| Acronym | Definition |
|---|
| IISL➣International Institute of Space Law (est. 1960; University of Leiden; Leiden, Netherlands) |
| IISL➣International Institute for the Sociology of Law (Onati, Spain) |
| IISL➣India Index Services Limited (joint venture) |
| IISL➣India Industry Solutions Lab (IBM) |
| IISL➣Institut International sur le Droit de l'Espace (ESA) |