MGH may refer to:
- Bad Mergentheim (vehicle registration plate), Germany
- Margate Airport (IATA code), South Africa
- Massachusetts General Hospital, Boston, US
- Charles/MGH station, near Massachusetts General Hospital
- Montreal General Hospital, Canada
- Michael Garron Hospital, Toronto, Canada
- Monumenta Germaniae Historica, a series of primary sources pertaining to German and European history
- Microglandular hyperplasia, a cervical lesion
- A formulation for calculating gravitational energy near the Earth's surface
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