Dun

Dun most commonly refers to:
 * Dun gene, which produces a brownish-gray color (dun) in horses and other Equidae
 * Dun (fortification), an ancient or medieval fort

Dun or DUN may also refer to:

Places

 * Dun, Angus, a civil parish in Scotland
 * Dun, Ariège, a commune in southern France
 * Dun, Iran, a village in Hormozgan Province, Iran
 * Dun, Norway, a village in Trøndelag, Norway
 * Dùn, an island of St Kilda, Scotland
 * Dün, a range of hills in Thuringia, Germany
 * Dun or Doon Valley (Hindi: दून) in the Sivalik hills of northern India
 * Dun Bhruichlinn, an Iron Age fort south of Esknish, Islay, Scotland.
 * Dun Borrafiach, an Iron Age broch on the island of Skye, Scotland
 * Dun Glacier
 * Dun Guaidhre, an Iron Age fort southwest of Kilmeny, Islay, Scotland
 * Dun Nosebridge, an Iron Age fort southeast of Bridgend, Islay, Scotland
 * Dun Ringill, an Iron Age hill fort on the Strathaird peninsula on the island of Skye, Scotland
 * Dun Sar, a village in Gatab-e Shomali Rural District, Gatab District, Babol County, Mazandaran Province, Iran
 * Dun-le-Poëlier, a commune in central France
 * Dun-sur-Meuse, a commune in northern France
 * House of Dun, a Scottish estate

Given name or title

 * Consort Dun (1746–1806), Chinese imperial consort
 * Dun Deal (born 1986), American record producer and rapper
 * Dun Mihaka
 * Dun Karm Psaila (1871–1961), Maltese writer and poet
 * Dun Mikiel Xerri (1737–1799)
 * Mao Dun (1896-1981), Chinese writer
 * Xiahou Dun (d. 220), Chinese general and politician

Surname

 * Angus Dun (1892–1971), American clergyman and author
 * Dennis Dun (born 1952), Chinese–American actor
 * Edwin Dun (1848–1931), American agriculturalist
 * Jean Dun (died 1735), French opera singer
 * Josh Dun (born 1988), American musician and drummer of Twenty One Pilots
 * Smith Dun (1906-1979), Burmese Army commander-in-chief
 * Tan Dun (born 1957), Chinese composer
 * William Sutherland Dun (1868–1934), Australian palaeontologist and geologist

Biology

 * Subimago, or dun, a stage in the life cycle of mayflies, especially an artificial fishing fly tied to imitate one

Computing and technology

 * Dial-up networking (DUN) a dialed connection to the Internet via public telephone lines
 * Dial-up Networking Profile, a Bluetooth computer communications profile

Other uses

 * Data Universal Numbering System (DUNS), a unique numeric identifier for businesses
 * Dewan Undangan Negeri (DUN), the legislative assemblies of Malaysian states
 * Dün (band), a French progressive rock band active 1978-1981
 * Dun & Bradstreet, an American credit reporting agency
 * Dun comma or enumeration comma, a Chinese punctuation mark
 * Dun Cow, a brown bovine; a common motif in English folklore
 * Prince Dun, a peerage in Manchu China