| Term | Full Form | Category |
|---|---|---|
| OASR | Obstetric anal sphincter rupture | Others |
| OASR | Office of Advocacy Student Representation | Others |
| OASR | Older Adult Self Report | Others |
| OASR | On A String Ranch | Others |
| OASR | On Any Sunday Riders | Others |
| OASR | Optical Automatic Speech Recognition | Others |
| OASR | Oregon Association of Shooting Ranges | Others |
| OASR | Outreach and School Relations | Others |
| OASR | Sabar, Afghanistan | Others |