The Socialist Düstur Party (Tukaric: Sosyalist Düstur Partisi, SDP) was a political party in the Kalopian Republic. The SDP was established on 16 December 4096 by then-President Binali Kırmızıgül, as a continuation of the Motherland Party, which governed the country as a dictatorship from 4058 to 4095. President Kırmızıgül led the party until 4098, when Mustafa Öztükar was chosen as his successor at the 4098 party congress. The party was soundly defeated in its first electoral test, the 4100 general election, thus losing power for the first time in 42 years.