This research is motivated by the widespread formation of Regional Regulations and Regional Head Regulations without harmonization by the Regional Offices of the Ministry of Law (Kanwil Kemenkum). Such practices risk creating legal disharmony, overlapping regulations, and violations of the hierarchy of laws as stipulated in Law No. 12 of 2011 on the Formation of Legislation and its amendments. The study aims to analyze the legal status of unharmonized regional regulations, the juridical implications of neglecting harmonization, and the institutional role of the Ministry’s Regional Office in preventing regulatory conflicts. A normative juridical approach was employed, combining statutory, conceptual, and case analyses based on primary and secondary legal materials as well as audit findings from the Ministry’s Inspectorate General (2024–2025). The research confirms that Regional Regulations (Perda) and Regional Head Regulations (Perkada) that have not undergone the harmonization phase retain administrative validity, but contain formal legal flaws. This not only increases the vulnerability to vertical norm conflicts but also degrades the quality of legislation at the regional level. Therefore, the harmonization process is a crucial instrument in protecting the integrity of the national legal system while ensuring coherent synchronization between central and regional policies.
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