Objective: After the enactment of Law No. 21 of 2011 concerning the Financial Services Authority (OJK), the supervision and regulation of Indonesia's financial sector, including Islamic banking, was transferred to the OJK. Nevertheless, Islamic banking operations must adhere to sharia principles, supervised by the National Sharia Council (DSN) of the Indonesian Ulema Council. This study explores the division of authority between the OJK and DSN in regulating Islamic banks, focusing on their conformity with sharia principles as outlined in Law No. 21 of 2008 concerning Sharia Banking. Theoretical Framework: Theoretically, this research is grounded in the duality of regulatory oversight—secular and religious—emphasizing the coexistence of financial system integrity and sharia compliance. Employing a juridical-normative method, the study analyzes statutory laws, DSN fatwas, and their application within the regulatory framework. Method: This study uses a juridical-normative approach to analyze the relationship between the Financial Services Authority (OJK) and the National Sharia Council (DSN) in the regulation and supervision of Islamic banking. This approach focuses on normative studies of relevant laws and regulations, such as Law No. 21 of 2011 concerning the Financial Services Authority, Law No. 21 of 2008 concerning Sharia Banking, as well as fatwas issued by DSN. Results and Discussion: The Result and disccusion reveal that while the OJK holds comprehensive regulatory and supervisory authority, DSN retains pivotal control as the interpreter and guarantor of sharia compliance. This dual authority reflects a nuanced balance between maintaining financial system stability and ensuring adherence to Islamic legal principles. Research Implications: The implications of this research underscore the importance of clear, collaborative mechanisms between the OJK and DSN to avoid regulatory overlaps or inconsistencies. Furthermore, this study emphasizes the unique dual-regulatory model as a hallmark of Indonesia's Islamic banking system, contributing to the discourse on harmonizing secular and religious financial governance. Originality/Value: T The originality of this research lies in its juridical-normative approach to analyzing the interplay between OJK's supervisory role and DSN's authority, offering insights into optimizing regulatory practices in Islamic banking.
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