PRR
- PRRS (disambiguation)
- Parietal reach region
- Pattern recognition receptor
- Pennsylvania Railroad
- Personal Role Radio
- Pichi Richi Railway
- Porsche Rennsport Reunion
- Princes Risborough railway station
- Production Rule Representation
- Proportional reporting ratio
- Pseudo-response regulator
- Pulse-repetition frequency
- Pure Reason Revolution
- Right-wing populism
- Rio-grandense Republican Party