Abd al-Rauf ibn Ali al-Fansuri al-Sinkili (spelling variation Abdurrauf Singkil, 1615–1693 CE) was a well-known Islamic scholar, spiritual leader of the Shattariyya tariqa and the mufti of Aceh Sultanate. He was the confidant of Sultana Safiyat al-Din. He was considered the first person to spread the Shattari Sufi order in Indonesia and Southeast Asia. Many of his students also became disseminators of Islam. He is commonly known as Shaikh Abdurrauf As-Singkili, and also known as Teungku Syiah Kuala, which translates to "Sheikh in the Estuary".