| Abbreviation | Definition |
|---|---|
| GAC | Great American Conference |
| GACS | General Assembly and Conference Services |
| GAIR | Global AI and Robotics Summit |
| GAM | Gathering of All Mariners |
| GAMC | Global Aspiring Medic Conference |
| GameRT | Games and Gaming Round Table |
| GAPC | Georgia Autism Providers Conference |
| GAPC | Global Alcohol Policy Conference |
| GARC | Grassroots Animal Rights Conference |
| GARC | Great America Rifle Conference |
| GARC | Great American Rifle Conference |
| GATAM | Gesellschaft Aerosolforschung Tagung ueber Aerosole naturwissenschaft Medizin (in German) Society aerosol research conference about aerosols natural science medicine |
| GATC | Governor and Administrator Training Conference |
| GATE | German Appropriate Technology Exchange |
| GBAC | Great Basin Anthropological Conference |
| GBAC | Greater Bangkok Athletics Conference |
| GBCD | Georgia Baptist Conference of the Deaf |
| GBHC | Greater Baltimore Hamboree and Computerfest |
| GBLC | Global Business Leaders Conference |
| GBPC | Global Best Practices Conference |