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 Dundonald House, a governmental building in Northern Ireland

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) Timor (vehicle registration prefix DH)

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

See also Degrees of general hardness (dGH), a unit of water hardness Dirham, a unit of currency in several Arab states Moroccan Dirham abbreviated as Dh United Arab Emirates dirham, unofficially abbreviated DH