The Polish Socialist Party of the Prussian Partition, sometimes Polish Socialist Party in Prussia (Polish: Polska Partia Socjalistyczna Zaboru Pruskiego - German: Polnische Sozialistische Partei in Preußen) - was a Polish political party.
The party was founded in 1893 in Berlin by émigré members of the Polish Socialist Party. Until 1913, the party had formal links with the Social Democratic Party of Germany. Following the restoration of Polish statehood in 1919, the party merged with Polish Socialist Party.
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represented in Sejm