This book advocates for a fundamental paradigm shift in decision-making, city shaping, and urban living—one that repositions nature as a central actor rather than a passive backdrop. It calls for the integration of ecological systems and recognition of nature’s agency alongside inclusive community participation to create resilient, equitable, and thriving urban environments. Such an approach is essential for cities to adopt transformative strategies that simultaneously address pressing societal challenges—such as climate change, social equity, and public health—while enhancing biodiversity. Nature-based urbanism transcends geographical, political, and cultural boundaries. It is not confined to specific contexts but offers a universal framework for reimagining urban futures. By embedding nature as an active agent of change within planning and governance, this book demonstrates how cities can move beyond conventional sustainability narratives toward regenerative models that foster symbiotic relationships between people and ecosystems.