| Acronym | Definition |
|---|
| OSSA | Oil Sands Safety Association (Canada) |
| OSSA | Office of Space Science and Applications (NASA) |
| OSSA | Ontario Service Safety Alliance (Toronto, Ontario, Canada) |
| OSSA | Oregon State Shooting Association |
| OSSA | Oklahoma State Skeet Association (National Skeet Shooting Association) |
| OSSA | Ontario Speed Skating Association |
| OSSA | Ostim Savunma Sanayii Kumelenmesi (Turkish defense industry cluster) |
| OSSA | Oregon School Safety Association |
| OSSA | Occupational Surveillance Scheme for Audiological Physicians |
| OSSA | Oxacillin-Sensitive Staphylococcus Aureus (bacteria) |
| OSSA | Operational Support System Architecture |
| OSSA | Official State Secrets Act (Great Britain) |
| OSSA | Ocean Surveillance Aircraft |
| OSSA | Open Secure Storage Area |