| Abbreviation | Definition |
|---|---|
| ISRO | India Space Research Organization |
| ISRO | Indian Space and Research Organization |
| ISRO | Indian Space Research |
| ISRO | International Space Research Organisation |
| ISRO | International Strategic Research Organization |
| ISRO | Isroindian Space Research Organisation |
| ISRP | Integrated Systems Research Program |
| ISRP | Investigator Sponsored Research Program |
| ISRT | Institute of Statistical Research and Training |
| ISRU | In Situ Resource Utilisation |
| ISSG | In Situ Steam Generation |
| ISSRA | Institute for Strategic Studies Research Analysis |
| ISSRA | Institute for Strategic Studies Research and Analysis |
| ITNR | Information and Telecommunications Needs Research |
| ITQ | Irish Theological Quarterly |
| ITR | Institute for Translational Research |
| ITR | International Thermal Research |
| ITRA | International Toy Research Association |
| ITRC | Industrial Toxicology Research Centre |
| ITRC | Infrastructure Transitions Research |