| Abbreviation | Definition |
|---|---|
| ISDI | Industrial Steel Drum Institute |
| ISDI | Institute for Sustainable Diversity and Inclusion |
| ISDI | International Self Defense Institute |
| ISDI | International Sustainable Development Institute |
| ISDL | Institute for Sustainable Development and Learning |
| ISDP | Institute for Security and Development Policy |
| ISDP | Institute for Security Development Policy |
| ISDR | Institute of Specialist Dispute Resolution |
| ISDSI | Indian Subcontinent Decision Sciences Institute |
| ISDSI | International Sustainable Development Studies Institute |
| ISE | Institute for Sustainable Enterprise |
| ISEA | Institute for Spatial Economic Analysis |
| ISEA | Institute of Special Education Advocacy |
| ISEAA | Institute of South East Asian Arts |
| ISEC | Institute for Social and Economic Change |
| ISEC | Institute of Science Education and Culture |
| ISEH | Institute of Sport Exercise and Health |
| ISEH | Institute of Sport Exercise Health |
| ISEL | Institute for the Study of European Laws |
| ISEM | Institute for Superconducting and Electronic |