International Games Developers Association |
| IGDA | International Grown Diamond Association |
| IGFA | Idaho Guardian and Fiduciary Association |
| IGFA | International Game and Fish Association |
| IGFA | International Graphic Fairtrade Association |
| IGIA | Illinois Green Industry Association |
| IGIA | Iowa Grocery Industry Association |
| IGLA | Island Green Living Association |
| IGMAA | International Gas Model Airplane Association |
| IGPA | Idaho Grain Producers Association |
| IGPA | International General Produce Association |
| IGPA | International Golf Psychology Association |
| IGRA | Israel Genealogy Research Association |
| IGSA | Immunology Graduate Students Association |