| Abbreviation | Definition |
|---|---|
| HSAM | Heathrow Surface Access Model |
| HSCT | High Speed Commercial Transport |
| HSFV | High Speed Freight Vehicle |
| HSGT | high speed ground transportation |
| HSGT | High-Speed Ground Transportation |
| HSI | Horizontal Situation Indicators |
| HSIS | Highway Safety Information System |
| HSL | High Speed Line |
| HSM | Hyper Sonic Motor |
| HSMT | Homer Spit Marine Terminal |
| HSR | High Speed Rail |
| HSR/MLA | High Speed Rail/Maglev Association |
| HSS | High-speed Sea Service |
| HSSGT | High-Speed Guided Ground Transportation |
| HST | High Speed Train |
| HSTC | Human Services Transportation Coordination |
| HSTD | Human Service Transportation Delivery |
| HSTP | Human Service Transportation Plan |
| HSTP | Human Services Transportation Plan |
| HSTS | Halton Student Transportation Services |