Rodney Charles Ewing (born September 20, 1946) is an American mineralogist and materials scientist whose research is focused on the properties of nuclear materials.
He is the Frank Stanton Professor in Nuclear Security at the Center for International Security and Cooperation, a Senior Fellow of the Freeman Spogli Institute for International Studies and a Professor in the School of Earth, Energy and Environmental Sciences at Stanford University.
Ewing also currently serves on the Science and Security Board of the Bulletin of the Atomic Scientists.