| Acronym | Definition |
|---|
| IEI | ICP Electronics, Inc. (Taiwan) |
| IEI | Interrupt Enable Input |
| IEI | International Energy Insurance |
| IEI | Internacia Esperanto-Instituto (Esperanto: International Esperanto Institute) |
| IEI | Institution of Engineers India |
| IEI | Institution of Engineers of Ireland |
| IEI | International Electronics Inc |
| IEI | Ion Exchange India |
| IEI | Iwashita Engineering, Inc. (Japan) |
| IEI | International Epidemiology Institute |
| IEI | Internal Electrical Installation |
| IEI | Israel Export Institute |
| IEI | Information Element Identifier (data marker) |
| IEI | Imasen Electric Industrial (Japan) |
| IEI | International Education Initiative (World Affairs Council) |
| IEI | Indoor Environmental Institute |
| IEI | Interrupt Enable Input (microprocessors) |
| IEI | International Environmental Institute |
| IEI | Invitation for Expression of Interest |