Achintya Kumar Sengupta (born 19 September 1903 – 29 January 1976) was an Indian Bengali-language writer. He started writing under a pen name, ‘Niharika Debi’. He contributed to almost all genres of Bengali literature, but is best remembered for his novels and short stories. In all, he wrote more than 100 books. Sengupta was closely associated with the famous magazine Kallol, and was its editor for some time.