This study examines the challenges of applying Islamic law in Indonesia’s indigenous communities, which operate within a pluralistic legal system comprising customary law, Islamic law, and national law systems that often overlap in practice. The objective of this study is to analyze the dynamics of the relationship among these three legal systems and to identify the forms of conflict that arise in their application within these communities. The research method used is qualitative with a library research approach through the analysis of various scientific journals and relevant literature. The research findings indicate that legal overlap occurs in various aspects of life, particularly in cases of inheritance, customary marriage, and customary land tenure, where some communities still uphold traditional legal systems that differ from the provisions of Islamic law or national law, such as the patriarchal inheritance system in certain regions. This situation often leads to discrepancies in the application of the law and the potential for social conflict within society. Therefore, harmonization between customary law, Islamic law, and national law is necessary to foster justice, legal certainty, and social order within Indonesia’s diverse society.
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