Other
- Household Hazardous Waste
- Heating Hot Water, terminology used in Construction and HVAC to label piping belong to a hydronic heating system, which heats a building using hot water instead of steam.
- HTML Help Workshop, an authoring system for HTML help files by Microsoft Corporation.
- hhw, a trigraph consonant used in written versions of the Dene Suline language (Eskimo)
- Hallstrom Homeschool Workshops (HHW or HHWS), a homeschooling network based in Illinois, USA
- Hip Hop Weekly (HHW), a US magazine which covers the hip-hop music scene
- Hollywood Heavyweight Wrestling, a US professional wrestling tournament
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