The Socialist Party of Labour (Romanian: Partidul Socialist al Muncii, PSM) was a left wing-nationalist political party in Romania. The party was labelled as neo-communist. It was founded on 16 November 1990. The chairman of the party was Ilie Verdeţ, former Communist Prime Minister between 1979 and 1982, under Secretary General Nicolae Ceaușescu.^[1]

At the 1992 general election, the party obtained roughly 3% of votes and thus entered the parliament. Together with the Greater Romania Party (PRM), the PSM formed the "National Bloc" faction in the Romanian Senate. The PSM participated in the so-called Red Quadrilateral coalition that included Iliescu's Democratic National Salvation Front (FDSN), the Greater Romania Party (PRM; at that time national communist), the Agrarian Democracy Party (PDAR), and the nationalist Romanian National Unity Party (PUNR).^[2]

Later, the Socialist Party of Labour (PSM) gradually lost its influence. In July 2003, the party fused with the Social Democratic Party (PSD); members who objected to the fusion formed a splinter group, called the Socialist Alliance Party (PSR).