The Independent Democratic Union (Unión Democrata Independiente, UDI) is a Chilean right-wing, conservative political party, founded in 1983. Its main inspirer was the lawyer, politician and law professor Jaime Guzmán, a civilian Augusto Pinochet's collaborator, and a senator from 1990 until his assassination on April 1, 1991.
Its ideological origins date back to the Jaime Guzmán's Guildist Movement, born in the Pontifical Catholic University of Chile in 1966, espousing the independence and depoliticization of intermediate bodies of civil society.
UDI, together with National Renewal (RN) and other minor movements, form a coalition of right-wing parties called Coalition for Change, which is the successor to Alliance for Chile and rose to power in March 2010, after the victory in the presidential elections held in January 2010. It is currently the largest political party in Congress.
In the Chilean parliamentary election, 2009, UDI was the first majority in the election of deputies, electing 40 deputies (one third of the House) with a 23.04% (1,507,001 votes), and got a 21.21% (369,594 votes) in the election of senators. Its bench is the largest obtained by a single party in Chile