This book provides an overview of the current applications of nanomaterials in brain diseases, and introduces several novel nanomaterials that have excellent potential in this field. During the last two decades, nanotechnology had matured significantly as it has transitioned from a bench-top science to an applied technology. However, the application of nanomaterials in basic and clinical neuroscience is still at an early stage, and understanding how the intrinsic properties of nanomaterials translate to complex biological responses is an area of intensive research. Part 1 of the book focuses on the principles and strategies of nanomedicine in the brain diseases, while part 2 examines the applications of promising nanomaterials for therapy and diagnosis in the brain. Together they offer a comprehensive picture of advances in nanotechnology and their successful use in treating brain diseases in the past 20 years.