ORP
ORP is used to name a motorsport track in Oregon, various open‑source computing platforms, and scientific terms like oxidation‑reduction potential or optimum recording power.
Medical
Miscellaneous
Optional Retirement Program
Optimal Retirement Planner
Outdoor Recreation Program
Oyster Recovery Partnership
Optional Retirement Plan
Office of River Protection
Off Road Parking
Community
Governmental
Objective Rally Point
Operational Ration Packet
OFS (Orbiter Functional Simulator) Retransmission Processor
Ocean Reception Point
Okret Rzeczypospolitey Polskiey
Organisational Review Programme