Advances in Biohydrogen and Bioenergy: Sustainable Pathways, Waste Valorisation, and Emerging Technologies delves into the transformative potential of biohydrogen production, microbial fuel cells, and various thermal processes, emphasizing their role in converting organic waste and wastewater into valuable energy sources. With contributions from leading experts, the book combines foundational knowledge with practical insights, case studies, and future directions. The book is structured into four sections. It begins with an introduction to biohydrogen and bioenergy, covering the fundamentals of bioenergy from waste and the principles of biohydrogen production. The second section explores key technologies for bioenergy production, including microbial fuel cells, microbial electrolysis cells, and thermal conversion processes such as hydrothermal treatment and gasification for biogas production. The third section focuses on feedstock and waste valorisation, discussing the use of organic waste and algae in bioenergy systems. Finally, the book addresses the integration and practical applications of these technologies, examining system integration, economic viability, and policy considerations. Advances in Biohydrogen and Bioenergy: Sustainable Pathways, Waste Valorisation, and Emerging Technologies is a vital resource for a diverse audience, including researchers in chemical engineering, biotechnology, and environmental engineering, as well as industry professionals and policy-makers.