| Acronym | Definition |
|---|
| IESS | Instituto Ecuatoriano de Seguridad Social (Ecuador) |
| IESS | International Embedded Systems Symposium |
| IESS | Integrated Electronic Systems Sector |
| IESS | International Encyclopedia of the Social Sciences |
| IESS | Imagery Exploitation Support System |
| IESS | Integrated Electronic Security System |
| IESS | Integrated Electronic Systems Sector (Motorola) |
| IESS | INTELSAT Earth Station Standards |
| IESS | Integrated Electromagnetic System Simulator |
| IESS | International Engineering Students Society (University of Melbourne) |
| IESS | Image Exploitation Support System |
| IESS | Inelastic Electron Scattering Spectroscopy |
| IESS | Initial Execution Sequence Set |