GHG
GHG may stand for:

 General Healthcare Group, a British healthcare company
 George H. Goble (also known as "ghg"), staff member at Purdue University
 Greenhouse gas, a gas that absorbs and emits radiant energy at thermal infrared wavelengths, causing the greenhouse effect
 Gruppenhorchgerät, a hydrophone array which was used on Nazi Germany's U-boats
 Marshfield Municipal Airport (Massachusetts) (FAA LID: GHG), a public airport located east of the central business district of Marshfield