This publication addresses the growing field of Natural Hydrogen Systems, co-edited by Reza Rezaee and Brian Evans. With a surge in research interest in natural hydrogen and helium, this volume responds to the demand for a comprehensive exploration of hydrogen's natural occurrences, properties, and applications. Covering an array of crucial facets, the book begins with an overview by the editors, setting the stage for an in-depth journey. Chapters unfold to elucidate hydrogen's physical and chemical properties, formation mechanisms, global occurrences, and detection techniques. Experimental investigations, insights from field studies, and a focus on hydrogen as an energy source further enrich the narrative. Environmental impacts, industrial applications, and technological developments are meticulously examined, providing a holistic understanding. The volume concludes with case studies, offering real-world applications and reinforcing theoretical concepts. This book stands as a vital resource for specialists seeking to deepen their knowledge of Natural Hydrogen Systems. With contributions from esteemed researchers, it not only captures the field's current state but also charts a course for future exploration. Its relevance to the target audience lies in its ability to serve as a definitive reference, fostering advancements and innovations in this rapidly evolving domain.