OPR
The abbreviation OPR stands for:
- the Old Catholic Order of Port Royal
- Opera Romana Pellegrinaggi , the Vatican Pilgrims Office, see Roman Pilgrimage
- Optimized Power Reactor , a type of South Korean nuclear reactor
OPR as a distinguishing mark on license plates:
- Germany: Ostprignitz-Ruppin district
- Poland: Powiat Prudnicki in the Opole Voivodeship
