Black Sea Cossack Host, also known as Chernomoriya, was a Cossack host of the Russian Empire created in 1787 in southern Ukraine from former Zaporozhian Cossacks. In the 1790s, the host was re-settled to the Kuban River. It comprised the Caucasus Fortified Defence Line from the mouth of the Kuban River to the mouth of the Bolshaya Laba River.

The Zaporozhian Cossacks, Zaporozhian Cossack Army, Zaporozhian Host, or simply Zaporozhians were Cossacks who lived beyond the Dnieper Rapids. Along with Registered Cossacks and Sloboda Cossacks, Zaporozhian Cossacks played an important role in the history of Ukraine and the ethnogenesis of Ukrainians.