| Abbreviation | Definition |
|---|---|
| GC | Green Canyon |
| GCAT | Georgia Coastal Aquatic Team |
| GCAT | Governmental Collectors Association of Texas |
| GCB | Grand Conseil de Bordeaux |
| GCB | Greater Cincinnati Behavioral Health Services |
| GCB | Minnesota Gambling Control Board |
| GCCB | Guthrie County Conservation Board |
| GCCR | Governor's Commission on Corrections Reform |
| GCCV | Georgia Agricultural Commodity Commission for Vegetables |
| GCCW | Gulf Coast Civil Works Project |
| GCDA | Georgia Career Development Association |
| GCDP | Galway County Development Plan (IE) |
| GCFR | Georgia's Child Fatality Review Program |
| GCI | Gibson County Illustrated |
| GCIF | Global Cities Indicator Facility |
| GCLB | Gallatin County Library Board |
| GCU | Guidance and Counseling Unit |
| GDA | Gwadar Development Authority |
| GDL | Graduated Driver Licensing |
| GDLP(s) | Graduated driver licensing program(s) |