György Marx (born 25.05.1927) is a Hungarian theoretical physicist and a corresponding member of the Hungarian Academy of Sciences (1970). He was born in Budapest. He graduated from the University of Budapest. From 1948 he has worked at the Institute of Theoretical Physics of the University of Budapest (professor from 1961).
His work concerns quantum and statistical mechanics, atomic and nuclear physics, relativistic mechanics and electrodynamics, and the theory of elementary particles. Independently of others he discovered (1952) the law of conservation of lepton number. He was one of the first to consider the role of the rest mass of the neutrino in cosmology.