The 2026 International Conference on Sustainable Development and Urban Planning (SDUP 2026) will be held from April 10-12, 2026, in Qingdao, China. The conference will bring together leading scholars, urban planners, and industry experts from around the world to focus on the latest theories, innovative practices, and future trends in sustainable development, aiming to promote interdisciplinary exchange and collaboration in the field of urban planning. As global urbanization accelerates, addressing environmental protection, resource conservation, and social equity in urban design and management has become a critical challenge faced by countries worldwide. SDUP 2026 will delve into core topics such as green infrastructure, smart city technologies, climate adaptation strategies, socially inclusive planning, and policy evaluation, with the goal of sharing innovative achievements, exchanging cutting-edge experiences, and fostering effective integration of theory and practice.