The Democratic Union of Slovakia (Slovak: Demokratická únia Slovenska, DEÚS) was a political party in Slovakia led by Jozef Moravčík.
The party was created on 23 April 1994 by a merger of Alternative Political Realism and the Alliance of Democrats of Slovakia. In the parliamentary elections in September/October that year the party received 8.6% of the vote, winning 15 of the National Council.
On 25 March 1995 the party merged with the National Democratic Party to form the Democratic Union.