Democratic Union (abbreviated DEU) was a liberal political party in the Czech Republic.

It existed since 1994 and was dissolved in 2002 when it merged with Freedom Union.

[1] The party first participated in 1996 legislative election but failed to reach 5% threshold.

Members of DEU founded a relatively independent platform, whose members later tried, unsuccessfully, to take over the leadership.

[3][4] Platform then left the party and established Democratic Union of the Czech Republic (DEU ČR).