On November 25–26, at the Asia Smart City Conference (ASCC) 2025 in Yokohama, the establishment of the Asian Circular Cities Declaration was announced. The Circular Cities Declaration is a framework launched in Europe in 2020, with about 90 European cities participating to date. Signatory cities promote ten commitments set out in the declaration, such as establishing goals and strategies for their local circular transition and sharing practices through the declaration’s network to enhance each city’s circular policies. Until now, no comparable region-wide declaration framework has existed in Asia.