| Acronym | Definition |
|---|
| ORP | Oxidation-Reduction Potential |
| ORP | Offender Reentry Program |
| ORP | Original Research Proposal (graduate studies) |
| ORP | Original Retail Price |
| ORP | Optional Retirement Program |
| ORP | Off Road Pipe |
| ORP | Open Router Project |
| ORP | Office of River Protection |
| ORP | Office of Research and Publications (various schools) |
| ORP | Off Road Parking (housing, UK) |
| ORP | Objective Rally Point (Army) |
| ORP | Organisational-Review Programme (Ireland) |
| ORP | Office of Radiation Protection |
| ORP | Oakdale Research Park (Univerity of Iowa) |
| ORP | Oral Rehydration Point (health resource) |
| ORP | Origo Resource Partners (UK) |
| ORP | Open Runtime Platform |
| ORP | Office of Radiation Programs (US EPA) |
| ORP | Operational Recovery Plan |
| ORP | Ocean Reception Point (US DoD) |
| ORP | Operational Readiness Platform |
| ORP | Operational Ration Pack |
| ORP | Operational Research Project (India) |
| ORP | Overall Responsible Party (public HIV surveillance official) |
| ORP | Okret Rzeczypospolitej Polskiej (Polish: Ship of the Polish Republic; Poland) |
| ORP | Occurrence Reporting Program |
| ORP | Originating Responsibility Plan |
| ORP | Oil Recovery Plant |
| ORP | Organizational Performance Review |
| ORP | Oficina de Responsabilidad Pública (Spanish, Guatemalan Internal Affairs office) |
| ORP | Operation Readiness Plan |
| ORP | Operational Requirements Panel |
| ORP | Optical Recorder Peripheral |
| ORP | Operative Radiated Power |
| ORP | Ordinary Renewal Process |
| ORP | Order Review Point |
| ORP | Optical Reference Plane |