The integration between Islamic values and Malay customs represents a distinctive characteristic of the social and cultural life of the Malay community that has evolved historically and continuously. Islam is not merely understood as a belief system but also as a source of values shaping customary structures, social norms, and community behavior. This study aims to examine the forms of integration of Islamic values within Malay customs and their role in constructing cultural identity and social order. The article employs a qualitative approach using library research methods, applying descriptive analysis to classical and contemporary literature, including works of Malay scholars, customary manuscripts, and relevant previous studies. The findings reveal that the integration of Islamic values and Malay customs is reflected in the principle “adat bersendi syarak, syarak bersendi Kitabullah,” which serves as the fundamental foundation of Malay social life. Islamic values such as justice, deliberation, politeness, trustworthiness, and social responsibility are internalized in various aspects of customary practices, including family life, leadership systems, and conflict resolution mechanisms. This integration occurs harmoniously and complementarily, ensuring that Malay customs remain aligned with Islamic teachings. The study concludes that the integration of Islamic values and Malay customs plays a significant role in maintaining social harmony, strengthening cultural identity, and serving as a model for the synergy between religion and local culture in multicultural societies