| Abbreviation | Definition |
|---|---|
| IWL | Institute Warranty Limits |
| IWM | Institute of Water Modelling |
| IWP | Institute for Women in Politics |
| IWS | Institute for Watershed Studies |
| IWS | Institute for Wildlife Studies |
| IWS | Institute for Workplace Studies |
| IWS | Institute For Worship Studies |
| IWS | Institute of Watershed Studies |
| IWS | Institute of Wilderness Studies |
| IWT | Institute for Writing and Thinking |
| IWT | Institute of Women Today |
| IYD | Institute for Youth and Development |
| IYF | Institute of Youth for Families |
| IYS | Institute for Youth Success |
| IZEB | Institute for Zero Energy Buildings |
| JAAI | Japan Auto Appraisal Institute |
| JAIC | Journal of the American Institute for Conservation |
| JAIIB | Junior Associate of Indian Institute of Bankers |
| JALI | Joint Administration & Logistics Institute |
| JATI | Judicial Administration Training Institute |