| Abbreviation | Definition |
|---|---|
| GISS | Global Issues Service Summit |
| GISS | Global It Security Summit |
| GITEX | Gulf Information Technology Exhibition |
| GLAC | Germanic Linguistics Annual Conference |
| GLAC | Great Lakes Astrology Conference |
| GLBTRT | Gay Lesbian and Transgender Round Table |
| GLC | Global Leadership Conference |
| GLC | Greek Leadership Conference |
| GLC | Greenhand Leadership Conference |
| GLCC | Green Lake Conference Center |
| GLEC | Great Lakes EYEcare Conference |
| GLFC | Great Lakes Football Conference |
| GLFF | Great Lakes Folk Festival |
| GLMC | Global Leadership Ministries Conference |
| GLMC | Great Lakes Meteorology Conference |
| GLOBE | Gay and Lesbian Organization and Business Exposition |
| GLOBECOM | IEEE Global Communications Conference |
| GLOBECOM | IEEE GLOBal TeleCOMmunications Conference |
| GLOC | Great Lakes Oracle Conference |
| GLS | Global Learning Summit |