Swapan Chattopadhyay CorrFRSE (born December 26, 1951) is an Indian American physicist. Chattopadhyay completed his PhD from the University of California (Berkeley) in 1982. Currently, Chattopadhyay holds the Presidential Chair of Research, Scholarship and Artistry at Northern Illinois University (NIU) where he is Professor of Physics and Director of Accelerator Research. Concurrently he holds a joint appointment with Fermi National Accelerator Laboratory (Fermilab) where he is a distinguished scientist, member of the director's senior leadership team and director of the Cooperative Research and Development Agreement between Fermilab and NIU.