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, 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 design, ...

, 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 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 cr ...

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

Organizations

Politics

United Democratic Forces The United Democratic Forces ( bg, Обединени Демократични Сили, ОДС/ODS) were a center-right electoral alliance in Bulgaria, led by the Union of Democratic Forces. Members of the coalition 1997 * Union of Democrati ...

(ОДС), an electoral alliance in Bulgaria *

United Democratic Forces of Belarus The United Democratic Forces of Belarus ( be, Аб'яднаныя дэмакратычныя сілы Беларусі; russian: Объединённые демократические силы) is a coalition of political parties that oppose t ...

, 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 Botswana general election, 1994, 1994 parliamentary election. The UDF consisted of the MELS Movement of Botswana, the Botswana Workers Front ...

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

, 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 Nat ...

, 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. He was succeeded by Apius Auchab. History The United Democratic Front is a political party that is most widely ...

United Democratic Front (Pakistan) United Democratic Front ( ur, قومی متحدہ محاذ ) 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 Na ...

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

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 is represented in the Interim Nat ...

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 (french: Union pour la démocratie française, UDF) was a centre to centre-right political party in France. It was founded in 1978 as an electoral alliance to support President Valéry Giscard d'Estaing in order to c ...

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

Military

Ulster Defence Force The Ulster Defence Association (UDA) is an Ulster loyalist paramilitary group in Northern Ireland. It was formed in September 1971 as an umbrella group for various loyalist groups and undertook an armed campaign of almost 24 years as one of t ...

, a paramilitary group in Northern Ireland *

Union Defence Force (South Africa) ) , headquarters = Pretoria, Transvaal, South Africa , commander-in-chief = , commander-in-chief_title = Sovereign of South Africa , minister = , minister_title = , commander = , commander_title = Chief o ...

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

Union Defence Force (UAE) The United Arab Emirates Armed Forces ( ar, القوات المسلحة لدولة الإمارات العربية المتحدة, Al-Quwwāt al-Musallaḥa li-Dawlat al-ʾImārāt al-ʿArabīyyah al-Muttaḥidah) are the armed forces of the Unit ...

, the armed forces of the United Arab Emirates

Other organizations

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

Other uses

Unducted fan A propfan, also called an open rotor engine, or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The design is intended to offer the speed an ...

, a type of jet 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 late ...

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

Ural Delay Factor Ural may refer to: *Ural (region), in Russia and Kazakhstan *Ural Mountains, in Russia and Kazakhstan *Ural (river), in Russia and Kazakhstan *Ual (tool), a mortar tool used by the Bodo people of India *Ural Federal District, in Russia *Ural econo ...

, When your sidecar attracts attention from bystanders, thereby delaying your departure.