| Rank | Abbreviation | Meaning |
|---|
| ***** | OPCA | Ontario Painting Contractors Association
| |
| ***** | OPCA | Office of Public and Congressional Affairs
| |
| ***** | OPCA | Ohio Pest Control Association
| |
| **** | OPCA | olive-ponto-cerebellar atrophy
| |
| **** | OPCA | Oklahoma Paint and Coatings Association
| |
| **** | OPCA | Oracle Portal Configuration Assistant
| |
| **** | OPCA | Olivopontine Cerebellar Atrophy
| |
| **** | OPCA | Oklahoma Pest Control Association
| |
| **** | OPCA | Office of the Parliamentary Commissioner for Administration
| |
| **** | OPCA | Office of Public and Consumer Affairs
| |
| **** | OPCA | Operative Candidate
| |
| **** | OPCA | Olivo Ponto Cerebellar Atrophy
| |
| **** | OPCA | Occupational Program Consultants Association
| |
| **** | OPCA | Ohio Primary Care Association
| |
| **** | OPCA | Oriented Principal Component Analysis
| |
| **** | OPCA | Oklahoma Primary Care Association
| |
| **** | OPCA | Otter Point Creek Alliance
| |
| **** | OPCA | Office Protestant des Communications Audiovisuelles
| |
| **** | OPCA | Oregon Pest Control Association
| |
| **** | OPCA | Organisme Paritaire Collecteur Agréé
| |
| **** | OPCA | Olivopontocerebellar Atrophy
| |
| **** | OPCA | Overlay Policy Control Architecture
| |
| *** | OPCA | Orange Park Christian Academy
| |
| *** | OPCA | Ohio Precast Concrete Association
| |
| *** | OPCA | Oregon Police Canine Association
| |