Revolutionary Socialist Party (RSP) is a communist party in India. The party was founded on 19 March 1940 by Tridib Chaudhuri and has its roots in the Bengali liberation movement Anushilan Samiti and the Hindustan Socialist Republican Army.

Anushilan Samiti was an Indian fitness club, which was actually used as an underground society for anti-British revolutionaries. In the first quarter of the 20th century it supported revolutionary violence as the means for ending British rule in India. The organisation arose from a conglomeration of local youth groups and gyms (akhara) in Bengal in 1902. It had two prominent, somewhat independent, arms in East and West Bengal, Dhaka Anushilan Samiti, and the Jugantar group.