| Abbreviation | Definition |
|---|---|
| GBA | Green Building Alliance |
| GBCA | Greater Baltimore Cultural Alliance |
| GBWA | Golovin Bay Watershed Alliance |
| GCA | Global Combat Alliance |
| GCA | Global Cyber Alliance |
| GCAA | Gulf Coast Artists' Alliance |
| GCBA | Genesee County Bridal Alliance |
| GCCA | Global Community Communications Alliance |
| GCCA | Global Cool Cities Alliance |
| GCDA | Gulf Coast Dance Alliance |
| GCEA | Galveston County Economic Alliance |
| GCHA | Global Climate and Health Alliance |
| GCMA | Global Coaching Mentoring Alliance |
| GCRA | Global Coral Reef Alliance |
| GDA | Global Distribution Alliance |
| GDA | Global DMC Alliance |
| GDA | Green Dining Alliance |
| GDLA | Global Dry Land Alliance |
| GEA | Gigabit Ethernet Alliance |
| GEA | Greater Edmonton Alliance |