| Acronym | Definition |
|---|
| IET | Institution of Engineering and Technology (merged name of IEE and IIE) |
| IET | International Economics and Trade |
| IET | Institute of Electronics and Telecommunications (Poznan University of Technology; Poland) |
| IET | Integrated Energy Therapy |
| IET | Institute of Educational Technology |
| IET | International Environmental Technology |
| IET | Initial Entry Training |
| IET | Intramolecular Electron Transfer |
| IET | Initial Engine Test |
| IET | International Equipment Trading (est. 1979; Vernon Hills, IL) |
| IET | Independent Evaluation Team |
| IET | International Emission Trading |
| IET | Interactive Educational Technology |
| IET | Interline E-Ticketing (airline carriers) |
| IET | Interline Electronic Ticketing (airlines) |
| IET | Image Enhancement Technology |
| IET | Institute of Environmental Technology (Houston, TX) |
| IET | Institute for Environmental Toxicology |
| IET | In-Port Emergency Team (US Navy) |
| IET | Industrial Engineering Technician |
| IET | Initiative for Environmental Technology |
| IET | Intelligent Electronic Typewriter |
| IET | Installation Evaluation Test |
| IET | Informatics, Educational Technology |
| IET | Intercultural Educational Technology |
| IET | Integral Effect Test (Korea Atomic Energy Research Institute) |
| IET | Information and Enterprise Technology |
| IET | Intelligence Exploitation Team (US DoD) |
