| Abbreviation | Definition |
|---|---|
| GWM | Grey Wolf Morgans |
| GWML | Great Western Main Line |
| GWP | George Washington Parkway |
| GWT | Gross Weight |
| GWTA | Goldsboro Wayne Transportation Authority |
| GYWR | Gross Vehicle Weight Rating |
| GZMTR | Guangzhou Mass Transit Rail |
| GZMTR | Guangzhou Metro |
| H | Hospital |
| H/H | Hotel to Home |
| HAA | Height Above Airport |
| HACS | Hazard Assessment Computer System |
| HACV | Heavy Armament Combat Vehicle |
| HAF | Horizon Air Freight |
| HAL | Height Above Landing |
| HAL | Holland America Line |
| HALO | High Angle Lift Off |
| HAM | Heavy Automotive Maintenance |
| HAPAS | Highway Authorities Product Approval Scheme |
| HAR | Harrisburg Amtrak Station |