| Acronym | Definition |
|---|
| OSAR➣Observatorio de Salud Reproductiva (Spanish: Reproductive Health Observatory; Guatemala) |
| OSAR➣Output Segmentation and Reassembly |
| OSAR➣Optical Storage And Retrieval |
| OSAR➣Odessa State Academy of Refrigeration (Ukraine) |
| OSAR➣Office Suisse d'Aide aux Refugies (French) |
| OSAR➣Ocean Search and Rescue |
| OSAR➣Operating Statement Analysis Report |
| OSAR➣Operational Safety Analysis Report |
| OSAR➣Operations Suitability Assessment Report |
| OSAR➣On Site Analysis Report (US Navy) |