HHD

HHD may refer to:
 * Astro Hua Hee Dai, a Malaysian television channel
 * ATP2C1, a human enzyme
 * Hailey–Hailey disease, a genetic disorder
 * Headquarters and Headquarters Detachment in the United States Army
 * Helena Historic District (disambiguation), various places in the United States
 * Hiatus hernia diafragmatica, a medical condition
 * High Holy Days (band), a Canadian rock band
 * Hogshead (abbreviation: hhd), a barrel of liquid
 * Holyhead railway station, in Wales
 * Home hemodialysis, for treating kidney failure
 * Hybrid hard drive, a type of hard disk drive