| Abbreviation | Definition |
|---|---|
| GSFCU | Garden Savings Federal Credit Union |
| GSFCU | Garden State Federal Credit Union |
| GSFCU | Goldwyn Studios Federal Credit Union |
| GTCU | Georgia Telco Credit Union |
| GTU | Guyana Teachers Union |
| GTUC | Guyana Trades Union Congress |
| GTWA | Greater Toronto Workers' Assembly |
| GUAS | General Union of Arab Students |
| GUCC | Greater Union County Chapter |
| GUCI | Goldman Union Camp Institute |
| GUD | Groupe Union Défense |
| GUD | Groupe Union Droit |
| GUF | Global Union Federation |
| GUF | Global Union Federations |
| GUHS | Grant Union High School |
| GUHSD | Glendale Union High School District |
| GUI | Golfing Union of Ireland |
| GUK | Golf Union Kyushu (Japan) |
| GUM | Gamers Union Malaysia |
| GUNT | Gouvernement d'Union Nationale de Transition |