The phenomenon of autocratic legalism has permeated democratic institutions in Indonesia. This is marked by the executive, legislative, and judicial power holders using the people's trust to achieve goals that contradict constitutionalism, acting covertly and hiding behind the law. The institutions weakened include the Corruption Eradication Commission (KPK), the Constitutional Court (MK), and the House of Representatives (DPR). This study aims to understand how the phenomenon of autocratic legalism occurs in these three institutions and what steps should be taken to prevent and address this phenomenon. The research method used is normative legal research. The results of this study indicate that autocratic legalism refers to the actions of individuals who use the law to legitimize their power. This is evident in several policies issued by the three institutions in Indonesia. This phenomenon of autocratic legalism can actually be resolved through institutional action and addressed with legal and ethical enforcement, and its prevention through improved oversight systems, recruitment, and legal education.