| OPR | Oakland Parks and Recreation 
| Others |
| OPR | Off Peak Return
| Others |
| OPR | Offensive Power Rating
| Others |
| OPR | Office of Parental Representation
| Others |
| OPR | Office of Planning and Research
| Others |
| OPR | Office of Population Research
| Others |
| OPR | Office of Primary Responsibilities
| Others |
| OPR | Office of Primary Responsibility
| Others |
| OPR | Office of Professional Regulation
| Others |
| OPR | Office of Professional Responsibilities
| Others |
| OPR | Office of Professional Responsibility
| Others |
| OPR | Office of Program Research
| Others |
| OPR | Office of Public Records
| Others |
| OPR | Office Password Recovery
| Others |
| OPR | Office Procedures Reinforcement
| Others |
| OPR | Officer Performance Report
| Others |
| OPR | Official Pattern Release
| Others |
| OPR | Official Poker Rankings
| Others |
| OPR | Official Public Record
| Others |
| OPR | Official Public Records
| Others |
| OPR | Offshore Passage Raft
| Others |
| OPR | Ohio Professional Registry
| Others |
| OPR | Old Parish Records
| Others |
| OPR | Old Parochial Registers
| Others |
| OPR | Old Port Rum
| Others |
| OPR | Old Post Road
| Others |
| OPR | On Page Rank
| Others |
| OPR | Online Prompt Recognition
| Others |
| OPR | Ontario Pacific Railway
| Others |
| OPR | Operating Performance Regime
| Others |
| OPR | Operating Performance Report
| Others |
| OPR | Operation Photo Rescue
| Others |
| OPR | Operation Portal Recon
| Others |
| OPR | Operational Peer Review
| Others |
| OPR | Operations Planning Review
| Others |
| OPR | Operator/Operate/Operation
| Others |
| OPR | Opioid Pain Reliever
| Others |
| OPR | Optimal Performance and Recovery
| Others |
| OPR | Oral Phonogram Review
| Others |
| OPR | Orbiter/Payload Recorder
| Others |
| OPR | Ordering Prescribing and Referring
| Others |
| OPR | Ordering Prescribing Referring
| Others |
| OPR | Oregon Pacific Railroad
| Others |
| OPR | Oregon Pacific Railroad Company
| Others |
| OPR | Oregon Primate Rescue
| Others |
| OPR | Organisation du Peuple Rodriguais
| Others |
| OPR | Organization of Primary Responsibility
| Others |
| OPR | Organizational Psychology Review
| Others |
| OPR | Original Product Resolution
| Others |
| OPR | Ottawa & Prescott Railway
| Others |
| OPR | Out of Period Revision
| Others |
| OPR | Out Pulse Rule
| Others |
| OPR | Outdoor Pursuits and Rentals
| Others |
| OPR | Outflow Performance Relationship
| Others |
| OPR | Over Pressure Relief
| Others |
| OPR | Overall Player Rating
| Others |
| OPR | Overall Pressure Ratio
| Others |
| OPR | Overflow Press Room
| Others |
| OPR | Overly Priced Rooms
| Others |
| OPR | Overnight Policy Rate
| Others |
| OPR | Owner Performance Requirements
| Others |
| OPR | Oxford Psychology Research
| Others |
| OPR | Oxygen Pressure Regulator
| Others |