| OHPA | Oak Hill Park Association
| Others |
| OHPA | Oak Hills Park Authority
| Others |
| OHPA | Occupational Health Physician Assistant
| Others |
| OHPA | Office of Health Practice Assessment
| Others |
| OHPA | Official Health Professions Advisor
| Others |
| OHPA | Ohio and Pennsylvania Railroad
| Others |
| OHPA | Ohio and Pennsylvania Railroad Company
| Others |
| OHPA | Ohio Horseshoe Pitchers Association
| Others |
| OHPA | Old Harding Pediatric Associates
| Others |
| OHPA | Olongapo Homing Pigeon Association
| Others |
| OHPA | Ontario Hay Producers Association
| Others |
| OHPA | Ontario Health Providers Alliance
| Others |
| OHPA | Oral Health Professionals Association
| Others |
| OHPA | Oregon Horseshoe Pitchers Association
| Others |