| Abbreviation | Definition |
|---|---|
| GRUFC | Glossop Rugby Union Football Club |
| GRUFC | Guernsey Rugby Union Football Club |
| GSC | Germantown Soccer Club |
| GSC | Gerudo Secret Club |
| GSC | Glacier Swim Club |
| GSCA | Giant Schnauzer Club of America |
| GSCA | Gordon Setter Club of America |
| GSCC | Glendora Seniors Computer Club |
| GSCO | Grand Slam Club Ovis |
| GSFC | Golden State Flying Club |
| GSFC | Gouenji Shuuya Fan Club |
| GSIC | Golden State Insulator Club |
| GSSC | Grapevine Southlake Soccer Club |
| GSSC | Gregory Seahurst Swim Club |
| GSTC | Garden State Track Club |
| GTBC | Green Templeton Boat Club |
| GTC | Global Trading Club |
| GTTC | Gymnastics Tape Trading Club |
| GUBC | Glasgow University Boat Club |
| GUCC | Glasgow University Canoe Club |