This handbook provides a comprehensive overview of terrestrial ecohydrology, a rapidly evolving discipline focusing on the interactions of biota and water. Understanding these interactions is especially important given the pace and scale of environmental change, with climate warming, deforestation, land-use change, groundwater depletion, urbanization, and other human activities are fundamentally reshaping how water is partitioned among evaporation, transpiration, interception, infiltration, storage, and runoff. Addressing these issues, the Routledge Handbook of Terrestrial Ecohydrology provides a thorough introduction to the concepts, methods, and questions that define terrestrial ecohydrology, and presents a comprehensive overview of the state of the science as it is being applied around the world. The handbook is organized into seven parts: Part 1: Ecohydrology and Water Fluxes Across Scales Part 2: Ecohydrology Theory Part 3: Biomes in Transition Part 4: Ecohydrology of Managed Ecosystems Part 5: Fauna and Ecohydrology Part 6: Methods in Ecohydrology Part 7: Ecohydrology and Society Presenting a global view, with established and up and coming international contributors, the handbook showcases how ecohydrology has matured into a vibrant, problem-driven field that is central to understanding and managing water in a rapidly changing world. The handbook concludes by weaving insights, offering design rules, measurement portfolios, and open questions that link local interventions to downstream and downwind benefits for society. The handbook is essential reading for students, scholars, practitioners, and policymakers working in the field of ecohydrology.