<![CDATA[The development of economic activities in Indonesia not only requires certainty and efficiency, but must also be directed toward the creation of fair economic relationships that benefit society. This need has a constitutional basis in Article 33 of the 1945 Constitution, which establishes solidarity, economic democracy, efficiency with justice, sustainability, and the people’s prosperity as integral components of the direction for managing the national economy. In this context, the principles of muamalah are relevant for examination because they embody the values of justice, public welfare, balance, voluntary consent, trustworthiness, and the prohibition of harmful business practices. This study aims to analyze how the principles of muamalah can be harmonized with constitutional economic values in order to strengthen the national economic and business law systems. This study employs a normative legal research method using both the statutory approach and the conceptual approach. The legal materials used consist of primary sources namely the 1945 Constitution and laws and regulations related to business law and Islamic economics as well as secondary sources such as books, journals, and research findings. The legal materials were collected through a literature review and analyzed using a qualitative-prescriptive approach by aligning the principles of muamalah with the values contained in Article 33 of the 1945 Constitution. The results show indicate that there is a strong convergence between the principles of muamalah and constitutional economics, particularly in terms of justice, solidarity, the public interest, balance, and the protection of the vulnerable. Harmonization of the two can be achieved by reinforcing these values in the formulation and implementation of national economic law. This harmonization is not intended to transform the national legal system into a sharia legal system, but rather to enrich economic law with universal values that are in line with Pancasila and the 1945 Constitution. Thus, the principles of muamalah can serve as a source of values in building a national economic system that is more just, inclusive, and oriented toward the prosperity of society]]>
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