The understanding of heat transport processes in small dimensions and timescales is imperative when exploring the unlimited potential that nanotechnology has to offer in areas, such as micro-nanoelectronics, MEMS, and NEMS. In recent years, there has been a great deal of interest in this area, and this is reflected by a surge in the number of research publications and books on this subject. The field of microscale and nanoscale heat transport is quite interdisciplinary, requiring fundamental knowledge of quantum mechanics, statistical thermodynamics, energy states in solids, and classical heat transfer. This book addresses the fundamentals of microscale and nanoscale transport in various fields of current interest, such as thermal dissipation from electronic devices, thermoelectric energy conversion devices, and microelectromechanical systems (MEMS) and sensors. This book is written in an easy-to-comprehend manner to cover all the above-mentioned topics without warranting prerequisites from the interested reader. Students from diverse backgrounds such as mechanical, aerospace, and electrical engineering may find it very helpful as a graduate-level course on this subject, while practicing engineers may find this book as a very useful reference.