The chapter explores the circular city model as a conceptual framework for promoting sustainable urban development (SUD) through resource efficiency, closed-loop systems, and regenerative practices. It provides a theoretical foundation based on systems thinking, urban metabolism, and industrial symbiosis, highlighting how these principles can be adapted to municipalities, cities from the West Development Region of Romania. The literature-based discussions emphasize the role of governance, innovation ecosystems, and stakeholder collaboration in transitioning toward circularity. To complement the conceptual framework design and the theoretical analysis, the chapter includes an empirical component, which details the results of a survey conducted among key stakeholders (public servants, project managers and other stakeholders’ representatives) in the West Region of Romania. The survey aimed to assess awareness, readiness, and perceived challenges related to implementing circular city principles. Findings reveal varying levels of understanding and commitment across public authorities, businesses, and civil society, as well as opportunities for capacity building and policy alignment. These insights provide a practical perspective on the feasibility of circular strategies and inform recommendations for regional development.