| OHA | Oakland Housing Authority 
| Others |
| OHA | Office of Hawaiian Affairs
| Others |
| OHA | Office of Health Affairs
| Others |
| OHA | Office of Hearings and Appeals
| Others |
| OHA | Office of Historic Alexandria, VA
| Others |
| OHA | Office of the Healthcare Advocate
| Others |
| OHA | Ohakea, New Zealand
| Others |
| OHA | Ohio Hospital Association
| Others |
| OHA | Oklahoma Health Academy
| Others |
| OHA | Oklahoma Hospital Association
| Others |
| OHA | Old Hobartians Association football club
| Others |
| OHA | Omaha Housing Authority
| Others |
| OHA | One Handed Apps
| Others |
| OHA | Only Haunani Apoliona
| Others |
| OHA | Onondaga Historical Association
| Others |
| OHA | Ontario Hockey Association
| Others |
| OHA | Ontario Hospital Association
| Others |
| OHA | Open Handset Alliance
| Others |
| OHA | Operational Hazard Analysis
| Others |
| OHA | Oral Health America
| Others |
| OHA | Oral History Association
| Others |
| OHA | Oral Hypoglycemic Agent
| Others |
| OHA | Orange Hackers Association
| Others |
| OHA | Orbital Height Adjustment maneuver
| Others |
| OHA | Oregon Health Authority
| Others |
| OHA | Oregon Hunters Association
| Others |
| OHA | Orlando Housing Authority
| Others |
| OHA | Overseas Housing Allowance
| Others |
| OHA | Oxfordshire Health Archives
| Others |