HAB may refer to:
- Habrough railway station, England; National Rail station code HAB
- A Habilitation, a post-doctoral research stage in Europe and Asia
- Home Affairs Bureau, Hong Kong
- High-altitude balloon
- Hokuriku Asahi Broadcasting, a television station in Ishikawa Prefecture, Japan]
- Hospitality Awarding Body
- Herzog August Bibliothek, a library in Wolfenbüttel, Germany.
- Marion County - Rankin Fite Airport (IATA: HAB), an airport serving Hamilton, Alabama, United States
- The HAB Theory, a 1976 science fiction novel by American author Allan W. Eckert