| Acronym | Definition |
|---|
| GSG | Grenzschutzgruppe (German: Border Protection Unit; anti-terrorist group) |
| GSG | German Sport Guns (Ense-Höingen, Germany) |
| GSG | Geschwister-Scholl-Gymnasium (Germany) |
| GSG | GetSomeGreek (St. Louis, MO) |
| GSG | Grand Strategy Game |
| GSG | Getting Started Guide (instructions) |
| GSG | Global Software Group |
| GSG | Global Scenario Group |
| GSG | Goldman Sachs Group, Inc. |
| GSG | Grant Street Group (Pittsburgh, PA) |
| GSG | Ground-Signal-Ground |
| GSG | Gunslinger Girl (anime) |
| GSG | Global Strategies Group |
| GSG | Geographic, Statistical and Government Information Centre (University of Ottawa; Canada) |
| GSG | Gujarat State Government (India) |
| GSG | Grampian Speleological Group (founded in 1961 in Scotland) |
| GSG | Great Science for Girls (initiative) |
| GSG | General Support Group |
| GSG | Geological Society of Glasgow (Scotland, UK) |
| GSG | Global Safety Group BV |
| GSG | Gross System Group |
| GSG | General Squadron Group |
| GSG | Grant Segment |
| GSG | Good Surgeon Guide (website) |