GHG may stand for:
- The FAA location identifier for Marshfield Municipal Airport (Massachusetts) in Marshfield, Massachusetts
- General Healthcare Group, a UK private healthcare group
- George H. Goble, inventor of multi-CPU Unix systems, refrigerants, and winner of the 1996 Ig Nobel Prize in Chemistry.
- Gesenius' Hebrew Grammar, a grammar book of Hebrew, written by Wilhelm Gesenius
- Greenhouse gas, a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range
- Groothandelsgebouw, a building in the Netherlands
- Gruppenhorchgerät, a German sonar