| IESP | Incentive Engagement Solution Providers 
| Others |
| IESP | Incentive Engagement Solutions Providers
| Others |
| IESP | Indigenous Enriched Support Program
| Others |
| IESP | Institute for Earth System Preservation
| Others |
| IESP | Institute for Education and Social Policy
| Others |
| IESP | Institute for Education and Social Policy - NYU Steinhardt
| Others |
| IESP | Institute for Environmental Science and Policy
| Others |
| IESP | Institute for Excellence in Services and Planning
| Others |
| IESP | Integrated Enterprise Services Platform
| Others |
| IESP | Inter Enterprise Service Provider
| Others |
| IESP | International Endocrine Scholars Programme
| Others |
| IESP | International Etruscan Sigla Project
| Others |
| IESP | Internet Education Support Program
| Others |