Abstract: Customary criminal law is the living law regulates actions that violate the feeling of justice and propriety that lives in the community, causing disruption of peace and balance of society. To restore peace and balance, a customary reaction occurs. In maintaining customary criminal law, where each problem can be resolved completely, against every problem that exists and that may exist, because customary criminal law prioritizes the achievement of togetherness goals. In an effort to settle criminal cases it is time to pay attention to the mechanism of settlement through customary criminal law, so that it is necessary to study the existence of Dayak customary criminal law in Central Kalimantan Province. Based on the results of the study it was found that in Central Kalimantan Province the original inhabitants of the Dayak tribe continued to apply and adhere to the application of customary criminal law in an effort to maintain the form and characteristics of local wisdom originating from the Dayak community and cultural traditions. Customary law is not entirely an unwritten law, because there are also written elements in the Dayak community in Dayak customary law. Index Terms: Existence, Customary Penal Code, Dayak