UD

UD or ud may refer to:

Companies

 * UD Trucks, a Japanese truck manufacturer
 * United Devices, a commercial distributed computing company
 * United Distillers, a whiskey holding company
 * Upper Deck, a manufacturer of collectibles and trading cards
 * Hex'Air (IATA airline designator UD), a French regional airline

Organizations

 * Unificación Democrática, the Democratic Unification political party in Honduras
 * Unión Democrática, a political party in Guatemala
 * Unlock Democracy, a British political organization
 * Utenriksdepartementet, the Norwegian Ministry of Foreign Affairs
 * Utrikesdepartementet, the Swedish Ministry of Foreign Affairs

U.S.

 * University of Dallas, Texas
 * University of Dayton, Ohio
 * University of Delaware
 * University of Dubuque, Iowa
 * University of Detroit Mercy, a Catholic university in Michigan
 * University of Detroit Jesuit High School and Academy, a Catholic secondary school in Michigan

Elsewhere

 * University of Dammam, Saudi Arabia
 * University of Dublin, Ireland
 * University of Durham, U.K.

Other

 * Ud., an abbreviation of the Spanish personal pronoun usted
 * Udonis Haslem, American basketball player nicknamed UD and Captain UD
 * Ud (cuneiform), a sign in cuneiform writing
 * Universal Dependencies, a project in analyzing syntax
 * Unanimous decision, in combat sports
 * Unlawful detainer, or eviction, in property law
 * Urban Dictionary, a crowdsourced online slang dictionary
 * Regional decentralization entity of Udine, a province in Italy whose postal abbreviation is "UD"