Niranjan Sengupta(26 July 1904 – 4 September 1969) was a Bengali Indian revolutionary, a freedom fighter, and later on, a leader of the Communist Party of India (Marxist). He associated with the Anushilan Samiti. Born in Barisal district, he became active in the nationalist movement during his student years at Ripon College. He sought to unify various revolutionary groups in Bengal and organized arms procurement efforts from his Mechhuabazar residence. Arrested in a police raid, he was sentenced to seven years of rigorous imprisonment in the Cellular Jail. His incarceration transformed him ideologically, leading him to adopt Marxism and work as a communist activist in post-independence India.