Jan Charles "John" Zarnecki, FRAS FInstP (born 6 November 1949 in Finchley, Middlesex, England) is an English space science professor and researcher. Since 2013, Zarnecki has been a Director of the International Space Science Institute (Berne, Switzerland). Between 2004 and 2013 he was a Professor of Space Science (now Emeritus) at the Open University, having previously been a professor and researcher at the University of Kent.