Look up HD in
Wiktionary, the free dictionary.

HD may refer to:

Academia

• Handelshøjskolernes erhvervsøkonomiske Diplomuddannelse, a Danish evening course for a Graduate Diploma in Business and Administration
• Higher Diploma, an academic award

Business

• Harley-Davidson, an iconic American motorcycle manufacturer
• Headphone Dust, a record label run by music artist Steven Wilson
• Hokkaido International Airlines, a Japanese low-cost airline with IATA designator HD
• Home Depot, a chain of home improvement warehouse retailers

Medicine

• Attention-deficit hyperactivity disorder, known as Hyperactivity Disorder (HD), as in AD/HD
• Hip Dysplasia
• Hodgkin's disease
• Hormone disruptor
• Huntington's disease
• The HD gene, a historical name for the huntingtin gene, which can cause Huntington's disease when it has certain properties.

People

• Hilary Duff, an American singer and actress
• Hilda Doolittle, also known as H.D., an American poet

Places

• The HD postcode area, covering Huddersfield, Brighouse and Holmfirth in England, UK

Science and technology

• Hard drive, a computer device which stores digitally encoded data, also known as HDD
• Henry Draper Catalogue, a sequential numbering system for stars ordered by right ascension
• High-definition, in reference to high-definition video, high-definition television (HDTV), or Intel High Definition Audio
• High density, in reference to a floppy disk, other magnetic media or the optical formats HD DVD and Blu-ray
• Hybrid drive, a type of notebook computer hard drive that utilizes a large buffer
• Hydrogen deuteride, a diatomic compound of hydrogen and deuterium
• HD Radio, an abbreviation from the term Hybrid Digital/analog radio
• HD Photo, an image format
• the chemical warfare agent sulfur mustard, which in its distilled form is referred to as HD

Other

• Hit Dice, a statistic related to hit points, indicating role-playing game characters' health or durability
• Holocaust denial

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.