UDF

Look up UDF in Wiktionary, the free dictionary.

UDF may refer to:

Astronomy

Ultra Deep Field, a view of the distant universe taken in 2004 by the Hubble space telescope
- UDF 423, a distant spiral galaxy
- UDF 2457, a red dwarf star

Universal Disk Format, an operating-system-independent file system commonly used on DVD and other digital media
Uniqueness Database File, a Windows XP Professional configuration text file
User-defined function, a function provided by the user of a program or environment

United Democratic Forces (ОДС), an electoral alliance in Bulgaria
United Democratic Forces of Belarus, a coalition of political parties participating as the main opposition group during the 2006 presidential election
United Democratic Front (Botswana)
United Democratic Front (Kerala), India
United Democratic Front (Mizoram), India
United Democratic Front (Malawi)
United Democratic Front (Namibia)
United Democratic Front (Pakistan)
United Democratic Front (South Africa)
United Democratic Front (South Sudan)
United Democratic Forum Party, a former political party in Kenya
Union pour la Démocratie Française (Union for French Democracy), a former centrist pro-European French political party

Ulster Defence Force, a paramilitary group in Northern Ireland
Union Defence Force (South Africa), the predecessor of the South African Defence Force from 1912 to 1957
Union Defence Force (UAE), the armed forces of the United Arab Emirates

Unducted fan, another name for a propfan engine
United Defense Force, a fictional global military in the manga All You Need Is Kill and its film adaptation Edge of Tomorrow
Ural Delay Factor, When your sidecar attracts attention from bystanders, thereby delaying your departure.