HW can signify:
- Halloween
- Hardware (disambiguation)
- the Hartford Whalers, a former professional ice hockey franchise
- Harvard-Westlake, a private college-preparatory school in North Hollywood, California
- Heriot-Watt University, Edinburgh
- Homework, work for school
- Honeywell, a U.S. corporation
- Hotwire (disambiguation)
- Housewife
- Hutchison Whampoa, a company corporated in Hong Kong and China
- former U.S. President George H. W. Bush
- Hwair (ƕ), a Gothic letter
Read more about HW: In Entertainment, In Transportation