The Atlantic slave trade or transatlantic slave trade involved the transportation by slave traders of enslaved African people, mainly to the Americas. The outfitted European slave ships of the slave trade regularly used the triangular trade route and its Middle Passage, and existed from the 16th to the 19th centuries. The vast majority of those who were transported in the transatlantic slave trade were from Central and West Africa who had been sold by West African slave traders to European slave traders, while others had been captured directly by the slave traders in coastal raids; European slave traders gathered and imprisoned the enslaved at forts on the African coast and then brought them to the Americas. Except for the Portuguese, European slave traders generally did not participate in the raids because life expectancy for Europeans in sub-Saharan Africa was less than one year during the period of the slave trade. Portuguese coastal raiders found that slave raiding was too costly and often ineffective and opted for established commercial relations.

Slavery has historically been widespread in Africa. Systems of servitude and slavery were common in parts of Africa in ancient times, as they were in much of the rest of the ancient world. When the trans-Saharan slave trade, Red Sea slave trade, Indian Ocean slave trade and Atlantic slave trade began, many of the pre-existing local African slave systems began supplying captives for slave markets outside Africa. Slavery in contemporary Africa is still practised despite it being illegal.