The integration of Artificial Intelligence (AI) in urban environments offers transformative opportunities to enhance sustainability, resilience, and quality of life. This chapter provides a comprehensive examination of how AI technologies are revolutionizing urban planning, services, and infrastructure across diverse global contexts. Through rigorous analysis of empirical evidence and case studies from both developed and developing economies, we explore AI applications in energy management, transportation optimization, waste reduction, and climate resilience. The chapter also addresses critical ethical considerations, implementation challenges, and governance frameworks necessary for human-centered, sustainable urban AI deployment. By identifying key success factors and offering strategic recommendations, we provide actionable insights for policymakers, urban planners, and stakeholders seeking to leverage AI for more sustainable cities.