The Social Democratic Union (Bosnian: Socijaldemokratska Unija, SDU) is a minority interest political party in Kosovo representing Bosniaks.

The party participated in the 2021 parliamentary elections and won one of the three guaranteed seats for Bosniaks in the Assembly of Kosovo with 2,549 votes.

The party ran in the 2021 parliamentary election getting 2,549 votes, initially failing to get any representation in the Assembly.

However, the party made a complaint to the Election Complaints and Appeals Panel (PZAP in Albanian) over the irregularity of votes received by the Vakat Coalition and the United Community led by Adrijana Hodžić.

This meant that the United Community did not receive enough votes to enter the parliament, while SDU gained representation in the Assembly winning 1 seat.