PBR
- PBR theorem
- PBRS
- Pabst Blue Ribbon
- Packed bed
- Parti Burkinabè pour la Refondation
- Partition boot record
- Passive bistatic radar
- Patrol Boat, River
- Patrol boat riverine
- Payment by Results
- Pebble-bed reactor
- Pelita Bandung Raya
- Performance-based regulation
- Periodic Bedrock Ridges
- Petrobras
- Phosphorus bromide
- Photobioreactor
- Physically based rendering
- Plant breeders' rights
- Plastic baton round
- Policy-based routing
- Pontypool and Blaenavon Railway
- Potters Bar railway station
- Pre-Budget Report
- Presidential budget request
- Professional Bull Riders
- Puffing Billy Railway