HHD
HHD may refer to:
- Astro Hua Hee Dai, a Malaysian television channel
- ATP2C1, a human enzyme
- Headquarters and Headquarters Detachment in the United States Army
- Helena Historic District (Helena, Montana)
- High Holy Days (band), a Canadian rock band
- Holyhead railway station, in Wales
- Home hemodialysis, a life-supporting treatment for people with kidney failure
- Hybrid drive, a type hard disk drive
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