Cities and regional governments are making critical contributions to sustainability and climate change, and are key sites of achieving the aims of the Convention on Biodiversity and the Green New Deal. This study demonstrates the economic value of nature-based solutions throughout Europe, in order to raise awareness among decision-makers and practitioners about their value, and to demonstrate the potential of urban actions. This briefing note presents the results of value calculations, examples of select nature-based solutions and their economic and social value, methods and data sources, and conclusions.