The text book entitled X-RAY DEBYE TEMPERATURE STUDIES OF METALS AND ALLOYS. This book is designed to meet the requirements of research students. This book has been divided into five parts: 1.Theoretical explanation: Theoretical explanation of Debye-Waller factors, Debye temperatures and mean square amplitude of vibrations data included, 2.Experimental: Experimental data with suitable diagrams and equations included 3.Few Additional Chapters : related additional chapters (crystallograpghy-crystal structure, X-ray diffraction, Nanomaterial) added. The Debye-Waller factors and Debye temperatures of crystals are parameters of lattice dynamical interest. The experimental determination of these parameters by the X-ray diffraction technique is the objective of an on-going programme in this book. So far the Debye-Waller factors and Debye temperatures have been determined for a large number of materials possessing different crystal structures. I express my deep sense of gratitude to my beloved teacher and Research Supervisor Prof. N. Gopi Krishna, Department of Physics, Kakatiya University, Warangal for his inspiration, creative encouragement and constructive guidance throughout my work