| Abbreviation | Definition |
|---|---|
| GCC | Greenville Country Club |
| GCCA | Greater Chicago Cricket Association |
| GCCA | Gulf Coast Cycling Association |
| GCCG | Generic Collectable Card Game |
| GCCW | Genoa City Championship Wrestling |
| GCCW | Gulf Coast Championship Wrestling |
| GCD | Gait Cycle Data |
| GCFR | Galway-Cavendish Forest Rally |
| GCFR | Guatemala Charities Fund Raisers |
| GCI | Greatest Cricketer of India |
| GCK | Giants: Citizen Kabuto |
| GCLB | Gulf Coast League Braves |
| GCR | Glass City Rollers (Toledo, Ohio roller derby team) |
| GCSC | Gosford City Sports Council |
| GCSC | Gwinnett County Sports Commission |
| GCSN | Gem City Sports Network |
| GCW | Global Championship Wrestling |
| GCWA | Gulf Coast Wakeboard Association |
| GCWA | Gulf Coast Wrestling Alliance |
| GCZ | Grasshopper Club Zurich |