Bimal Kumar Roy is a former Director of the Indian Statistical Institute. He is a cryptologist from the Cryptology Research Group of the Applied Statistics Unit of ISI, Kolkata. He received a Ph.D. in Combinatorics and Optimization in 1982 from the University of Waterloo under the joint supervision of and . In June 2015 Roy was removed from his post of director of ISI, just one month before the end of his appointment. This action was harshly criticised by the international academic community.