BiodiverCities is a project in the context of the EU Biodiversity Strategy. It aims to enhance civil society participation in local and urban decision-making, leading to building a joint vision of the green city of tomorrow shared among civil society, scientists and policymakers. The project will collect practical examples of how to engage citizens in vision building around urban nature, monitoring, and solutions to improve urban biodiversity. It will also assess how urban green infrastructure can be used to provide local benefits for people and nature and how can it contribute to enhancing regional biodiversity. BiodiverCities is funded by a grant of the European Parliament. It is implemented by the Joint Research Centre and DG Environment. Our ambition is to deliver a roadmap to enhance the biodiversity and green infrastructure of European cities by 2030.