John Lawrence Cardy FRS is a British theoretical physicist at the University of Oxford. He is best known for his work in theoretical condensed matter physics and statistical mechanics, and in particular for research on critical phenomena and conformal field theory.
He was an undergraduate and postgraduate student at the University of Cambridge, before moving to the University of California, Santa Barbara, where he joined the faculty in 1977. In 1993, he moved to the University of Oxford, where he is a Fellow of All Souls College and a Professor of Physics in the Rudolf Peierls Centre for Theoretical Physics.
He was elected as a Fellow of the Royal Society in 1991, received the Dirac Medal of the IoP in 2000, was awarded the Lars Onsager Prize by the APS in 2004, the Boltzmann Medal by IUPAP in 2010, and the Dirac Medal of the International Centre for Theoretical Physics in 2011.
He is most known for his contributions to conformal field theory. The famous Cardy formula is named after him.