Robert M. Wald The Thermodynamics of Black Holes We review the present status of black hole thermodynamics. Our review includes discussion of classical black hole thermodynamics, Hawking radiation from black holes, the generalized second law, and the issue of entropy bounds. A brief survey also is given of approaches to the calculation of black hole entropy. We conclude with a discussion of some unresolved open issues. 2001-02-13 2001-07-09 Euclidean methods variational methods thermodynamics black hole thermodynamics Hawking radiation event horizons Killing horizons statistical mechanics quantum field theory entropy bounds quantum gravity black holes generalized second law lrr-2001-6 Max Planck Institute for Gravitational Physics