| Abbreviation | Definition |
|---|---|
| ORGD | Organizations Directorate |
| ORH | Operation Restore Hope |
| ORL | Operations Research Laboratory |
| ORLA | Optimum Repair Level Analysis |
| ORM | Off-Route Mine |
| ORM | Operational Risk Management |
| ORM | Other Reportable Material |
| ORP | Objective Rally Point |
| ORP | Ocean Reception Point |
| ORP | Okret Rzeczypospolitey Polskiey |
| ORP | Operational Ration Packet |
| ORS | Obligated Reserve Service |
| ORS | Offense Reporting System |
| ORS | Operationally Responsive Space |
| ORSA | Operations Research and Systems Analysis |
| ORSA | Operations Research/Systems Analyst |
| ORSM | Off-Route Smart Mine |
| ORSMC | Off-Route Smart Mine Clearance |
| ORT | Overland Radar Technology |
| ORTA | Office of Research and Technology Applications |