Elaborating increasing penchant for smart cities, this chapter takes into account linkages between urbanization and sustainable development to evaluate the concept of sustainable urban development along with brief appraisal of prevalent notions of cities like livable cities, eco-cities and their related components that make city life worth living. Thereafter, the study proceeds to examine prospects of sustainable smart cities, with specific focus on its constituents like smart mobility, smart economy, smart living, smart people, smart governance and smart environment. While assessing options available for cities to tackle the vagaries of climate change, the chapter seeks to present a case for ecosystem-based adaptation as a cost-effective, viable and durable option to deal with adverse impacts of climate change. Lastly, it suggests the implementation of New Urban Agenda of the UN-Habitat in tandem with sustainable development goal-11 as a way out.