OPR
- Church of Scotland
- Federal Highway Administration
- List of Statutory Instruments of the United Kingdom, 1989
- New-construction building commissioning
- O. Panneerselvam
- Office of Planning and Research
- Office of Population Research
- Office of Professional Responsibility
- Office of Professional Responsibility (IRS)
- Operator (disambiguation)
- Oregon Pacific Railroad (1880–94)
- Oregon Pacific Railroad (1997)
- Output Recordings
- Overall pressure ratio
- Overland Park Regional Medical Center
- Overnight Policy Rate
- P. Ravindhranath
- Rodrigues People's Organisation
- Trend Micro