| Acronym | Definition |
|---|
| PRR | Pennsylvania Railroad |
| PRR | Prairie (street suffix) |
| PRR | Pattern Recognition Receptor (immunology) |
| PRR | Production Readiness Review |
| PRR | Pulse Repetition Rate |
| PRR | Personal Role Radio |
| PRR | Pure Reason Revolution (band) |
| PRR | Pressure Regulator |
| PRR | Policy Research Report (Worldbank) |
| PRR | Pathogen Recognition Receptor (biology) |
| PRR | Peachtree Road Race (10K footrace; Atlanta, GA, USA) |
| PRR | Preliminary Requirements Review |
| PRR | Profiling Reflectance Radiometer (optical instrument measuring upwelling and downwelling light in a water column) |
| PRR | Pseudo Response Regulator (cell physiology) |
| PRR | Program Requirements Review |
| PRR | Preventive Resin Restoration (dentistry) |
| PRR | Packet Reception Ratio |
| PRR | Prison Release Reoffender |
| PRR | Problem Reporting and Resolution (quality management) |
| PRR | Priority Round Robin |
| PRR | Production Revision Record |
| PRR | Passenger Reservation Request |
| PRR | Primary Reference Receiver (Datum) |
| PRR | Pacific Road Runners (Canada) |
| PRR | Pressure Rise Rate |
| PRR | Packet Resource Request |
| PRR | Personnel Requirements Report |
| PRR | Problem Resolution Report |
| PRR | Program Readiness Review |
| PRR | Personnel Replacement Requirements |
| PRR | Parts Replacement Request |
| PRR | Property Rights Research |
| PRR | Personnel Readiness Review (US Army) |
| PRR | Production Revision Request |
| PRR | Pilot Record Request |
| PRR | Protective Response Recommendation |
| PRR | Personnel Resource Roster |
| PRR | Pyrochemical Reduction |
| PRR | Puerto Rico Supreme Court Reports |
| PRR | Product Review Report |
| PRR | Processing Rheology Ratio (thermoplastic olefinic compositions) |
| PRR | Predictive-Ratio Risk (software reliability) |
| PRR | Poker Room Review |
| PRR | Planned Reenlistment or Retirement |
| PRR | Peer Review Report (various organizations) |