Panhellenic Socialist Movement

The Panhellenic Socialist Movement (, ), known mostly by its acronym PASOK (; , ), is a social-democratic political party in Greece. Until 2012 it was one of the two major parties in the country, along with New Democracy, its main political rival. After a decade of poor electoral outcomes, PASOK has retained its position as one of the main Greek political parties and is currently the second largest party in the Greek Parliament.

Following the collapse of the Greek military dictatorship of 1967–1974, PASOK was founded on 3 September 1974 as a socialist party. Formerly the largest left-of-center party in Greece between 1977 and 2012, it was the dominant political party of the country from 1981 to 2004, under party founder Andreas Papandreou and Costas Simitis. Last elected to power in 2009, PASOK lost much of its popular support as a result of the Greek debt crisis. PASOK was the ruling party when the economic crisis began, and it negotiated the first Greek bailout package with the European troika, which necessitated harsh austerity measures. This caused a significant loss in the party's popularity. It was part of two coalition governments from 2011 to 2015, during which further austerity measures were taken in response to the crisis. Due to these measures and the crisis, PASOK went from being the largest party in the Hellenic Parliament with 160 seats (43.92% of the popular vote) in the 2009 election to being the smallest party with 13 seats (4.68% of the popular vote) in the January 2015 election. This decline became known as Pasokification.