HHD

HHD may refer to:

Biology and medicine

• ATP2C1, a human enzyme
• Hailey–Hailey disease, a genetic disorder
• Hiatus hernia diafragmatica, a medical condition
• Home hemodialysis, for treating kidney failure

Other

• Astro Hua Hee Dai, a Malaysian television channel
• Hao Haidong (born 1970), Chinese footballer
• Headquarters and Headquarters Detachment in the United States Army
• Helena Historic District (disambiguation), various places in the United States
• High Holy Days (band), a Canadian rock band
• Hogshead (abbreviation: hhd), a barrel of liquid
• Holyhead railway station, in Wales
• Hybrid hard drive, a type of hard disk drive