Bulgarian Socialist Party

The Bulgarian Socialist Party (, БСП; Bulgarska sotsialisticheska partiya, BSP), known as the Centenarian (Столетницата, Stoletnitsata), is a social-democratic political party in Bulgaria and successor to the Bulgarian Communist Party. The BSP is a member of the Party of European Socialists and Socialist International, and is currently led by Mihail Mikov. It is the leading component of the Coalition for Bulgaria centre-left coalition.