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