This chapter explores urban nature-based solutions (NBSs) as an essential strategy for creating circular and liveable cities. NBSs leverage natural processes and ecosystems to address various urban challenges, including climate change adaptation, biodiversity loss, water management, and urban resilience. The chapter highlights how NBS can transform cities into more sustainable, resource-efficient environments while offering social, economic, and environmental benefits. Key urban NBSs discussed include green roofs, green walls, community gardens, permeable pavements, bioswales, urban forests, and constructed wetlands. These solutions not only contribute to mitigating the effects of urbanisation but also improve air and water quality, reduce the urban heat island effect, and enhance biodiversity. By integrating nature into urban planning, cities can become more resilient to extreme weather events and better equipped to manage natural resources sustainably. The chapter further emphasises the importance of policy frameworks and financial incentives to encourage the widespread adoption of NBS. Case studies from global cities illustrate the successful implementation of NBS and their positive impact on urban liveability. Ultimately, NBSs are a powerful tool in the circular economy framework, fostering healthier, greener, and more liveable cities that support both people and the planet.