This chapter focuses on dynamic water resource management for regenerative cities, emphasising the need for a more sustainable, circular approach to urban water management. As cities face increasing water scarcity, compounded by rapid urbanisation and climate change, traditional methods of water supply are no longer sufficient. The chapter advocates for a transition from linear water management systems towards more integrated and regenerative models. It introduces key concepts such as cities acting as water supply catchments, where urban areas manage and recycle their own water through innovative technologies like rainwater harvesting, greywater reuse, and advanced wastewater treatment. The chapter highlights global best practices, including Tokyo’s water-saving initiatives, Singapore’s closed water loop system, and China’s Sponge City programme, illustrating how cities can adopt diverse, multifunctional water strategies to secure their long-term water supply. Additionally, the chapter underscores the importance of blue–green infrastructure, which integrates natural and built systems to provide ecosystem services, mitigate flooding, and enhance urban resilience. By integrating dynamic water resource management with urban planning, cities can reduce their environmental footprint and foster sustainable development, making water security a central component of regenerative city planning.