| Abbreviation | Definition |
|---|---|
| GBPN | Global Building Performance Network |
| GBSF | Guillain- Barré Syndrome Foundation |
| GBSFI | Guillain- Barré Syndrome Foundation International |
| GC | General Committee |
| GC | Gilda's Club |
| GCAGS | Gulf Coast Association of Geological Societies |
| GCBS | German-Canadian Benevolent Society |
| GCC | Germantown Community Connection |
| GCCA | Global Campaign for Climate Action |
| GCCA | Global Cold Chain Alliance |
| GCCA | Greater Chinatown Community Association |
| GCCA | Guyana Canada Cultural Association (Calgary) |
| GCCB | Gulf Coast Consortium for Bioinformatics |
| GCCE | Global Center for Cultural Entrepreneurship |
| GCCE | Greater Chapin Community Endowment |
| GCCF | Global Center for Children and Families |
| GCCF | Governing Council of the Cat Fancy |
| GCCF | Grand Canyon Conservation Fund |
| GCCF | Gulf Coast Community Foundation |
| GCCH | Greater Cincinnati Coalition for the Homeless |