The Party of Bulgarian Social Democrats (Bulgarian: 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[1] and kept the original name.