The Global Observance of World Cities Day, under the theme Financing sustainable urban future for all, will be held in the Municipality of Üsküdar in Istanbul, Türkiye on 31 October 2023.

World Cities Day takes place on 31 October each year and aims to promote the international community's interest in global urbanization, push forward cooperation among countries in meeting opportunities and addressing challenges of urbanization, and contributing to sustainable urban development around the world.