Arthur Marshall Stoneham, FRS (May 18, 1940 Barrow, Cumbria, UK – February 18, 2011), known as Marshall Stoneham, was a British physicist who worked for the United Kingdom Atomic Energy Authority, and from 1995 was Massey professor of physics at University College London. He was the author of several books that became influential within the field, including Theory of Defects in Solids (1975).
He was a fellow of the Institute of Physics, the American Physical Society, and the Royal Society, and in 2006 was awarded the Guthrie Medal and Prize of the Institute of Physics. Stoneham was elected President of the Institute of Physics in 2010 and died during his term in office.
Stoneham obtained his B.Sc. in physics from Bristol University in 1961, and his Ph.D. in 1964.