Accelerators as research and industrial tools are increasingly becoming a key driver of the advances of a modern society. As accelerators and its science evolved to meet the ever-increasing needs of society, the field of accelerator physics has evolved and deepened over the past few decades, and many of its branches developed into special topics of research by their own rights. It is appropriate at this time to start accumulating this hard-earned expertise by the accelerator physics community. With this view, a selection of these special topics is presented in this volume, Special Topics in Accelerator Physics. Although not exhaustive, they are chosen to present accelerator physics as a diversified and exciting field and written based on the practicing and teaching experiences of the author accumulated over the past decades. The book is presented as an advanced textbook. The material on each topic has been intended to be self-contained. The reader is assumed to have a basic knowledge of accelerator physics to put the material in some context.