This research elaborates on the implementation of traditional marriage customs among the Muslim community of the Pakpak tribe in Dairi district, including its forms, causes, and the impact of influence, along with an analysis of the integration between Islamic law and customary law in the marriage process of the Pakpak Dairi Muslim community. The type of research used in this dissertation is juridical empirical research, employing data collection techniques from field studies and literature. The data collection tools include document studies, interviews, and observations. Subsequently, the data is processed and analyzed descriptively using various theories as analytical tools, such as the 'urf (customary law), Maslahah (public interest), Receptio Exit and Recptio a Contrario, and Legal Awareness. First, the implementation of traditional marriage customs among the Muslim community of the Pakpak tribe in Dairi district is divided into five stages. Preparation stage, which includes; Mangririt/mengindangi, Simerberum, Mersiberren Tanda Burju, Menglolo/mengkata utang and Muat nakan, and tangis berru sijahe. Second, the integration of Islamic law and customary law in the marriage customs of the Pakpak Dairi Muslim community can be seen from three perspectives. 1) Form of integration, which includes the following elements; Determining the wedding day and date using the Islamic calendar, Conducting the khataman Alquran before the marriage contract, Reciting verses from the Holy Quran during the marriage ceremony, Offering a lightweight dowry, Providing words of advice,Reciting solawat syaroful Anam such as barjanzi and Marhaba and Reciting additional prayers. 2) Causes of integration, such as the emergence of new ideas considered better, strong religious beliefs, fanaticism, and a willingness to learn about religion. 3) Impact of integration, including the following aspects; the emergence of legal awareness among the community, religious and customary leaders gaining equal authority and credibility and the development of religious understanding and the adoption of religious attitudes among the community.