| Acronym | Definition |
|---|
| OPCA | Organisme Paritaire Collecteur Agréé |
| OPCA | Organismes Paritaires Collecteurs Agrées (French: Observatory on Authorised Joint Collection Bodies) |
| OPCA | Ontario Private Campground Association (Canada) |
| OPCA | Oregon Pest Control Association |
| OPCA | Office of Public and Congressional Affairs (US FBI) |
| OPCA | Ohio Pest Control Association |
| OPCA | Oregon Primary Care Association |
| OPCA | Ontario Palliative Care Association |
| OPCA | Office of the Parliamentary Commissioner for Administration (UK) |
| OPCA | Oregon Police Canine Association |
| OPCA | Oklahoma Primary Care Association |
| OPCA | Oracle Portal Configuration Assistant |
| OPCA | Ontario Petroleum Contractors Association (Canada) |
| OPCA | Ohio Primary Care Association |
| OPCA | Ornamental Plant Collections Association (Australia) |
| OPCA | Ontario Painting Contractors Association (Canada) |
| OPCA | Overlay Policy Control Architecture |
| OPCA | Orange Park Christian Academy (Orange Park, FL) |
| OPCA | Office of Program Consultation and Accreditation (American Psychological Association) |
| OPCA | Oklahoma Pest Control Association (also seen as OK-PCA; trade group) |
| OPCA | Occupational Program Consultants Association |
| OPCA | Ocean Park Community Association |
| OPCA | Ontario Police Chaplains Association (Canada) |
| OPCA | Office Protestant des Communications Audiovisuelles (Switzerland) |
| OPCA | Olivopontine Cerebellar Atrophy |
| OPCA | Operative Candidate |
| OPCA | Ohio Precast Concrete Association |
| OPCA | Office of Public and Contract Archaeology |
| OPCA | Overseas Press Club of America |
| OPCA | Oil Pollution Control Act |
| OPCA | Oklahoma Paint and Coatings Association |