| Abbreviation | Definition |
|---|---|
| ISDL | International Sustainable Development Law |
| ISDP | Integrated Swamp Development Project |
| ISDS | Individual Sewage Disposal System |
| ISEB | International Society for Environmental Biogeochemistry |
| ISEB | International Symposium on Environmental Biogeochemistry |
| ISEB | International Symposium on Environmental Biotechnology |
| ISEE | International Society for Environmental Epidemiology |
| ISEE | International Society for Environmental Ethics |
| ISEM | Integrated Safety and Environmental Management |
| ISEMS | Integrated Safety And Environmental Management System |
| ISEMS | Integrated Safety and Environmental Management Systems |
| ISEP | International Society for Environmental Protection |
| ISERD | International Society of Environmental and Rural Development |
| ISET | Institute for Social and Environmental Transition |
| ISFS | International Spent Fuel Storage |
| ISMP | Integrated Stormwater Management Plan |
| ISPM | International Standard for Phytosanitary Measure |
| ISPM | Invasive Species and Pest Management |
| ISPP | International Sewage Pollution Prevention |
| ISRIP | International Sedimentation Research Institute of Pakistan |