| Acronym | Definition |
|---|
| OH | Ohio (US postal abbreviation) |
| OH | Other Half (band) |
| OH | On Hand |
| OH | On Hold |
| OH | Oak Harbor (various locations) |
| OH | Off Hand (gaming) |
| OH | Finland (international aircraft code) |
| OH | Alcohol (functional group) |
| OH | Overhead |
| OH | Occupational Health |
| OH | Overhaul |
| OH | Overheard (Twitter) |
| OH | Hydroxide |
| OH | Overheat |
| OH | Outside Hitter (volleyball) |
| OH | Office Hour(s) |
| OH | Hydroxyl |
| OH | Hydroxyl Radical |
| OH | Out-of-House |
| OH | Off Hook |
| OH | Organ Harvesting |
| OH | Opposite Hand |
| OH | Ocular Hypertension |
| OH | Orleans House (Office Building in Liverpool, UK) |
| OH | Observation Helicopter |
| OH | Outer Housing |
| OH | Operating Hour |
| OH | Olfactory Hallucinations (psychiatric assessment) |
| OH | Osteopathic Hospitals (journal) |
| OH | Operational Handbook (USMC) |
| OH | Old Harrovian (alumni of Harrow School, UK) |
| OH | Operator Handled |
| OH | Orthostatic Hypertension |
| OH | Ottawa Hydro |
| OH | Oophorectomy and Hysterectomy |
| OH | Optimal Hyperplane |
| OH | Orthopedic Handicap |
| OH | Otaku Haven (anime) |
| OH | Organic Clays of Medium to High Plasticity (soil type) |
| OH | Object-To-Hex |
| OH | Orgiastic High |
| OH | Hospitallers Brothers of St. John of God (religious order) |