| Abbreviation | Definition |
|---|---|
| IESL | Intelligent Engineering Systems Laboratory |
| IESL | Intensive English as a Second Language Program |
| IESM | Institute of Engineering Science and Management |
| IESN | Institut d'Enseignement Superieur de Namur |
| IESP | Institute for Education and Social Policy - NYU Steinhardt |
| IESP | Institute for Environmental Science and Policy |
| IESS | Instituto Ecuatoriano de Securidad Social |
| IEST | Institute of Environmental Sciences and Technology |
| IET | Institute for Ecological Technology |
| IET | Institute of Engineering and Technology |
| IETA | International Experience and Technical Assistance |
| IETAP | International Experience and Technical Assistance Program |
| IETB | Institute of Education and Training for Business |
| IETC | Illawarra Employment and Teaching Centre |
| IETC | Institute Effective Teaching Committee |
| IETI | Industries Education Training Institute |
| IETI | International Electronics and Technical Institute |
| IETK | Institute of Engineering and Technology, Kanpur University |
| IETL | Institut d'Etudies du Travail de Lyon |
| IETL | Institute for Effective Teaching and Learning, Boise State University |