Planning for Circular Cities explores how circular economy principles can be effectively integrated into urban planning and policymaking to address the pressing challenges cities face today, such as resource scarcity and climate change. The book analyses international and European policy frameworks, examines pioneering case studies such as Amsterdam and Prato, and highlights the strategic role of cities and the spatial planning discipline in advancing circular transitions. Building on literature reviews and empirical insights, it proposes an innovative methodological framework that embeds circularity into spatial planning through Strategic Environmental Assessment. The volume provides guiding principles, objectives, and indicators to support policymakers and planners in designing resilient, resource-efficient, and regenerative urban systems.