Abbreviations
- OH-, the prefix for aircraft registered in Finland
- OH, the state of Ohio
- OH, the IATA abbreviation for the airline Comair
- OH (chemistry), hydroxyl functional group
- OH− (chemistry), hydroxide
- •OH (chemistry), hydroxyl radical
- OH (chemistry), the functional alcohol group in a molecule, e.g. CH3CH2OH
- OH, in the Unified Soil Classification System, the designation for organic-rich clay or silt of high plasticity
- OH, a prefix of hominid fossils found at Olduvai Gorge, e.g. OH 13 ("Cindy")
- OH (military), the prefix for observation helicopter
- o.h. (architecture) overall height
- OH, text speak for "other half", i.e. partner or spouse
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