Accelerators, as research and industrial tools, are increasingly becoming a key driver of the advances of a modern society. As accelerators and our understanding of its science evolve to meet the ever-increasing needs of society, the field of accelerator physics has advanced and deepened over the past few decades, with many of its branches developing 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, these special topics are chosen to present accelerator physics as a diversified and exciting field, and is written based on the practicing and teaching experiences the author has accumulated over the past decades. Presented as a textbook, the material on each topic is intended to be self-contained. The reader is assumed to have a basic knowledge of accelerator physics to put the material in some context.