This paper examines the concept of urban clusters and explores its application in South Asia. Drawing lessons from international case studies, it highlights the advantages of clustered urbanization. It identifies developments around core cities Delhi, Dhaka, and Mumbai as mature clusters; and Ahmedabad, Bengaluru, Chennai, Colombo, Kathmandu, and Pune as emerging clusters. This paper discusses evolving development priorities for these core cities with regard to economic development, urban infrastructure and services, governance and citizen engagement, finance, and environmental protection and resilience. It also explores strategies for financing cluster development. Planned development of these clusters has the potential to drive regional economic growth.