Terrorism poses a threat to national security with multidimensional impacts, affecting not only security aspects but also social, economic, and political stability, as well as governance. The complexity of this issue necessitates an approach involving various stakeholders through a collaborative governance mechanism. This study aims to analyze the collaboration among local governments, security forces, and the community in terrorism prevention efforts, and to identify the factors that facilitate or hinder the effectiveness of such collaboration. A qualitative approach with a case study design was employed. Data were gathered through in-depth interviews, observations, and document analysis involving local government officials, security personnel, community and religious leaders, and representatives of civil society organizations participating in terrorism prevention programs. Data analysis utilized the interactive model developed by Miles, Huberman, and SaldaƱa, comprising data condensation, data display, and conclusion drawing. The analytical framework is grounded in collaborative governance theory, emphasizing dimensions such as face-to-face dialogue, trust-building, commitment to the process, shared understanding, and intermediate outcomes. The findings indicate that stakeholder collaboration has been implemented through cross-sector coordination, information exchange, public education initiatives, the fostering of national consciousness, and early detection of potential radicalization. Local governments act as policy facilitators and program coordinators; security forces carry out prevention, surveillance, and guidance functions; and the community plays an active role in maintaining local vigilance and reporting potential threats. However, the effectiveness of this collaboration faces several obstacles, including suboptimal inter-agency coordination, resource limitations, low public participation in some segments, and the lack of a fully integrated information-sharing system. The study concludes that the application of collaborative governance can strengthen terrorism prevention efforts if supported by collaborative leadership, intensive communication, clear role allocation, institutional capacity building, and sustained community participation. Therefore, it is necessary to strengthen cross-sector coordination forums, enhance public awareness regarding the dangers of radicalism, and formulate more adaptive local policies to support an effective and sustainable terrorism prevention system.