T This research examines the authority of the public prosecutor in the criminal investigation process of murder cases in indonesia and south korea. the research problem focuses on how the regulation and implementation of the public prosecutor’s authority in the investigation of murder cases are arranged and applied in indonesia and south korea. the research method employed is normative legal research using a comparative law approach, with a descriptive-analytical nature, deductive reasoning, and supported by secondary data consisting of primary, secondary, and tertiary legal materials. the conclusion of this research indicates that the authority of the public prosecutor in the investigation of murder cases in south korea is broader, as prosecutors may be involved from the early stages of the investigation, making the case-handling process more effective and directed. however, such broad authority potentially leads to excessive concentration of power and the risk of abuse of authority. meanwhile, the authority of the public prosecutor in indonesia is limited to the pre-prosecution stage as regulated in the criminal procedure code, reflecting a separation of powers and stronger oversight mechanisms; however, this limitation may reduce the effectiveness of case handling due to the restricted involvement of the public prosecutor at the early stage of investigation.