ISRR
| Acronym | Definition |
|---|---|
| ISRR | International Soundex Reunion Registry |
| ISRR | International Symposium on Robotics Research |
| ISRR | Indiana Southern Railroad |
| ISRR | Internal System Requirements Review |
| ISRR | Intelligence, Surveillance, and Reconnaissance Requirement (military technology) |
| ISRR | Index of Search and Reunion Resources |