| Abbreviation | Definition |
|---|---|
| GWTA | Gold Wing Touring Association |
| GWTA-WA | Gold Wing Touring Association - Washington State chapter |
| GWTM | Great West Texas Militia |
| GYM | Gymnastics |
| GYRO | Global Youth Rocketry Organization |
| HAMC | Hells Angels Motorcycle Club |
| HBOA | H-Body Owners Association |
| HCCT | Hand Cranked Coil Tester |
| HCGS | Harrison County Genealogical Society |
| HCGS | Highlands County Genealogical Society |
| HDC | Harley-Davidson Club |
| HDCI | Harley Davidson Club Indonesia |
| HEC | Healthy Eaters Club |
| HERD | Hobbies Exercise Relaxation and Diversion |
| HERD | Hobbies Exercise Rest and Diversion |
| HF | Hand Finished |
| HFMA | Have Fun, More Action |
| HFOC | Historic Formula One Championship |
| HGUC | High Grade Universal Century (Mobile Suit Gundam, models) |
| HLBA | Highland Lynx Breeders Association |