| Abbreviation | Definition |
|---|---|
| IAESTE | International Association for the Exchange of Students for Technical Experiences |
| IAHS | International Academy for Homeland Security |
| IAMUS | International Association of Maritime Universities Students |
| IAPSRS | Imam Ali Popular Students Relief Society |
| IAPSS | International Association of Political Science Students |
| IASA | Indian American Student Association |
| IASA | Internal Audit Student Association |
| IASA | International American Student Alliance |
| IASA | Irish Aviation Students Association |
| IASC | Illinois Association of Student Councils |
| IASC | Indiana Association of Student Councils |
| IASIS | International Association of Student Insurance Services |
| IASS | Indigenous Australian Student Services |
| IASS | International Admissions and Student Services |
| IBSA | International Business Student Association |
| IBSA | International Business Students Association |
| ICR | Intensive care unit |
| ICSC | International Center Student Council |
| IDEA | Institute for Democratic Education in America |
| IDEAS | Integrated Distance Education for Adult Students |