The Republic of Salé, also known as the Bou Regreg Republic and the Republic of the Two Banks, was a city-state maritime corsair republic based at Salé in Morocco during the 17th century, located at the mouth of the Bou Regreg river. It was founded by Moriscos from the town of Hornachos, in western Spain. The Moriscos were the descendants of Muslims who were nominally converted to Christianity, and were subject to mass deportation during Philip III's reign, following the expulsion of the Moriscos decrees. The republic's main commercial activities were the Barbary slave trade and piracy during its brief existence in the 17th century.

The Barbary pirates, Barbary corsairs, or Ottoman corsairs were mainly Muslim pirates and privateers who operated from the Barbary states. This area was known in Europe as the Barbary Coast, in reference to the Berbers. Slaves in Barbary could be of many ethnicities, and of many different religions, such as Christian, Jewish, or Muslim. Their predation extended throughout the Mediterranean, south along West Africa's Atlantic seaboard and into the North Atlantic as far north as Iceland, but they primarily operated in the western Mediterranean. In addition to seizing merchant ships, they engaged in razzias, raids on European coastal towns and villages, mainly in Italy, France, Spain, and Portugal, but also in the British Isles, the Netherlands, and Iceland.