This study examines the settlement of land disputes in Nagari Koto Nan Gadang by the Customary Peace Judges Council, focusing on Decision No. 03/DHPA/KAN-KNG/VI/2021. It aims to analyze the dispute resolution process from the perspective of Minangkabau customary law and Islamic justice values, as well as its conformity with the principles of Fiqh Siyasah Dusturiyah. This study employs a descriptive-analytical qualitative method using field research and literature review. Data were collected through observations, interviews, and documentation, supported by relevant legal literature and customary regulations. The findings indicate that land dispute resolution involves several stages, beginning with the submission of a complaint, followed by mediation through the Jonjang Naiak Batanggo Turun mechanism, trial proceedings, site inspection, and deliberation among the panel of customary judges before reaching a decision. Throughout these stages, local wisdom plays a significant role in maintaining fairness, transparency, and social harmony. The principles of Gabuak Diampe, which emphasizes deliberation and collective agreement; Miang Dikikih, which highlights the importance of objective evidence and careful examination; and Puntuang Diombuh, which encourages the acceptance of decisions with an open heart, serve as essential foundations for resolving disputes. Furthermore, the decision reflects the principles of Fiqh Siyasah Dusturiyah, particularly justice (al-‘adl), deliberation (al-musyawarah), and public welfare (al-maslahah). These findings demonstrate that customary dispute resolution in Nagari Koto Nan Gadang represents a meaningful integration of local legal traditions and Islamic values. This integration contributes to the legitimacy of customary institutions and supports peaceful, equitable, and socially sustainable land dispute resolution.