| Abbreviation | Definition |
|---|---|
| GLYC | Gippsland Lakes Yacht Club |
| GLYC | Great Lakes Yacht Club |
| GLYC | Gull Lake Yacht Club |
| GMBC | Geelong Mountain Bike Club |
| GMBC | Glasgow Mountain Bike Club |
| GMBC | Green Mountain Bicycle Club |
| GMBC | Greenhills Montmorency Baseball Club |
| GMC | Good Mood Club |
| GMFC | Gloucester Model Flying Club |
| GMFC | Grampian Microlight Flying Club |
| GMFC | Greenock Morton Football Club |
| GMSC | Gold Medal Swim Club |
| GMSC | Grande Maumelle Sailing Club |
| GMSC | Greater Miami Ski Club |
| GMSC | Greenwood Memorial Swim Club |
| GNAC | Good Neighbor Adventure Club |
| GNBC | Great Northern Brewers Club |
| GNBC | Greater Niagara Boating Club |
| GNCC | Grand National Curling Club |
| GNHC | Guru Nanak Hockey Club |