| Abbreviation | Definition |
|---|---|
| OMVIC | Ontario Motor Vehicle Industry Council |
| OOIDA | Owner-Operator Independent Drivers Association |
| OPSBA | Ontario Public School Boards' Association |
| OPSWA | Ontario Personal Support Workers Association |
| OPVA | Ontario Professional Videographers Association |
| ORCA | Ontario Retirement Communities Association |
| PASO | Pan American Sport Organization |
| PATF | Pennsylvania Assistive Technology Foundation |
| PCI | Precast Prestressed Concrete Institute |
| PCITS | Premium Customer IT Services |
| PESPA | Philippine Elementary School Principals Association |
| PESPA | Plumas-Eureka State Park Association |
| PETF | Pesticide Environmental Trust Fund |
| PFTA | Palestine Fair Trade Association |
| PG | Proficiency Gold |
| PIMA | Polyisocyanurate Insulation Manufacturers Association |
| PLCB | Pennsylvania Liquor Control Board |
| PMI | Plumbing Manufacturers International |
| PSAC | Petroleum Services Association of Canada |
| PSI | Pre-shipment Inspection (Technical) |