| IESL | Indian Ex Services League 
| Others |
| IESL | Information Extraction and Synthesis Laboratory
| Others |
| IESL | Innovative Engineering Systems Limited
| Others |
| IESL | Innovative ERP Solutions Ltd
| Others |
| IESL | Institute for the Empirical Study of Language
| Others |
| IESL | Institute of Electronic Structure and Laser
| Others |
| IESL | Institution of Engineers Sri Lanka
| Others |
| IESL | Institution of Engineers, Sri Lanka
| Others |
| IESL | Intelligent Energy Saving Lighting
| Others |
| IESL | Intelligent Engineering Systems Laboratory
| Others |
| IESL | Intensive English as a Second Language
| Others |
| IESL | Intensive English as a Second Language Program
| Others |
| IESL | International Energy Services Limited
| Others |
| IESL | Internationella Engelska Skolan Linkoping
| Others |