The Party of Democratic Socialism was a left-wing populist political party in Germany active between 1989 and 2007. It was the legal successor to the communist Socialist Unity Party of Germany (SED), which ruled the German Democratic Republic as the de facto sole legal party until 1990. From 1990 through to 2005, the PDS had been seen as the left-wing "party of the East". While it achieved minimal support in western Germany, it regularly won 15% to 25% of the vote in the eastern new states of Germany, entering coalition governments with the Social Democratic Party of Germany in the federal states of Mecklenburg-Vorpommern and Berlin.

Left-wing populism, also called social populism, is a political ideology that combines left-wing politics with populist rhetoric and themes. Its rhetoric often includes elements of anti-elitism, opposition to the Establishment, and speaking for the "common people". Recurring themes for left-wing populists include economic democracy, social justice, and scepticism of globalization. Socialist theory plays a lesser role than in traditional left-wing ideologies.