Socialist Alliance Party (Romanian: Partidul Alianţa Socialistă) is a political party in Romania. It developed out of the wing of the Socialist Party of Labour (PSM) that objected to the merger of PSM with the Social Democratic Party in July 2003 and wanted PSM to continue to exist as a Marxist party. Romanian authorities did not recognize this group as PSM, and instead it took the name PAS.
The party is led by an 165-member National Committee, a 60-member Directive Committee and a 60-member Executive Bureau.
PAS is a founding member of the Party of the European Left.