This chapter explores the integration of GIScience in coastal policy-making, focusing on its role in managing coastal socio-ecological systems. It emphasizes the importance of policy in coastal management and how GIScience tools, such as mapping, spatial analysis, data integration, and predictive modelling, enhance decision-making processes. GIScience facilitates multi-disciplinary analyses, offering a comprehensive approach to understanding and addressing the complexities of coastal systems. The chapter highlights real-world examples of GIScience integration, demonstrating the benefits of spatial data for sustainable resource management. It also addresses the challenges of GIScience integration, such as data availability, technical limitations, and stakeholder capacity, while recognizing these challenges as opportunities for innovation and collaboration. Looking ahead, the future of GIScience in coastal policy is promising, with advancements in remote sensing, artificial intelligence, and mobile technology providing new avenues for policy development. The increasing importance of participatory GIS (PGIS) underscores the value of community engagement in policymaking. By incorporating local knowledge, PGIS promotes inclusive, adaptive, and effective coastal management strategies. In summary, the chapter integrating GIScience into coastal policy is crucial for developing resilient, sustainable solutions to the challenges facing coastal regions worldwide.