This chapter explores the intersection of smart city concepts and overtourism, highlighting how urban innovations can support sustainable tourism in cities facing challenges from rising urban populations and global tourism. It discusses how smart cities, through technologies like IoT, big data, and AI, can address overtourism by implementing smart infrastructure, real-time monitoring, and AI-driven decision-making to manage tourist flows, improve visitor experiences, and reduce environmental and social impacts. The roles of stakeholders such as governments, businesses, and local communities in these efforts are also examined. Additionally, the chapter looks at future trends, including the adoption of new technologies and climate resilience, while addressing ethical issues like privacy and the digital divide. It concludes with policy recommendations for urban planners, emphasizing the need to align smart city development with sustainable tourism goals for balanced and resilient urban environments.