Robert George Jahn (April 1, 1930 – November 15, 2017) was an American plasma physicist, Professor of Aerospace Science, and Dean of Engineering at Princeton University.
Jahn held a B.S.E. degree in Engineering Physics (1951), a M.A. Degree in Physics (1953), and a Ph.D. degree in Physics (1955), all from Princeton University, and held faculty positions in Physics Department at Lehigh University, at the California Institute of Technology, and, since 1962, at Princeton.