| OPEP | Occupational Post Exposure Prophylaxis 
| Others |
| OPEP | Office of Policy Evaluation and Planning
| Others |
| OPEP | Office of Policy Evaluation Planning
| Others |
| OPEP | Office of Program Evaluation and Performance
| Others |
| OPEP | Oil Pollution Emergency Plans
| Others |
| OPEP | One Pion Exchange Potential
| Others |
| OPEP | Ontario Pesticide Education Program
| Others |
| OPEP | Operations Production Enterprises and Project
| Others |
| OPEP | Optometric Practice Enhancement Program
| Others |
| OPEP | Organization of Parent Education Programs
| Others |
| OPEP | Organization of Parenting Education Programs
| Others |
| OPEP | Oscillating Positive Expiratory Pressure
| Others |
| OPEP | Oscillatory Positive Expiratory Pressure
| Others |
| OPEP | Osteoporosis Prevention Exercise Protocol
| Others |
| OPEP | Ottawa Psychiatry Enrichment Program
| Others |