| Abbreviation | Definition |
|---|---|
| IEN | Industrial Engineering News |
| IEN | Internal Engineering Notice |
| IENC | Inland Electronic Navigational Charts |
| IEO | Indian Engineering Olympiad |
| IEOB | Infrastructure Engineering and Operations Branch |
| IEOR | Industrial Engineering Operations Research |
| IEP | Installation Engineering Plan |
| IEPC | International Engineering Procurement and Construction |
| IERG | Industrial Engineering Research Group |
| IERI | Information Engineering Research Institute |
| IERT | Institute of Engineering and rural technology |
| IES | Illumination Engineering Society |
| IES | Indian Engineering services |
| IES | Innovative Engineering Systems |
| IESL | Innovative Engineering Systems Limited |
| IESM | Industrial Engineering and Systems Management |
| IESM | Institute Of Engineering Science Management |
| IESM | international ENGINEERING SAFETY MANAGEMENT |
| IESNA | Illuminating Engineering Society of North America1 |
| IESS | International Engineering Sourcing Show |