| Abbreviation | Definition |
|---|---|
| IEC | International Egg Commission |
| IEC | International Electrotechnical Commission |
| IEC | International Electro-technical Commission |
| IEC | Internet Engineering Consortium |
| IEEE | Institute of Electrical and Electronics Engineers |
| IEFP | Instituto do Emprego e Formação Profissional |
| IEFP | International Exposition for Food Processors |
| IEI | Institution of Engineers (India) |
| IEK | Institution of Engineers of Kenya |
| IEMA | Institute of Environmental Management Assessment |
| IEMA | Iowa Emergency Management Association |
| IEOA | International Equestrian Organisers' Alliance |
| IEPA | Idl Expert Programmers Association |
| IEPA | International Environment Photographers Association |
| IEPC | Incentive Europe Premiums Concepts |
| IERI | Institut Européen des Relations Internationales |
| IESA | Illinois Electronic Security Association |
| IESG | Internet Engineering Steering Group |
| IESL | Institution of Engineers, Sri Lanka |
| IESNA | Illumination Engineering Society of North America |