| Acronym | Definition |
|---|
| OHA➣Office of Hawaiian Affairs |
| OHA➣Office of Hearings and Appeals (US federal government) |
| OHA➣Ontario Hockey Association (Canada) |
| OHA➣Open Handset Alliance |
| OHA➣Ontario Hospital Association |
| OHA➣Ohio Hospital Association |
| OHA➣Otis Historical Archives (est. 1968; National Museum of Health and Medicine) |
| OHA➣Oral History Association |
| OHA➣Overseas Housing Allowance |
| OHA➣Oakland Housing Authority (Oakland, CA) |
| OHA➣Oral Health America |
| OHA➣Office of Health Affairs |
| OHA➣Omaha Housing Authority |
| OHA➣Office of Historic Alexandria (Alexandria, VA) |
| OHA➣Oncology Hematology Associates (Newburgh, IN) |
| OHA➣Orkney Housing Association (UK) |
| OHA➣Odorous House Ant (insect) |
| OHA➣Oakland Heritage Alliance (Oakland, CA) |
| OHA➣Orlando Housing Authority |
| OHA➣Ontario Horticultural Association (Canada) |
| OHA➣Oak Hill Academy |
| OHA➣Ontario Homeopathic Association (Canada) |
| OHA➣Oklahoma Heritage Association |
| OHA➣Oral Hypoglycaemic Agent |
| OHA➣Old Harveians' Association (UK; alumni group) |
| OHA➣Ontario Health Association (Canada) |
| OHA➣Outdoor Household Articles |
| OHA➣Occupational Health Assessment (NIOSH) |
| OHA➣Operations Hazard Analysis |
| OHA➣Ocala Housing Authority |
| OHA➣Octavia Hill Association, Inc. |
| OHA➣Organization for Humanitarian Assistance |
| OHA➣O'Hara Hall (University of Scranton) |
| OHA➣Operating/Operational Hazard Analysis |
| OHA➣Ohio Halfway House Association (now Ohio Community Corrections Association) |