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HGG may refer to:

  • Hackerspace Global Grid
  • Haggerston railway station, in London
  • Harlech Grits Group, a lithostratigraphic group
  • 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