The topic of pinpointing Nature-Based Solutions (NBS) in the urban context has been cultivating interest lately from different scholars, urban planning practitioners and policymakers. This Special Issue originates from the Greening Cities Shaping Cities Symposium held at the Politecnico di Milano (12-13 October 2020), aiming at bridging the gap between the science and practice of implementing NBS in the built environment, as well as highlighting the importance of citizen participation in shared governance and policy making. The Special Issue received contributions from all over the world, from Italy, Germany, the Netherlands, Turkey, Brazil, Portugal, Denmark, France, Bulgaria, Sweden, Hungary, Spain, the UAE, the UK, and the USA.