Leo Philip Kadanoff was an American physicist. He was a professor of physics at the University of Chicago and a former president of the American Physical Society (APS). He contributed to the fields of statistical physics, chaos theory, and theoretical condensed matter physics.

The Isaac Newton Medal and Prize is a gold medal awarded annually by the Institute of Physics (IOP) accompanied by a prize of £1,000. The award is given to a physicist, regardless of subject area, background or nationality, for outstanding contributions to physics. The award winner is invited to give a lecture at the Institute. It is named in honour of Sir Isaac Newton.