| Abbreviation | Definition |
|---|---|
| ISNAR | International Service for National Agricultural Research |
| ISNR | International Society for Neurofeedback and Research |
| ISNR | International Society for Neurofeedback Research |
| ISOAR | International Scholarly Open Access Research |
| ISOR | Indian Society of Oilseeds Research |
| ISPR | Integrated System of Participation in Research |
| ISPR | International Society for Paranormal Research |
| ISPR | International Society for Presence Research |
| ISPR | International Society of Photosynthesis Research |
| ISR | Industry Standard Research |
| ISR | Information Systems Research |
| ISR | Institute for Scripture Research |
| ISRA | Illinois Summer Research Academy |
| ISRA | Islamic Studies and Research Association |
| ISRB | Inter Services Research Bureau |
| ISRC | Interactive Systems Research Center |
| ISRE | International Society for Research on Emotion |
| ISRIP | International Sedimentation Research Institute Pakistan |
| ISRO | Iesindian Space Research Organization |
| ISRO | India Space Research Organisation |