Mohit Sen (Bengali: মোহিত সেন) born on 24 March 1929, in Calcutta, and died in Hyderabad on 3 May 2003 was a communist intellectual. He was general secretary of the United Communist Party of India at the time of his death.
Sen was born into a progressive and westernised Brahmo Samaj family. His father, Justice Amarendra Nath Sen, was a judge of the Calcutta High Court and his mother, Mrinalini Sen (née Sinha), was an eminent dancer. His paternal grandfather was an Advocate General of Burma. His maternal grandfather was Major N.P. Sinha, a member of the Indian Medical Service and his mother's elder uncle was Lord Satyendra Prasanno Sinha, the first Indian Governor of Bihar. On his mother's side he came from the zamindari family of Raipur in Birbhum, a district in present-day West Bengal. He had five other brothers, the eldest of whom was Sh. Pratap Chandra Sen, a student of history at Presidency College, Calcutta, who rose to a high position in a mercantile firm in Calcutta in spite of remaining a closet communist. Mohit Sen had his early education at the Presidency College, Calcutta, where he was a student of Professor Susobhan Sarkar. Later he studied at the University of Cambridge, UK.
While in Cambridge, in 1948, he joined the Communist Party of India (CPI) as a 'candidate-member'. Also in Cambridge he met and married Vanaja Iyengar, who became an eminent mathematician later, in 1950. After marriage the couple moved to the People's Republic of China. Sen went to the China International Communist School in Beijing between 1950 and 1953. After his return to India, Mohit Sen worked in the CPI central office in New Delhi and also for its publishing house during 1953–62. Later he became party organiser and teacher in Andhra Pradesh.