The book Comprehensive Engineering Thermodynamics is a book that will be suitable for engineering students committed to mastering engineering thermodynamics. The book covers in detail both the principles, theory, and applications of engineering thermodynamics. The book is divided into sections dealing with Principles and theory of engineering thermodynamics and subsequent sections on applied engineering covering in detail work processes and systems and heat transfer processes. Attempts have been made to simplify the thermodynamics concepts with the student being guided systematically through the concepts and mathematical manipulations.Thermodynamics requires practice if the student is to master the subject.The book can be used for both undergraduate and postgraduate teaching at the university level.