Constructed wetlands (CWs) provide a new and natural approach to treating wastewater, being both affordable, energy-saving, and friendly to the environment when compared to most other systems. As we move toward regenerative and circular growth, including constructed wetlands in the biocircular economy (BCE) can allow us to reach our sustainability goals. This chapter discusses how constructed wetlands help achieve the BCE by processing water, removing nutrients, producing biomass, capturing carbon, and assisting in restoring the ecosystem. This chapter, viewed through multiple perspectives, examines how constructed wetlands link with circularity’s main ideas and serve the bioeconomy by relying on renewable biological inputs. It reveals several examples of cities and towns successfully using CWs to close waste and nutrient cycles. Also, according to this chapter, important hurdles for full implementation involve issues such as incorrect technology, low support from rules, money problems, and a lack of well-informed citizens. This chapter describes examples of new wetland setups, effective wastewater processing tools, and technological advances aimed at improving the management of more waste. Policymakers should consider working together with stakeholders to include constructed wetlands (CWs) in national plans on circular economics. The idea behind this chapter is to emphasize the role of CWs for those who want to build sustainable and “green” infrastructures.