| Abbreviation | Definition |
|---|---|
| IEDF | Indian Engineering Design Forum |
| IEEP | Independent Energy Efficiency Program |
| IEEP | Inland Empire Economic Partnership |
| IEET | Institute for Ethics and Emerging Technologies |
| IEL | Institute for Educational Leadership |
| IELA | International Exhibition Logistics Association |
| IEMA | Interactive Entertainment Merchants Association |
| IEPR | Institute for European Policies and Reforms |
| IESF | Inland Empire Scholarship Fund |
| IESF | International Emergency Services Fund |
| IESH | Institut Europeen des Sciences Humaines |
| IESR | Institute for Essential Services Reform |
| IESS | Inner Enlightenment Spiritist Society |
| IETF | International Essential Tremor Foundation |
| IETF | Internet Engineering Task Force |
| IETG | Human Factors and Ergonomics Society Industrial Ergonomics Technical Group |
| IETH | Institute for Effective Therapy of Homosexuality |
| IETP | Indonesia and East Timor Project |
| IETS | International Embryo Transfer Society |
| IF | International Federation |