Outpatient Prospective Payment System
ICAO code for Peshawar Airport, Peshawar, Pakistan
Octaprenyl pyrophosphate synthase
Office of Personnel, Policy and Standards
Office of the Purveyor of Public Supplies
Operational Product Processing System
Operations Planning and Project Support
organophosphorus pesticides
Outpatient Prospective Payment Systems
Oxley Park Public School
Observatoire Paritaire du Portage Salarial
Odrodzona Polska Partia Socjalistyczna
Olympic Peninsula Paranormal Society