Social Democratic Union may refer to:
- Social Democratic Union (Croatia)
- Social Democratic Union (Ireland), started by Tommy Broughan in 2014 after he left the Labour Party
- Social Democratic Union (Latvia)
- Social Democratic Union (Serbia)
- Social Democratic Union (Romania)
- Social Democratic Union (Ukraine)
- Social Democratic Union of Macedonia
- Social Democratic Union of Workers and Smallholders, a political party in Finland
- Social Democratic Union 'Proletarian', a political party in Bulgaria
- Social Democratic Unionists, a political party in Syria
- Polish Social Democratic Union, defunct political party in Poland
This disambiguation page lists articles associated with the title Social Democratic Union.If an internal link led you here, you may wish to change the link to point directly to the intended article. Categories: