Politics
- Ulster Defence Force, a loyalist paramilitary group in Northern Ireland
- Union Defence Force (disambiguation)
- Union of Democratic Forces, the name of a number of political parties
- Union for French Democracy or Union pour la Démocratie Française, a centrist French political party
- Union of Democratic Forces (СДС), a political party in Bulgaria
- 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, the name of several political parties.
- United Democratic Front (South Africa), a former anti-Apartheid movement in South Africa
Read more about this topic: UDF