Party of Bulgarian Social Democrats

The Party of Bulgarian Social Democrats (партия Български социалдемократи, Partiya Balgarski Sotsialdemokrati, PBSD) is a social-democratic political party in Bulgaria.

The party emerged from a left-wing split within the Bulgarian Social Democratic Party. Leader Petar Dertliev pursued an alliance with the centre-left Coalition for Bulgaria, while the party's right-wing continued to hold ties with the United Democratic Forces and kept the original name.