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| OH | Office Hours | |
| OH | One Handed | |
| OH | Ocular Health | |
| OH | Observation Helicopter | |
| OH | Observation Helicopter | |
| OH | Odd Harmonics | |
| OH | Odd Harmonics | |
| Oh My Yo | Inside Joke from our Grade 5/6 class | |
| OH NO | Obviously Hate; Never Otherwise | |
| OH YA | OverHill Young Americans | |
| OH&CC | Oberon Heritage and Collectors Club | |
| OH&S | Occupational Health & Safety | |
| OH2 | Water | |
| OH2 | hydroxide | |
| OH8 | Olduvai Hominid | |
| OH87 | Providence Hospital Heliport, Sandusky, Ohio USA | |
| OHA | Office of Hawaiian Affairs | |
| OHA | Oral Hypoglycemic Agent | |
| OHA | Ontario Hospital Association | |
| OHA | Oregon Hunters Association | |
| OHA | Ontario Hockey Association | |
| OHA | Office of Hearings and Appeals | |
| OHA | Ohio Hospital Association | |
| OHA | Overseas Housing Allowance | |
| OHA | Overseas Housing Allowance |
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