| Abbreviation | Definition |
|---|---|
| GWCI | Georgia Workshop on Culture and Institutions |
| GWFC | Great West Football Conference |
| GWS | Global Wellness Summit |
| GWS | Global Wireless Summit |
| GWTS | Great West Truck Show |
| GY | Game Year |
| GYC | General Youth Conference |
| GYSS | Global Young Scientist Summit |
| GYSS | Global Young Scientists Summit |
| HAAC | Heart of America Athletic Conference |
| HAC | Habbo Advice Centre |
| HACP | Hawaii Appellate Conference Program |
| HARPA | Helping AIDS in Resource Poor Areas |
| HASE | IEEE High-Assurance Systems Engineering Workshop |
| HBCE | Health Benefits Conference Expo |
| HBCE | Hispanic Business Conference Expo |
| HCAC | Heartland Collegiate Athletic Conference |
| HCCE | Historic Conference Centres of Europe |
| HCRP | Hawai'i Conference of Religions for Peace |
| HDC | Heartland Developer Conference |