World Cities Day is observed annually on 31 October, marking the conclusion of Urban October. First celebrated in 2014, the day features a global observance hosted by a different city each year and focuses on a specific theme.

The Global Observance of World Cities Day 2025 will highlight the role of people-centred smart cities. It will explore how data-driven decision-making, technology and artificial intelligence can enhance urban living and support recovery from current shocks and crises. The event will also promote smart city approaches that prioritise human well-being and inclusivity.