This book is the final volume in the Nature and Cities trilogy, advancing the narrative from nurturing and integrating nature into urbanism to embedding it as the blueprint of city-making. This book argues that the future of resilient and liveable cities depends on treating ecological systems not as supplemental features but as the scaffolding upon which urban life is designed and sustained. Through global case studies, the volume explores how architecture, infrastructure, and public spaces can be reconceived as living ecologies: streets functioning as climate buffers, rooftops as pollinator habitats, and rivers as civic spaces. It highlights how communities, planners, architects, and policymakers can collaborate to create cities that regenerate ecosystems, strengthen resilience, and foster inclusion. By embracing design as dialogue with nature, this volume positions ecological principles as central to long-term climate adaptability and cultural identity. As the culmination of the trilogy, Designing Nature into Cities presents both a vision and a roadmap for regenerative urbanism. It situates itself within global sustainability discourse as a call to rethink urban futures: not as machines for growth, but as living, adaptive ecologies where human and non-human life flourish together.