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This papers demonstrate a novel application of the Multi-Criteria Decision Analysis (MCDA) to the practical challenge of selecting a set of NbS to address multiple urban challenges. The MCDA tool was used in seven cities participating in the European Union project ‘Urban GreenUP’. Authors find that participating cities are seeking to balance a large number of possible benefits from NbS solutions, and the tool proved useful for navigating the selection decision. Users identified opportunities to improve the tool’s usability and clarity. They also noted a key strength of the tool as a prompt for co-production of knowledge and decisions. Collectively, these findings advance the design and application of tools to support complex decisions about selecting NbS to address diverse urban challenges.