This chapter examines the circular economy as a pathway to building more resilient and sustainable cities. As urban areas expand, they face growing environmental pressures, such as increased waste, rising emissions, and resource depletion. The circular economy responds to these issues by replacing the traditional linear model of ‘take–make–dispose’ with approaches that prioritise resource efficiency, waste reduction, and regeneration. The chapter emphasises the link between circular practices and urban resilience – defined as a city’s capacity to recover from shocks like climate change, disasters, and economic disruptions. Through strategies such as recycling, reuse, and the integration of nature-based solutions, cities can strengthen infrastructure and sustainability. Key urban sectors including waste, water, and the built environment are explored to show how circular strategies are being applied globally. Despite the promise, the chapter acknowledges several challenges, including regulatory and financial barriers, as well as the need for cultural transformation. However, it also highlights opportunities in policy innovation, public–private collaboration, policy innovation, and technology. The chapter concludes that the circular economy is vital for enabling cities to adapt, endure, and prosper in a world of accelerating change.