This study aims to conceptually analyze the relationship between religious moderation, multicultural education, and strengthening social harmony in the perspective of Islamic education. The research is motivated by the increasing challenges of intolerance, radicalism, and social polarization in pluralistic societies that demand that Islamic education play a more strategic role in building a culture of peace and inclusion. The research uses a qualitative approach with the type of library research through the analysis of various academic literature related to the concepts of wasatiyyah, tasamuh, multicultural education, inclusive education, and social harmony. The data collection technique was carried out through a documentation study of scientific journals, books, and relevant research results, then analyzed using content analysis with a descriptive-critical approach. The results of the study show that religious moderation based on the values of wasatiyyah and tasamuh has a significant contribution in building tolerant, inclusive, and humanist Islamic education. Multicultural Islamic education has been proven to be able to strengthen social cohesion, prevent radicalism, and build a culture of peace through the integration of the values of pluralism, dialogue, and respect for diversity in the curriculum and culture of educational institutions. In addition, inclusive education and moderate education leadership play an important role in creating a harmonious educational environment in a multicultural society. This research emphasizes that Islamic education based on religious moderation is an effective strategy in strengthening social harmony and maintaining social stability in the global and digital era.