| Acronym | Definition |
|---|
| ORS | Oregon Revised Statutes |
| ORS | Office of Research Services |
| ORS | Office of Research Support (various schools) |
| ORS | Oral Rehydration Solution |
| ORS | Orthopaedic Research Society |
| ORS | Oral Rehydration Salts |
| ORS | Observatoire Régional de la Santé |
| ORS | Office of Retirement Services (Michigan) |
| ORS | Output Record Separator |
| ORS | Operationally Responsive Space (US DoD) |
| ORS | Open Retail System |
| ORS | Operation Related Services |
| ORS | Online Recovery Service |
| ORS | Object Relational Server |
| ORS | Oil Recovery System |
| ORS | Office of Regulatory Staff |
| ORS | Oneida Research Services (various locations) |
| ORS | Office of Research and Statistics (Social Security) |
| ORS | Octopole Reaction System (mass spectrometry) |
| ORS | Operation Resolute Support (NATO) |
| ORS | Online Reporting System |
| ORS | Operational Research Society |
| ORS | Onion River Sports (Montpelier, VT) |
| ORS | Oak Ridge Schools (Tennessee) |
| ORS | O-Ring Seal |
| ORS | Overseas Research Scholarships (postgraduate award; UK) |
| ORS | Order Routing System |
| ORS | Oculo-Respiratory Syndrome |
| ORS | Office for Recreation and Sport (Australia) |
| ORS | Ocean Rowing Society |
| ORS | Obligated Reserve Section |
| ORS | Operational Research Section |
| ORS | Occurrence Reporting System |
| ORS | Omnificent Role-playing System (gaming) |
| ORS | Office of Records Services (US government) |
| ORS | Offensive Radar System |
| ORS | Orbiter Refueling System (NASA) |
| ORS | Online Reference System |
| ORS | Online Recruiting Station |
| ORS | Optical Routing Switch (Corvis) |
| ORS | Occurrence Reporting Section |
| ORS | Operational Requirements Statement |
| ORS | Over Range Station |
| ORS | Orthopaedic Research Society ROC (Taiwan) |
| ORS | Open Replicator for Symmetrix (EMC) |
| ORS | On-Line Reprogramming System |
| ORS | OpRisk Suite |
| ORS | Office Repeater Shelf |
| ORS | Oregon Radiological Society |
| ORS | Open Registration System |