The Relativity & Gravitation Group is part of the Department of Applied Mathematics and Theoretical Physics, which in turn is part of the Faculty of Mathematics of the University of Cambridge. The group was founded by Dennis Sciama in 1961, and is currently headed by Professor Paul Shellard. Its activities are closely linked with the Stephen Hawking Centre for Theoretical Cosmology (CTC), with which a number of webpages are shared: www.ctc.cam.ac.uk. CTC supports related research activities on cosmology and black holes, including running conferences and topical workshops and supporting visitors and postdoctoral fellowships.

The Relativity and Gravitation group (GR group) is internationally renowned for a number of important developments in Einstein's classical theory of gravitation, including the no hair and area theorems for black holes and the theorems indicating that singularities would occur both in gravitational collapse and at the beginning of the expansion of the Universe.

The group has expertise in the areas of fundamental theory related to quantum gravity, black holes, gravitational waves, numerical relativity, cosmology, inflation, cosmic strings, the cosmic microwave background and large-scale structure. In recent years the group's main effort has been towards the inclusion of quantum effects, and the development of a theory of quantum gravity; in particular, the semi-classical quantization of black holes (leading, e.g, to the discovery of the thermal radiation produced by them) and the formulation of the Euclidean path integral approach to quantum gravity (leading to the no boundary condition for the Universe).