| Abbreviation | Definition |
|---|---|
| IGSA | Independence Girls Softball Association |
| IGSA | Indian Grad Student Association |
| IGSA | Indian Graduate Student Association |
| IGSA | Indian Graduate Students Association |
| IGSA | Indigenous Graduate Student Association |
| IGSA | Informatics Graduate Student Association |
| IGSA | Interior Girls Softball Association |
| IGSA | International Graduate Student Association |
| IGSA | Iranian Graduate Students Association |
| IGSA | Irvine Girls Softball Association |
| IGUA | Industrial Gas Users Association |
| IHA | Independence Hall Association |
| IHA | Independent Health Association |
| IHA | International Housewares Association |
| IHA | International Hyperbarics Association |
| IHA | International Hypnosis Association |
| IHA | Islip Horsemen's Association |
| IHCA | Idaho Health Care Association |
| IHCA | Illinois Health Care Association |
| IHCA | Indiana Health Care Association |