| Abbreviation | Definition |
|---|---|
| GAA | Global Aids Alliance |
| GAAMA | Greater Atlanta Automotive Media Association |
| GABM | Global Association of Billionaires and Millionaires |
| GABR | Green Acres Boxer Rescue |
| GACL | German-American Citizens League |
| GACL | Greek-Australian Cultural League |
| GAEE | Global Association of Economics Education |
| GAIA | Global Alternative Information Applications |
| GAIN | Global Allergy Information Network |
| GAIN | Global Alliance for Improved Nutrition |
| GAIN | Grassroots Action Institute Network |
| GAM | Great American Meatout |
| GAN | Global Action Nepal |
| GANA | Global Anti-Nuclear Alliance |
| GAO | Global Action and Operation |
| GAP | Global Activity Project |
| GAP | Global Aid Partners |
| GAP | Guild Alliance Program |
| GAPP | Global Awareness Partnership Project |
| GAQ | Gujarati Association of Queensland |