El-Hadji Malick Sy (Fula: Allaaji Maalik Si, 1853–1922) was a Senegalese religious leader and teacher in the Tijaniyya Sufi Malikite and Ash'arite brotherhood.
He traveled to Mecca, then returned to teach at Louga and Pire [fr] before establishing a zāwiya (religious center) at Tivaouane he settled permanently in 1898 in Tivaouane in 1902 following guidance received from his father in law Mor Massamba Diery Dieng father of his wife Sokhna Yacine Dieng and at the invitation of local leader Djibril Guèye, which became a center for Islamic education and culture under his leadership.
In Senegal's Wolof country, especially the northern regions of Kajoor and Jolof, the Tijānī Order was spread primarily by El-Hajj Malick Sy.
The Gàmmu (Mawlid in Arabic, the celebration of the birth of Muḥammad) of Tivaouane gathers many followers each year.
Malick is also the author of many poems and books about Islam, Muhammad, and At-Tijani: