HD

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

cience and technology

* Hard drive, a computer device which stores digitally encoded data, also known as HDD
* Henry Draper Catalogue, an astronomical catalogue often used to designate stars
* 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