T There are issues concerning the regulation of the presidential election system in the republic of indonesia and the republic of korea, because although both countries operate under the same legal system, namely civil law, and both adopt a presidential form of government, their regulatory frameworks differ significantly. this study aims to examine the regulatory arrangements of presidential elections in both countries and to identify their respective strengths and weaknesses. the research employs a normative juridical method with a descriptive approach, using secondary data consisting of primary legal materials, secondary legal materials, and tertiary legal materials, with conclusions drawn through deductive reasoning. the findings show that the presidential election systems of indonesia and south korea differ fundamentally in terms of legal foundations, institutional arrangements, nomination mechanisms, electoral systems, and terms of office. indonesia applies a presidential threshold, a two-round electoral system, and a two-term limit to ensure majority legitimacy and governmental stability. in contrast, south korea adopts a zero-threshold policy, a single-round election system, and a single five-year term based on a strong constitutional framework to prevent the concentration of power. these differences indicate that indonesia emphasizes electoral legitimacy and accountability, while south korea prioritizes electoral efficiency, institutional independence, and the prevention of authoritarianism.