Johannes Orphal is a German physicist. He is Head of Division 4 "Natural and Built Environment" and Full Professor of Physics at the Karlsruhe Institute of Technology (KIT). From 2009 to 2020 he was Director of the Institute of Meteorology and Climate Research (IMK) at KIT. Until 2009, he was Professor at the University of Paris-Est in Créteil and research scientist at the CNRS.