Bulgarian Social Democratic Party

The Bulgarian Social Democratic Party (Bulgarian: Българска социалдемократическа партия, Balgarska Sotsialdemokraticheska Partiya, BSDP) is a social democratic political party in Bulgaria.

It is part of the Blue Coalition, an alliance led by the Union of Democratic Forces. At the last legislative election in 2009, the alliance won 6.8% of the popular vote and 15 out of 240 seats.