| Abbreviation | Definition |
|---|---|
| GLTA | Gay and Lesbian Tennis Alliance |
| GLTB | Great Lakes Tournament Baseball |
| GLW | Great Lakes Wrestling |
| GLWA | Great Lakes Wrestling Alliance |
| GLWF | Great Lakes Wrestling Federation |
| GLWL | Great Lakes Warhammer league |
| GLWP | Gamma Live Wire Professional |
| GLWP | Great Lakes Water Polo |
| GLWX | Gamma Life Wire XP racquet |
| GM | Gambling Man |
| GM | Game Master |
| GM | Game Monitor |
| GM | Games Made |
| GM | Games Master |
| GMAB | Golf Management Association of Belgium |
| GMAC | Greater Miami Athletic Conference |
| GMC | Get More Championships |
| GMD | Gurupie Manager Draft |
| GMO | Greater Milwaukee Open |
| GMPS | Green Mountain Practical Shooters |