| ORS | Oral Rehydration Solutions | |
| ORS | Open Resource System | |
| ORS | Organisation for Refugee Services | |
| ORS | Oregon Revised Statues | |
| ORS | Optical Response Sheet | |
| ORS | Office for Research Support | |
| ORS (CFSAN) | Office of Regulatory Science (CFSAN) | |
| ORSA | Occupational Road Safety Alliance | |
| ORSA | Occupational Road Safety Alliance | |
| ORSA | Officine Realizzazione Sarde Automobili | |
| ORSA | Off Road Severe Application | |
| ORSA | Orbit Reconstruction Simulation and Analysis | |
| ORSA | Operations Research/Systems Analyst | |
| ORSA | Operations Research and Systems Analysis | |
| ORSA | Operations Research Society of America | |
| ORSA | Operations Research Society of America | |
| ORSA | Outdoor Recreation Satellite Account | |
| ORSA | Office of Research Services and Administration | |
| ORSA | Operations Research Systems Analysis | |
| ORSA | Operations Research/Systems Analysis | |
| ORSA | Office of Research and Strategic Analysis | |
| ORSA | Operations Research System Analysis | |
| ORSA | Office of Research and Scholarly Activity | |
| ORSA | Ohio Recreational Sports Association | |
| ORSA | Oak Ridge Sportsmen's Association |
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