| IISL | India Index Services Ltd 
| Others |
| IISL | Indian Infotech and Software Ltd
| Others |
| IISL | Industria Italiana del Software Libero
| Others |
| IISL | Intelligent Infrastructure Systems Lab
| Others |
| IISL | Intelligent Infrastructure Systems Laboratory
| Others |
| IISL | International Institute for Space Law
| Others |
| IISL | International Institute for Spiritual Leadership
| Others |
| IISL | International Institute for the Sociology of Law
| Others |
| IISL | International Institute of Space Law
| Others |
| IISL | International Integrated Solutions Ltd
| Others |