John Benjamin Kogut (6 March 1945 in Brooklyn) is an American theoretical physicist, specializing in high energy physics. Kogut received in 1971 his PhD from Stanford University under James Bjorken with thesis Quantum electrodynamics at infinite momentum: applications to high energy scattering. From 1971 to 1973 he was a visiting scholar at the Institute for Advanced Study and from 1971 to 1977 Assistant Professor of Physics at Cornell University. For 27 years he was on the physics faculty of the Loomis Laboratory at the University of Illinois, Urbana-Champaign, retiring in 2005 as professor emeritus. Since then, he has been a Program Manager at the United States Department of Energy, Office of Science (SC), Office of High Energy Physics.