The function of the law is to regulate, limit, and supervise human behavior, including the implementation of local government in the implementation of regional autonomy. As stated by John Austin in Soerjono Soekanto, humans often act outside the legal scheme because they are influenced by experience and tradition, so a strong legal instrument is needed to maintain regional autonomy according to its goals. Since the enactment of Law Number 23 of 2014, the relationship between the central and regional governments has changed significantly, placing local governments as the implementers of autonomy as well as parties who are obliged to account for their authority to the central government. This study examines the role of law in the supervision of regional autonomy and the effectiveness of legal supervision mechanisms in preventing abuse of authority. The results of the study show that although regulations and monitoring instruments such as the DPRD, internal audit, and policy evaluation are available, their implementation is still weak due to political intervention, limited apparatus capacity, and overlapping authority. Empirical studies also affirm the importance of professional internal controls, transparency, and integrity of the apparatus to ensure effective supervision. In conclusion, legal supervision of regional autonomy needs to be strengthened regulatively, structurally, and culturally. Strengthening bureaucratic capacity, apparatus professionalism, and governance reform are the keys so that regional autonomy can be implemented accountably and support national development goals.