| Acronym | Definition |
|---|
| ORSA➣Operations Research Society of America |
| ORSA➣Own Risk and Solvency Assessment |
| ORSA➣Occupational Road Safety Alliance (UK) |
| ORSA➣Options Regulatory Surveillance Authority |
| ORSA➣Outpatient Reduced-Cost Simplified Application (Los Angeles County, CA) |
| ORSA➣Oxacillin Resistant Staph Aureus |
| ORSA➣Operations Research & System Analysis |
| ORSA➣Augustinian Recollects (religious order) |