This study examines the existence of Islamic law, the forms and mechanisms of its influence on the formation of Indonesian national law, and its position within the Pancasila-based rule of law and Indonesian legal pluralism. This normative legal research employs statutory, conceptual, historical, and legal-political approaches. Legal materials are qualitatively analyzed through legal interpretation, systematization, conceptual comparison, and legal argumentation. The findings demonstrate that Islamic law has a multilayered existence as a religious norm, living law, a material source of law, and, after undergoing legally recognized processes, part of positive national law. Its application in family law, Religious Courts, waqf, zakat, Islamic economics, halal product assurance, and Aceh's special autonomy reveals a selective, multi-path, multi-actor, multilevel, adaptive, and cyclical transformation. This study develops a Selective Transformation Model of Islamic Law, encompassing substantive, normative-formal, institutional, administrative-regulatory, adjudicative-constitutional, and territorial transformations through substantive, procedural, and constitutional legitimacy. Pancasila and the 1945 Constitution function as the constitutional integrative framework governing such transformation within Indonesia's plural legal system.
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