| Abbreviation | Definition |
|---|---|
| GNSC | Geraldton Nordic Ski Club |
| GNSC | Girdwood Nordic Ski Club |
| GNSC | Gold Nugget Soccer Club |
| GNSC | Gravesend and Northfleet Swimming Club |
| GNSC | Great Neck Soccer Club |
| GNSC | Greater Napanee Soccer Club |
| GOC | Gay Outdoor Club |
| GOCC | Great Ohio Coaster Club |
| GPAC | Greater Pensacola Aquatic Club |
| GPAC | Greater Philadelphia Aquatic Club |
| GPCA | German Pinscher Club of America |
| GPCA | Great Pyrenees Club of America |
| GPCC | Great Pyrenees Club Of California |
| GPCC | Grosse Pointe Camera Club |
| GPDC | Greater Portland Dachshund Club |
| GPFC | Golden Point Football Club |
| GPFC | Grand Popo Football Club |
| GPGC | Grand Prairie Gun Club |
| GPHC | Grace Park Hawthorn Club |
| GPTC | Greater Philadelphia Track Club |