This study analyzes the constitutional status of Islamic law and its substantial contribution to the development of Indonesian national law. The primary issue concerns the dynamics of integrating Sharia values into the Pancasila rule-of-law framework, which frequently encounters challenges in regulatory harmonization. This research employs normative legal analysis, utilizing legislative, conceptual, and case-based approaches. The findings demonstrate that Islamic law has strong legal foundation under Articles 24 and 29 of the 1945 Constitution of the Republic of Indonesia and contributes significantly by transforming norms into national legislation, such as Sharia economic law and halal product certification. In summary, Islamic law constitutes an organic element that reinforces the national legal system. The implications of this research highlight the need to elevate the legal status of Sharia instruments to the level of law to ensure legal certainty. These findings advance the theory of religious constitutionalism in the context of Indonesia's legal development.
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