| Acronym | Definition |
|---|
| OPP | Opposite |
| OPP | Opportunity/Opportunities |
| OPP | Ontario Provincial Police (Ontario, Canada) |
| OPP | Office of Polar Programs (National Science Foundation) |
| OPP | Office of Pesticide Programs |
| OPP | Object Push Profile (Bluetooth) |
| OPP | Office of Pollution Prevention |
| OPP | Over Power Protection |
| opp | Opper (adjudant-onderofficier; Dutch) |
| OPP | Omega Psi Phi (Fraternity) |
| OPP | Office of Physical Plant (Pennsylvania State University) |
| OPP | Orleans Parish Prison (Louisiana) |
| OPP | Oriented Polypropylene Film |
| OPP | Organizational Process Performance (process area) |
| OPP | Outline Planning Permission |
| OPP | Ovine Progressive Pneumonia (Montana sheep pneumonia) |
| OPP | Other People's Property |
| OPP | Organophosphate Pesticide |
| OPP | Other People's Problems |
| OPP | Office of Policy and Planning |
| OPP | Operational Planning Process (Canada) |
| OPP | Organophosphate Poisoning |
| OPP | Osteopathic Principles and Practices |
| OPP | Opening Price Point |
| OPP | Order Processing Pipeline |
| OPP | Ore Processing Plant (mining extraction) |
| OPP | Original Prose and Poetry |
| OPP | Office of Program Performance (Legal Services Corporation) |
| OPP | Off-load Preparation Party |
| OPP | Opposed/Opposite |
| OPP | Orinda Park Pool (California) |
| OPP | Other People's Parts |
| OPP | Option to Purchase Paid-Up Additions (optional insurance rider used to increase life insurance benefit) |
| OPP | Off-Peak Power |
| OPP | Other People's Privates |
| OPP | Official Party Poopers :-) |
| OPP | FCC Office of Plans & Policy |
| OPP | Oregon Patriot Party |
| OPP | Octal Print Punch |
| OPP | Order Processing Point |
| OPP | Out of Print at Present |
| OPP | overprotective parent(s) |
| OPP | Organic Pear Production |
| OPP | Optional Program Product(s) |
| OPP | Ontario Paintball Place |
| OPP | Organizational Placement Process |
| OPP | Office of Patent Publication |
| OPP | Obligation Phasing Plan |
| OPP | Orthogonal Polynomial Predistortion |
| OPP | Organization and Personnel Plan |
| OPP | Operation Process Plan |
| OPP | Oral Proposal Planner |
| OPP | Optical Path Protection |
| OPP | Oxley Park Primary (school) |
| OPP | Outcome Project Plan (Canada) |
| OPP | Open Promenade Position (dance) |
| OPP | Off Plan Property (various locations) |
| OPP | Oxygen Partial Pressure |
| OPP | Out-of-Pocket Payment (insurance) |