Designing Nature into Cities advances an urgent agenda for reimagining the human–nature relationship in urban planning and design through the lens of environmental ethics and social justice. The book examines how cities have historically engaged with nature, the current pressures on this connection, and innovative approaches for building sustainable urban futures. It is a call to action for the planning, design, and development of places that humans live, work, and play across the world. Structured into three interconnected parts, the volume articulates actionable pathways—embedding biophilic metrics in master plans, advancing participatory planning, integrating data for evidence-based decision-making, and securing policy coherence and cross-sectoral and multidisciplinary coordination and collaboration—that move beyond symbolic greening towards sustainable, context-sensitive practice. Drawing on case studies from across the world, including examples from both developed and developing countries, the book demonstrates how nature-based solutions can be embedded across scales: from building materials and planting strategies to public space, heritage precincts, and metropolitan areas. The part “Edge Ecologies: Coasts and Deserts” particularly highlights the growing role of nature-based solutions in strengthening climate resilience in vulnerable regions. This book serves as a valuable resource for students and researchers in geography, environmental studies, architecture, design, and urban planning. It offers both conceptual clarity and practical guidance to transform urban vulnerabilities into opportunities. Through aligning ecological imperatives with social equity, the book informs strategies for creating urban systems that are resilient, inclusive, and culturally responsive.