UDF may refer to:

Astronomy

Ultra Deep Field The Hubble Ultra-Deep Field (HUDF) is a List of deep fields, deep-field image of a small region of outer space, space in the constellation Fornax, containing an estimated 10,000 galaxies. The original data for the image was collected by the Hub ...

, a view of the distant universe taken in 2004 by the Hubble space telescope **

UDF 423 UDF 423 is the Hubble Ultra Deep Field (UDF) identifier for a distant spiral galaxy. With an apparent magnitude of 20, UDF 423 is one of the brightest galaxies in the HUDF and also has one of the largest apparent sizes in the HUDF. Distance m ...

, a distant spiral galaxy ** UDF 2457, a red dwarf star

Computing

Universal Disk Format Universal Disk Format (UDF) is an open, vendor-neutral file system for computer data storage for a broad range of media. In practice, it has been most widely used for DVDs and newer optical disc formats, supplanting ISO 9660. Due to its desig ...

, an operating-system-independent file system commonly used on DVD and other digital media *

Uniqueness Database File In Microsoft Windows system administration, a Uniqueness Database File (UDF) is a text file utilized by administrators to supply unique information specific to each computer or user. This functionality is particularly important when deploying oper ...

, a Windows XP Professional configuration text file *

User-defined function A user-defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. UDFs are usually written for the requirement of its c ...

, a function provided by the user of a program or environment

Organizations

Politics

United Democratic Forces The United Democratic Forces (, ОДС/ODS) were a center-right electoral alliance in Bulgaria, led by the Union of Democratic Forces. Members of the coalition 1997 * Union of Democratic Forces (''Sayuz na Demokratichnite Sili'') * Bulgarian ...

(ОДС), an electoral alliance in Bulgaria *

United Democratic Forces of Belarus The United Democratic Forces of Belarus (; ) is a coalition of political parties that oppose the presidency of Alexander Lukashenko, who has been in power since 1994. It was the main opposition group during the 2006 Belarusian presidential elec ...

, a coalition of political parties participating as the main opposition group during the 2006 presidential election *

United Democratic Front (Botswana) The United Democratic Front (UDF) was a coalition of opposition parties in Botswana, formed ahead of the 1994 parliamentary election. The UDF consisted of the MELS Movement of Botswana, the Botswana Workers Front and the Social Democratic Party ...

United Democratic Front (Kerala) The United Democratic Front (UDF) is the Indian National Congress-led alliance of centre to centre-right political parties in the Indian state of Kerala. It is one of the two major political alliances in Kerala, the other being Communist Part ...

, India *

United Democratic Front (Mizoram) United Democratic Front is a front of eight political parties (Mizo National Front, Mizoram People's Conference, Zoram Nationalist Party, Maraland Democratic Front, Hmar People's Convention, Paite Tribes Council, Bharatiya Janata Party, and ...

, India *

United Democratic Front (Malawi) The United Democratic Front is a political party in Malawi founded in 1992 by Bakili Muluzi. It claims to be a liberal party in Malawi and is mainly strong in the southern region populated by ethnic Yao. Bakili Muluzi was President of Malawi ...

United Democratic Front (Namibia) The United Democratic Front (UDF) is a political party in Namibia. Justus ǁGaroëb founded the party in 1989 and led it until 2013. The party president since January 2024 is Hendrik Gaobaeb. The UDF in the National Assembly (2 seats) and t ...

United Democratic Front (Pakistan) United Democratic Front () was formed in Pakistan on 28 February 1973 in opposition to ruling Pakistan Peoples Party of Prime Minister Zulfikar Ali Bhutto. This was a coalition of eight opposition parties in the National Assembly and Senate comprisi ...

United Democratic Front (South Africa) The United Democratic Front (UDF) was a South Africa, South African popular front that existed from 1983 to 1991. The UDF comprised more than 400 public organizations including Trade union, trade unions, Students' union, students' unions, wom ...

United Democratic Front (South Sudan) The United Democratic Front (Juba Arabic: جبهة الديمقراطية المتحدة ''Jabhet Al-Dimoqratiyet Al-Mutahedat'') is a political party in South Sudan. It is led by Peter Abdurahman Sule. The party was previously represented in the ...

United Democratic Forum Party The United Democratic Forum Party (UDF) was a political party in Kenya. History The party was founded in 2012, by a cross section of younger members of Kenya's 10th parliament under the premise of steering reforms to Kenya's governance and boosti ...

, a former political party in Kenya * ''

Union pour la Démocratie Française The Union for French Democracy ( ; UDF) was a centre-right political party in France. The UDF was founded in 1978 as an electoral alliance to support President Valéry Giscard d'Estaing in order to counterbalance the Gaullist preponderance over th ...

'' (Union for French Democracy), a former centrist pro-European French political party

Military

Ulster Defence Force The Ulster Defence Association (UDA) is an Ulster loyalism, Ulster loyalist paramilitary group in Northern Ireland. It was formed in September 1971 as an umbrella group for various loyalist groups and Timeline of Ulster Defence Association act ...

, a paramilitary group in Northern Ireland *

Union Defence Force (South Africa) The Union Defence Force (UDF) () comprised the Military, armed forces of South Africa from 1 July 1912, when the Defence Act (No 13 of 1912) took effect, two years after the creation of the Union of South Africa, until 1957 when it was reorgani ...

, the predecessor of the South African Defence Force from 1912 to 1957 *

Union Defence Force (UAE) The United Arab Emirates Armed Forces () are the armed forces of the United Arab Emirates. They consist of the UAE Army, UAE Navy, UAE Air Force, UAE Presidential Guard, UAE Joint Aviation Command, and the UAE National Guard. They were nic ...

, the armed forces of the United Arab Emirates

Other organizations

United Dairy Farmers United Dairy Farmers (UDF) is an American chain of shops offering dairy products as well as coffee and gasoline. UDF was started by Carl Lindner Sr. and his children in 1938. Almost as soon as they started operations, the Lindners began work on ...

, an American chain of ice cream shops

Other uses

* Unducted fan, another name for a

propfan A propfan, also called an open rotor engine, open fan engine is an aircraft engine combining features of turbofans and turboprops. It uses advanced, curved propeller blades without a ducted fan, duct. Propfans aim to combine the speed capabili ...

engine * United Defense Force, a fictional global military in the manga ''

All You Need Is Kill ''All You Need Is Kill'' is a Japanese science fiction light novel by Hiroshi Sakurazaka with illustrations by Yoshitoshi Abe. The book was published in Japanese by Shueisha under their Super Dash Bunko imprint in December 2004, and was la ...

'' and its film adaptation ''Edge of Tomorrow''