The Islamization of the Sudan region (Sahel) encompasses a prolonged period of religious conversion, through military conquest and trade relations, spanning the 8th to 16th centuries. The aftermath of religious incursion and sectarian conflict remains a source of ongoing tension throughout the Sahel states.
Following the 7th century Muslim conquest of Egypt and the 8th-century Muslim conquest of North Africa, Arab Muslims began leading trade expeditions into Sub-Saharan Africa, first towards Nubia, and later across the Sahara into West Africa. Much of this contact was motivated by interest in trans-Saharan trade, particularly the slave trade.
The proliferation of Islamic influence was largely a gradual process. The Christian kingdoms of Nubia were the first to experience Arab incursion starting in the 7th century. They held out through the Middle Ages until the Kingdom of Makuria and Old Dongola both collapsed in the early 14th century. Sufi orders played a significant role in the spread of Islam from the 9th to 14th centuries, and they proselytized across trade routes between North Africa and the sub-Saharan kingdoms of Ghana and Mali. They were also responsible for setting up zawiyas on the shores of the River Niger.