HGG

HGG may refer to:
 * Hackerspace Global Grid
 * Haggerston railway station, in London
 * Harlech Grits Group, a lithostratigraphic group in Wales
 * Heilig-Geist-Gymnasium, a Christian secondary school located in Broich in Würselen, Germany.
 * Henderson Group, a British investment management company
 * hhgregg, an American retailer
 * The Hitchhiker's Guide to the Galaxy, a comedy science fiction series created by Douglas Adams
 * Hyperbolic geometric graph
 * Home for the Golden Gays, a Filipino LGBT non-profit organization established in 1975