This guidance document responds to exisiting gaps and highlights a range of policy and supporting instruments relevant for NBS design, implementation and maintenance. Policy instruments include regulations, strategies, programmes, action plans and financial incentives. The guidance aims to support policymakers, city officials and local citizens and initiatives in the design and implementation of such policy instruments for increased NBS implementation. Each instrument is briefly described, including how it works and what benefits it can deliver. Case studies from Germany and Europe showcasing how different cities approach NBS and foster their integration into their policy frameworks illustrate each of the instruments.