ISAR
- Glas Isar
- ISARS
- Institute for the Study of Academic Racism
- Intelligible semi-automated reasoning
- Intergovernmental Working Group of Experts on International Standards of Accounting and Reporting
- International Search and Rescue Competition
- Inverse synthetic aperture radar
- Isar
- Isar Aerospace
- Isar Nuclear Power Plant
- Isar Rural District
- Isar, Marvinci
- Isar, Province of Burgos
- LSAR (disambiguation)