Epaminondas George Aristotle Alexander Stassinopoulos (born 17 January 1921) is a German-born Greek astrophysicist. He was the retired head of the Radiation Physics Office and Emeritus Astrophysicist at the National Aeronautics and Space Administration (NASA)'s Goddard Space Flight Center in Greenbelt, Maryland. He is the author of many papers and articles in the field of space radiation.