| Acronym | Definition |
|---|
| IES | Illuminating Engineering Society |
| IES | Institute of Education Sciences (US Department of Education) |
| IES | Illuminating Engineering Society (of North America) |
| IES | Institute for European Studies |
| IES | Institute for Environment and Sustainability |
| IES | Industrial Extension Service (North Carolina State University) |
| IES | Institute for Employment Studies |
| IES | Impact of Event Scale |
| IES | Institute for Environmental Studies (University of Wisconsin-Madison) |
| IES | Intergroup Exemestane Study |
| IES | Institute of Environmental Sciences |
| IES | Integrated Energy Systems (Department of Energy) |
| IES | IEEE Industrial Electronics Society |
| IES | Information Exchange System |
| IES | Indian Engineering Services |
| IES | Inverted Echo Sounders |
| IES | Institute for Environmental Security (The Hague, Netherlands) |
| IES | Indian Environmental Society (India) |
| IES | Iowa Engineering Society |
| IES | Intelligent and Evolutionary Systems |
| IES | Imaging Electron Spectrometer |
| IES | Imagery Exploitation Services |
| IES | Intelligent Emulation Switching (Epson) |
| IES | Indrema Entertainment System |
| IES | Imagery Exploitation Support |
| IES | Institutions de l'Enseignement Supérieur |
| IES | Institute of Engineering Science |
| IES | Industrial Engineering Standard |
| IES | iPlanet Enterprise Server |
| IES | Interfaith Emergency Services |
| IES | Iaeger Elementary School (West Virginia) |
| IES | IDEX II Imagery Exploitation Station |
| IES | Interferometric Editing System |
| IES | Imagery Exploitation Segment |
| IES | Imagery Exploitation/Exploration System |
| IES | Institute of Ecosytem Studies |
| IES | Industrial Engineer Standard |
| IES | Intelligence Exploitation Squadron |
| IES | Imelda Elementary School (Philippines) |
| IES | International Energy Services (various locations) |
| IES | Institute of Economics and Statistics (University of Oxford; UK) |
| IES | Innovative Energy Services, Inc. (various locations) |
| IES | Incomplete or Erroneous Specification (software quality) |
| IES | International Exchange Service (various organizations) |