IISL
| 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) |