Self-Defence of the Republic of Poland

Self-Defence of the Republic of Poland (Polish: Samoobrona Rzeczpospolitej Polskiej, SRP) is a nationalist, socialist, populist, and agrarian political party and trade union in Poland. The party promotes agrarian socialist and Catholic socialist economic policies combined with a left-wing populist, anti-globalization and anti-neoliberal rhetoric. The party describes itself as left-wing, although it stresses that it belongs to the "patriotic left" and follows Catholic social teaching. The party is sympathetic to Communist Poland, which led political scientists to label the party as neocommunist, post-communist, and far-left.

Though considered a "political chameleon", Self-Defence of the Republic of Poland is generally regarded as a left-wing party by historians and political scientists. According to Andrzej Antoszewski, Self-Defence was a radical left-wing party that by postulating the need to stop privatisation and protect workers' interests, often overlapped with neo-communist parties. In English-language literature, the party is described as a radical left-populist party. In the wake of the SLD's electoral defeat in 2005, Self-Defence was sometimes referred to as the "new left". It was also called a left-wing party with a populist-agrarian face. Political scientists also described it as socialist, allowing it to form alliances with the Democratic Left Alliance. On the other hand, its anti-neoliberal and nationalist narrative also allowed it to briefly cooperate with PiS and LPR in 2005.

Founded by Andrzej Lepper in 1992, the party initially fared poorly, failing to enter the Sejm. However, it was catapulted to prominence in the 2001 parliamentary election, winning 53 seats, after which it gave confidence and supply to the Democratic Left Alliance government. It elected six MEPs at the 2004 European election, with five joining the Union for Europe of the Nations and one joining the PES Group.

It switched its support to Law and Justice (PiS) after the 2005 election, in which it won 56 seats in the Sejm and three in the Senate. Lepper was appointed Deputy Prime Minister in the coalition government with PiS and the League of Polish Families. In 2007, he was dismissed from his position and the party withdrew from the coalition. This precipitated a new election, at which the party collapsed to just 1.5% of the vote: losing all its seats. On August 5, 2011, the Party's leader, Andrzej Lepper, was found dead in his party's office in Warsaw. His death was ruled a suicide by hanging.