GSG

• German Sport Guns GmbH, a German firearms manufacturer

• Government Statistician Group, a community of government statisticians in the UK
• GSG 9, a German counter-terrorism and special operations unit

• Global Scenario Group, an environmental research organization
• Global Strategy Group, an American public affairs and research firm
• Grampian Speleological Group, a caving organisation, based in Scotland
• Great Southern Grammar, a school in rural Western Australia

• German Sign Language (ISO 639-3 language code)
• The Good Schools Guide, a British guide to schools
• Grand strategy game, a genre of board games and video games

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