| Acronym | Definition |
|---|
| IIEC➣International Institute for Energy Conservation |
| IIEC➣Inter-Institutional Equipment Committee (advisory body; Hong Kong) |
| IIEC➣Iran International Exhibitions Company |
| IIEC➣Islamic International Engineering College (Pakistan) |
| IIEC➣International Institute for Environmental Communication (Charlottesville, VA) |
| IIEC➣Isolated Intestinal Epithelial Cells (physiology) |