The rise of smart cities, integrating technology into urban infrastructure, has revolutionized urban management, enhancing efficiency and citizen services. However, this increased connectivity also exposes cities to significant cybersecurity threats. This paper presents a case study-based approach to developing robust cybersecurity policies for smart cities, focusing on identifying vulnerabilities and mitigating risks associated with IoT devices, cloud platforms, and data networks. By examining case studies from various smart cities globally, this research outlines the key challenges cities face, including data breaches, unauthorized access, and cyberattacks. It also explores best practices, such as encryption, multi-factor authentication, and continuous monitoring, to secure critical infrastructure and citizen data. Furthermore, the study emphasizes the importance of collaboration between public and private sectors, along with a need for dynamic policy frameworks that evolve with technological advancements. This approach provides insights into creating adaptable, resilient cybersecurity strategies tailored to the unique needs of smart cities, ultimately promoting safer and more secure urban environments in the face of growing cyber threats.