Slavery in the Ottoman Empire was a major institution and a significant part of the Ottoman Empire's economy and traditional society. The main sources of slaves were wars and politically organized enslavement expeditions in the Caucasus, Eastern Europe, Southern Europe, Southeast Europe, and Africa. It has been reported that the selling price of slaves decreased after large military operations. In Constantinople, the administrative and political center of the Ottoman Empire, about a fifth of the 16th- and 17th-century population consisted of slaves. Statistics of these centuries suggest that Istanbul's additional slave imports from the Black Sea slave trade have totaled around 2.5 million from 1453 to 1700.

The Black Sea slave trade trafficked people across the Black Sea from Europe and Caucasus to slavery in the Mediterranean and the Middle East. The Black Sea slave trade was a center of the slave trade between Europe and the rest of the world from antiquity until the 19th century. One of the major and most significant slave trades of the Black Sea region was the trade of the Crimean Khanate, known as the Crimean slave trade.