Background/purpose: Religious moderation at the high school level is an essential part of the curriculum. One of the supporting factors in education is the principal's leadership style. The aim of this research is to explore the strategy and implementation of the principal's leadership in promoting religious moderation. Materials/methods: This research employs a qualitative method with a phenomenological approach. The data sources for this study include school principals, teachers, and students from public Islamic high schools. Data collection instruments consist of interviews and observations, using structured interview guides and data recording tools such as tape recorders and video recordings, along with other research support tools. The technical data analysis involves data coding procedures and presenting the research findings through written narratives, interviews, documents, and other field materials. Results/Conclusion: The results of the study are summarized in five key points. First, schools in MAN emphasize the value of religious moderation in subjects such as Civic Education (PKN) and Islamic Religious Education. Second, the school has established a spiritual moderation team, which has undergone government-led education and training. After the training (DIKLAT), the team became a pioneer in implementing religious moderation, starting with teachers and extending to students. Third, the school evaluates the implementation of religious moderation by requiring each teacher to submit a report during supervision by the school principal. Fourth, the school organizes student taklim assemblies, moving from house to house, to better understand each family. Fifth, the impact of this initiative includes fostering a strong sense of self-confidence among students.