UD

UD may refer to:

Education

University of Dallas, a Catholic university in Texas
University of Dammam, a Saudi university in Dammam, Eastern region of Kingdom of Saudi Arabia
University of Dayton, a university in Ohio
University of Delaware, a university in Delaware
University of Detroit Jesuit High School and Academy, a Catholic secondary school in Michigan
University of Detroit Mercy, a Catholic university in Michigan
University of Dublin, a university in the Republic of Ireland
University of Dubuque, a Presbyterian university in Iowa
University of Durham, a university in the United Kingdom

UD Trucks, a Japanese truck manufacturer
United Devices, a commercial distributed computing company that focuses on CPU scavenging and enterprise cluster management
United Distillers, a whiskey holding company
Upper Deck, a manufacturer of collectibles and trading cards
Hex'Air (IATA airline designator)

Ulster Defence Regiment Medal, a UK military medal
Unanimous decision, usually referring to combat sport victories
Unificación Democrática, the Democratic Unification political party in Honduras
Unión Democrática, the Democratic Union political party in Guatemala
Union Democrática, the Democratic Union, political party in Argentina
Universal Declaration of Human Rights, a declaration adopted by the United Nations General Assembly
Unlock Democracy
Urban Dictionary, an online reference for slang terminology
Utenriksdepartementet, the Norwegian Ministry of Foreign Affairs
Utrikesdepartementet, the Swedish Ministry of Foreign Affairs