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| ORRR | Oak Ridge Research Reactor | |
| ORRRC | Ohio River Road Runners Club | |
| ORRS | Outer Ring Road System | |
| ORRV | Off Road Recreational Vehicle | |
| ORS | Outside Release Switch | |
| ORS | Orpheus Island Resort, Queensland, Australia | |
| ORS | Octagonal Resources Limited | |
| ORS | Off Road System | |
| ORS | Off Road Series | |
| ORS | Off Road Solutions | |
| ORS | Off Road Suspension | |
| ORS | Off Road Shocks | |
| ORS | Occupant Restraint System | |
| ORS | Oakland Roadster Show | |
| ORS | Off Road Show | |
| ORS | Others | |
| ORS | Oral Rehydration Solution | |
| ORS | Occupant Restraint System | |
| ORS | Office of Regulatory Science | |
| ORS | Office of Regulatory Services | |
| ORS | Orlando Riva Sound | |
| ORS | Office Research Service | |
| ORs | Operating Rooms | |
| ORS | Object Relational Server | |
| ORS | Online Recovery Service |
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