QH may refer to:
- Air Florida former IATA airline designator
- Kyrgyzstan (airline) current IATA airline designator
- American Quarter Horse, a breed of racing horses
- Qinghai, cf. CPG website
- Quinoline, a chemical compound
- Quaque hora, a medical abbreviation from the Latin phrase for "each hour" (used for prescribing)
- ATCvet code QH Systemic hormonal preparations, excluding sex hormones and insulins, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
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