| Abbreviation | Definition |
|---|---|
| GBAC | Greater Bangkok Athletics Conference |
| GCAA | Garden City Athletic Association |
| GCAA | Georgia Collegiate Athletic Association |
| GCAA | Greater Cabarrus Athletic Association |
| GCAA | Greater Cleveland Athletic Association |
| GCAC | Girls Catholic Athletic Conference |
| GCAC | Gulf Coast Athletic Conference |
| GEAA | General Electric Athletic Association |
| GFAA | Gloucester Fishermen Athletic Association |
| GLAA | Greater Lilburn Athletic Association |
| GLAC | Great Lakes Athletic Club |
| GMAC | Great Midwest Athletic Conference |
| GMAC | Greater Miami Athletic Conference |
| GNAA | Great Neck Athletic Association |
| GNAC | Great Northeast Athletic Conference |
| GNAC | Great Northwest Athletic Conference |
| GOAL | God Oriented Athletic League |
| GPAC | Great Plains Athletic Conference |
| GPAL | Geauga Police Athletic League |
| GRAA | Glen Ridge Athletic Association |