This book provides an accessible, balanced introduction to nuclear and particle physics and provides a readable and up-to-date overview of both the theoretical and experimental aspects of the topic. The emphasis is on the phenomenological approach to understanding experimental phenomena. The text opens with an introduction to the basic concepts used in nuclear and particle physics and then moves on to describe their respective phenomenologies and experimental methods. Later chapters explore the interpretation of data via models and theories, including the standard model of particle physics, and the liquid drop model and shell model of nuclear physics. Several applications of nuclear physics are discussed, including nuclear medicine and the production of power from fusion and fission. The book closes with a chapter on outstanding problems, including extensions to the standard model, implications for particle astrophysics, improvements in medical imaging and the prospects for power production. Problems are provided at the end of each chapter and an Appendix of full solutions within the text.