GG, Gg, or gg may mean:
- General Government, the name given by Germany to the governing authority in Poland after its occupation by the Wehrmacht in 1939
- Governor-General, the viceroy of many Commonwealth Realms
- Grundgesetz, the German constitution
- .gg, the Top-Level Domain country code for Guernsey
- GarageGames, an internet game publisher
- Gadu-Gadu, an instant messaging program popular in Poland
- Guilty Gear, a video game
- Sega Game Gear, a handheld gaming console
- General Grievous, a Star Wars character
- Gilmore Girls, a television comedy
- Golden Girls, a television sitcom
- Good Game, a television show for gamers
- Grand Game, a pricing game from The Price Is Right
- Grocery Game, another pricing game from The Price Is Right
- Gigagram, an SI unit of mass equal to 1,000,000 kilograms
- The IATA airline designator for Air Comores International
- An abbreviation for G.G. Allin
- Several meanings in Internet slang, most often "good game"