HD

HD may refer to:

Business

 * H-D or Harley-Davidson, a motorcycle manufacturer
 * The Home Depot, NYSE stock symbol: HD

Chemistry

 * Hydrogen deuteride, a diatomic compound of hydrogen and deuterium
 * Mustard gas

Codes

 * Air Do, formerly Hokkaido International Airlines, IATA designator
 * HD postcode area, covering Huddersfield, Brighouse and Holmfirth in England, UK
 * Heidelberg's vehicle registration plate code
 * Hunedoara County (Romania)'s ISO 3166 code

Medicine

 * Hansen's disease or leprosy
 * Hirschsprung's disease, a disorder of the abdomen
 * Huntington's disease, a genetic disorder affecting the central nervous system
 * HD (gene) or huntingtin, the IT15 gene, which codes for the huntingtin protein

People

 * H.D. or Hilda Doolittle (1886–1961), American poet and novelist
 * HD (commentator) or HDStarcraft, former e-sports commentator

Other uses

 * Helsingborgs Dagblad, a Swedish newspaper
 * Henry Draper Catalogue, an astronomical catalogue often used to designate stars
 * Department of Highways (disambiguation)
 * Högsta Domstolen, the Supreme Court of Sweden
 * Hurter and Driffield Numbers or H&D, an old scale for measuring film speed

Technology

 * Hard drive, an electro-mechanical data storage device
 * Hash digest, the output of a hash function
 * HD Photo, an image format
 * HD Radio, an abbreviation from the term hybrid digital/analog radio
 * HD Voice, or wideband audio
 * Heavy Duty (disambiguation)
 * High density, a diskette density
 * High-definition television (HDTV), a resolution that is substantially higher than that of standard-definition television
 * 720p (HD), a progressive HDTV signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9
 * High-definition video, video of higher resolution and quality than standard-definition
 * Intel High Definition Audio, a specification for the audio sub-system of personal computers