GHG can be an abbreviation for:
- Greenhouse gas
- George H. Goble, inventor of multi-CPU Unix systems, refrigerants, and winner of the 1996 Ig Nobel Prize in Chemistry.
- Marshfield Municipal Airport (Massachusetts) in Marshfield, Massachusetts.
- Gesenius' Hebrew Grammar - A grammar book of Hebrew, written by Wilhelm Gesenius.
- General Healthcare Group - UK private healthcare group