| Abbreviation | Definition |
|---|---|
| HAR | Highway Advisory Radio |
| HARS | High Altitude Route System |
| HART | Highway Addressable Remote Transducer |
| HART | Highway Addressable Remote Transducer. |
| HART | Highway Addressable Remote Transmitter |
| HARV | High Alpha Research Vehicle |
| HAT | Handling and Assembly Technology |
| HAT | Height Above Touchdown |
| HAV | hybrid air vehicle |
| HAV | Hybrid Air Vehicles |
| HAVEN | Helping All Vessels Entering Now |
| HAZMAT | Hazardous Materials |
| HBL | House Bill of Lading |
| HBOL | Harbor Bill Of Lading |
| HBRR | Highway Bridge Replacement and Rehabilitation |
| HBRRP | Highway Bridge Replacement & Rehabilitation Program |
| HC | Hazardous Cargo |
| HC | Head Count |
| HC | High Cube (shipping container) |
| HC | Highway Cods |