| Abbreviation | Definition |
|---|---|
| OHA | Oregon Health Authority |
| OHA | Orlando Housing Authority |
| OHC | Oregon Health Council |
| OHC | Oregon Housing and Community Services Department |
| OHCAP | Ontario Hepatitis C Assistance Plan |
| OHD | Occupational Health Department |
| OHDS | Occupational Health Delivery System |
| OHE | Office of Higher Education |
| OHF | Ontario Heritage Foundation |
| OHG | Oregon Heritage Grant |
| OHIP | Ontario Health Insurance Plan |
| OHMS | Oregon Health Management Services |
| OHO | Oregon Health Office |
| OHP | Ohio Highway Patrol |
| OHP | Ontario Health Premium |
| OHPA | Oak Hills Park Authority |
| OHPA | Office of Health Practice Assessment |
| OHR | Ozark Heritage Region |
| OHRC | Ontario Human Rights Commission |
| OHS | Oregon Health Services |