UDF
# UDF

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

## Computing

* 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

## Organizations

### Politics

* 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

### Military

* 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

### Other organizations

* United Dairy Farmers, an American chain of ice cream shops

## Other uses

* 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.
