Textbook in PDF format The search for a theory of quantum gravity is one of the most important and fascinating problems in modern theoretical physics. While we do not have yet a complete theory of quantum gravity, significant advancements have been done in the past decades. In this handbook, every section is dedicated to a specific approach towards a theory of quantum gravity and is edited by the leading experts in the field. This book represents both a valuable resource for graduate students and an important reference for researchers in quantum gravity. Preface. About the Editors. Section Editors. Contributors. Effective Quantum Gravity. Perturbative Quantum Gravity. Asymptotically Safe Quantum Gravity. Nonlocal Quantum Gravity. Supergravity. String Theories. Causal Sets. Causal Dynamical Triangulations. Loop Quantum Gravity and Spinfoams. Index