<p><em>The qualitative research employed by the author examines the acculturation of Islamic communication values in Riau Malay marriage customs, observing events at various stages of the marriage process. Data is gathered through the Riau Malay Customary Institute (LAM Riau), using interviews and documentation and observing traditional marriage ceremonies. Additional data is collected from Riau community leaders involved in the marriage process. The research spans approximately 16 months. Findings indicate that Riau Malay traditional weddings are meticulously organized to affirm Malay identity and fulfill societal roles, with customs regulating life aspects at the national and state levels. Islamic communication strengthens individual religious identity. Secondly, values in Islamic communication, guided by the Quran and Hadith, are integral to traditional Malay wedding ceremonies, encompassing pre-wedding, marriage process, and post-wedding stages. Thirdly, the acculturation of Islam in Malay marriage customs dates back to the 15th century, marked by trade, intermarriages between Arab traders and locals, and the Islamization of Malay rulers, based on the Quran and As-Sunnah, the primary sources of Islamic teachings.</em></p>