| Acronym | Definition |
|---|
| ISIR | Institute of Scientific and Industrial Research (Japan) |
| ISIR | Institut des Systèmes Intelligents et de Robotique (Paris, France) |
| ISIR | Institutional Student Information Report |
| ISIR | International Society for Intelligence Research |
| ISIR | Initial Sample Inspection Report |
| ISIR | International Society for Inventory Research (Budapest, Hungary) |
| ISIR | International Society for Impotence Research |
| ISIR | Integrated System of Information Resources |
| ISIR | In Service In Reserve |
| ISIR | Items of Special Interest Reporting |
| ISIR | Induction-Start Induction-Run (motors) |