Siva Brata (Sibabrata) Bhattacherjee (1921-2003) was a professor of Physics at the University of Calcutta and a crystallographer. He studied with the physicist Satyendra Nath Bose (creator of the Bose–Einstein statistics) and completed his doctorate under his guidance. In 1945 he joined the Khaira Laboratory of Physics at the University College of Science, Calcutta and made important contributions to the field of X-ray crystallography. Bhattacherjee also served as a faculty member of the Department of Technology at the University of Manchester.
He was married to crystallographer and mineralogist Lilabati Bhattacharjee, who served as a Senior mineralogist at the Geological Survey of India, and later went on to serve as the Director of the organisation. He is survived by their son Dr Subrata Bhattacherjee and daughter Mrs Sonali Karmakar.