Indian filmmaker who used a range of aesthetic styles to explore the social and political realities of his homeland.

After studying physics at Calcutta University, Sen worked as a journalist, a medicine salesman, and a film sound technician. His interest in both filmmaking and Marxist philosophy stemmed from his association with the Indian People's Theatre Association in the 1940s. His first film, Raat Bhore (The Dawn, 1956), met with little success. Baishey Sravana (The Wedding Day, 1960) and Punascha (Over Again, 1961), both dealing with marital relationships, reflected Sen's political fervour as well as his admiration for the films of the Italian Neorealists (Neorealism) and his colleague Satyajit Ray (Ray, Satyajit).

Several of Sen's films of the 1960s, such as Akash Kusum (Up in the Clouds, 1965), revealed his desire to break free from the conventions of commercial films. Regarded by many as Sen's greatest film, Bhuvan Shome (Mr. Shome, 1969) starred renowned Indian actor Utpal Dutt (Dutt, Utpal) as a lonely bureaucrat who encounters the wife of a ticket collector accused of taking bribes. The film's use of improvisation and sardonic humour and its naturalistic depiction of rural India established it as a landmark of Indian cinema. In his Calcutta trilogy—Interview (1971), Calcutta 71 (1972), and Padatik (The Guerrilla Fighter, 1973)—Sen explored the civil unrest in contemporary Calcutta through stylistic experiments and fragmented narratives. Middle-class morality is examined in two of Sen's most-praised films, Ek Din Pratidin (And Quiet Rolls the Dawn, 1979), which portrays a family in despair over a missing daughter, and Kharij (The Case Is Closed, 1982), concerning a family whose servant has died from carbon monoxide poisoning in their home. Kharij won the Special Jury Prize at the Cannes International Film Festival in 1983. Akaler Sandhane (In Search of Famine, 1980), the story of a film crew documenting the 1943 Bengal famine, won the Silver Bear (Special Jury Prize) at the Berlin International Film Festival in 1981.

By the 1980s Sen was a national figure and was regarded as one of India's most important filmmakers. He continued to explore social concerns in later works such as Mahaprithivi (World Within, World Without, 1992), Antareen (The Confined, 1994), and Aamaar Bhuvan (My Land, 2002).