DH

DH, Dh, dh, or dH may refer to:

Places

 * DH postcode area, in the United Kingdom for the area of Durham and surrounding towns
 * Diamond Head, Hawaii, a volcanic tuff cone on Oʻahu
 * Dadra and Nagar Haveli and Daman and Diu, a union territory of India (ISO 3166-2)

Organisations

 * D+H, a Canadian financial services company
 * Department of Health (United Kingdom), a department of the UK government
 * DH Press, the Dark Horse Comics imprint that publishes novels
 * Deccan Herald, an Indian newspaper

Science and technology

 * Denavit–Hartenberg parameters, a type of robotics convention
 * Dermatitis herpetiformis, a skin disease
 * DH register, the high byte of a DX register in x86-compatible microprocessors
 * Diffie-Hellman key exchange (D-H), a specific method of securely exchanging cryptographic keys over a public channel
 * District heating, a method of heating multiple buildings from a central location
 * Doubled haploidy, a genetic status
 * Deuterium:protium (D:H), a ratio in deuterium-depleted water
 * °dH, deutsche Härte, a unit of water hardness
 * Dorsal horn of the spinal cord, or posterior grey column

Sports

 * Designated hitter, a baseball rule
 * Doubleheader (baseball)
 * Doubleheader (television)
 * Downhill (ski competition), a skiing discipline
 * Downhill mountain biking, a bicycling discipline

Transportation

 * de Havilland, a former UK aircraft manufacturer
 * Decision height, in aviation
 * Delaware and Hudson Railway
 * Independence Air (IATA code)

Other uses

 * Dh (digraph), in linguistics
 * Dear husband, a shorthand phrase common in online forums
 * Donor husband
 * Digital humanities, a community of practice combining technology with humanistic inquiry
 * Documentary hypothesis or Wellhausen hypothesis, describing the origins of Judeo-Christian scripture
 * Desperate Housewives, television series
 * Domestic Helper
 * Informal abbreviation for Harry Potter and the Deathly Hallows