| Abbreviation | Definition |
|---|---|
| ISSR | Institute For Social Science Research |
| ISSRA | Institute for Strategic Studies Research Analysis |
| ISSRA | Institute for Strategic Studies Research and Analysis |
| ISSRT | Institute for Safety Security Rescue Technology |
| ISSS | Institute of Social Science Survey |
| ISSSC | Institute for the Study of Secularism in Society and Culture |
| ISST | Institute for Security Science and Technology |
| ISST | Institute of Social Studies Trust |
| ISST | Institute of Sports Science Technology |
| IST | Institute of Spring Technology |
| ISTAR | Institute For Strategic Threat Analysis And Response |
| ISTB | Institute for Surgical Technology and Biomechanics |
| ISTCS | Institute for Socio Technical Complex Systems |
| ISTE | Instituteindian Society For Technical Education |
| ISTEM | Institute for Science Technology Engineering and Math |
| ISTEM | Institute for Science Technology Engineering and Mathematics |
| ISTEM | Institute for Science Technology Engineering Mathematics |
| ISTN | Institute for the Study of Traditional Naturopathy |
| ISTO | Institute for Strategy Technology and Organization |
| ISTS | Institute for Security Technology Studies |