Change from Below, Democratic Union of Slovakia (sometimes translated as Change from the Bottom or Change from the Bottom Up; Slovak: Zmena zdola, Demokratická únia Slovenska, ZZ, DÚ), in the years 2000—2002 Liberal Democratic Union (abbreviation LDÚ), and 2002—2010 Democratic Union of Slovakia (abbreviation DÚ), is a non-parliamentary political party in Slovakia since 2000.

Its chairman Ján Budaj is a member of the National Council of the Slovak Republic elected on the OĽaNO party's list of candidates.

The group was led by Ján Budaj, who was elected chairman of the party on the founding republican committee on November 4, 2000.

The party was registered with the Ministry of the Interior on September 7, 2000, under the original name of the Liberal Democratic Union.

As the party has not run for the National Council of the Slovak Republic independently since 2012, the Statistical Office of the Slovak Republic does not record its preferences.