The Socialist Party of Bangladesh (Bengali: বাংলাদেশের সমাজতান্ত্রিক দল, abbreviated 'বাসদ', 'BASAD', or 'SPB') is a anti-revisionist Marxist-Leninist communist party in Bangladesh. The party was founded by Comrade Khalequzzaman on 7 November 1980. In 2013 a group of members under the leadership of Mubinul Haider Chowdhury broke away from the party and formed the Socialist Party of Bangladesh (Marxist) over disagreement on recognition of the thought of Shibdas Ghosh and Ganajagaranmancha.