Sumit Ranjan Das (born 11 December 1955) is a US-based Indian high energy physicist and a professor at the University of Kentucky. Known for his research on string theory, Das is an elected fellow of the Indian Academy of Sciences. The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards, for his contributions to physical sciences in 1998.