In the context of the profound environmental, social, and cultural transformations shaping the contemporary world, the relationship between human beings and nature emerges as one of the central challenges in the design of living environments. Forest Therapy addresses this issue by exploring the growing convergence between health, nature, and design disciplines, placing the role of natural ecosystems at the core as a fundamental resource for psychophysical well-being and for interspecific balance among individuals, communities, and the environment. Through an interdisciplinary approach integrating architecture, landscape design, urban planning, representation, and environmental sciences, the volume investigates Forest Therapy as both a theoretical framework and a practical approach grounded in a synergistic relationship with nature, capable of fostering processes of regeneration, ecological awareness, and social cohesion. The collected contributions offer theoretical reflections, methodological approaches, and internationally oriented case studies, highlighting the value of natural environments as active agents in the design of resilient, inclusive, and well-being-oriented spaces. Particular attention is devoted to the experiential and perceptual dimensions of the relationship with the natural environment, examined as essential components of processes of care, prevention, and psychophysical regeneration. The contributions analyze the significance of direct contact with nature and immersive environmental practices as devices capable of strengthening individual awareness, social relationships, and a sense of place and belonging. By framing Forest Therapy within the broader perspective of planetary health, the volume positions itself as a tool for critical and operational reflection aimed at designers, researchers, and policymakers, offering interpretative keys to guide future strategies for the design of living environments from a sustainable, inclusive, and regenerative perspective.