| Acronym | Definition |
|---|
| GMG | Giornata Mondiale della Gioventù (Italian: World Youth Day) |
| GMG | Guardian Media Group |
| GMG | Global Migration Group (est. 2006) |
| GMG | Game Group PLC (stock symbol) |
| GMG | Global Manager Group |
| GMG | Gonzaba Medical Group (San Antonio, TX) |
| GMG | Golf Management Group (Netherlands) |
| GMG | Grenade Machine Gun |
| GMG | Global Marketing Group |
| GMG | Granada Media Group |
| GMG | Gloucestershire Media Group (UK) |
| GMG | Gesetz Zur Modernisierung des Gesundheitssystems (Germany: act to modernize the health system) |
| GMG | Gas Miners Guild (Freelancer game) |
| GMG | Green Media Group (Philippines) |
| GMG | Ground Mobile Gateway (US DoD) |
| GMG | Global Manufacturing Group (Queensland, Australia) |
| GMG | Georgia Marketing Group (Lawrenceville, GA) |
| GMG | Glasgow University Media Group |
| GMG | Gurnisht Mit Gurnisht (Yiddish: Nothing with Nothing) |
| GMG | (USN Rating) Gunner's Mate (Guns) |