The theme for 2025, “Healthy soils for healthy cities”, focuses on the role of soils in cities and the challenges posed by soil sealing and urbanization. Urban soils provide essential ecosystem services: they support food production, filter water, store carbon, regulate temperatures, and sustain biodiversity. World Soil Day 2025 is a call to action. It invites policymakers, scientists, city leaders, civil society, and citizens everywhere to reimagine urban spaces through their soils, ensuring that people and nature can thrive together in healthy green cities.