| Acronym | Definition |
|---|
| ISAR | Internet Standards Assessment Report (Web Marketing Association) |
| ISAR | Inverse Synthetic-Aperture Radar |
| ISAR | International Society for Astrological Research (Gainesville, FL) |
| ISAR | Input Segmentation and Reassembly |
| ISAR | International Standards of Accounting and Reporting |
| ISAR | International Symposium on Augmented Reality |
| ISAR | Institut des Sciences Agronomiques du Rwanda |
| ISAR | International Society for Antiviral Research |
| ISAR | International Society for Animal Rights |
| ISAR | Interferometric Synthetic Aperture Radar (INSAR) |
| ISAR | Inspection Services Activity Report (US FEMA) |
| ISAR | Introduction to Search and Rescue (course; National Association for Search and Rescue) |
| ISAR | Information System Activity Review |
| ISAR | Information Storage & Retrieval |
| ISAR | Integrated Safety Analysis Report |
| ISAR | Inverse Sidelooking Airborne Radar |
| ISAR | Information Systems and Research, Inc. (Fairfax, VA) |
| ISAR | Industry Safety Accident Rating |