OH
- OH – (s) Ohio (postal symbol)
- OHC – (i) OverHead-Cam engine
- OHHLA – (a) Original Hip-Hop Lyrics Archive
- OHIP – (a) Ontario Health Insurance Plan
- OHP – (i) Observatoire de Haute-Provence
- OHSS – (p) Ovarian Hyperstimulation Syndrome
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