| Acronym | Definition |
|---|
| IISD➣International Institute for Sustainable Development |
| IISD➣Irving Independent School District (Irving, Texas) |
| IISD➣International Indian School, Dammam (India) |
| IISD➣International Institute for Sustained Dialogue (Washington, DC) |
| IISD➣Ingham Intermediate School District (Mason, MI) |
| IISD➣International Industrial Security Directorate (Canada) |