Bolted joints are commonly used in various mechanical systems as one of the most prevalent and crucial fasteners for transmitting loads and maintaining the structural integrity of the system. The inherent nonlinearities of joint interfaces caused by fretting friction and wear significantly affect the dynamic response of the assembly, resulting in complex dynamic behaviours. A better understanding and accurate quantification of the mechanics of joint interfaces will contribute to analysing the dynamic characteristics of bolted joint structures, enabling engineers to design mechanical structures with high performance and efficiency. This book will introduce the latest research on friction and wear at bolted joint interfaces and explore the interface mechanics behaviour and modelling methods of bolted joints.