JSC PO Sevmash is a Russian joint-stock company (JSC) under the vertically-integrated United Shipbuilding Corporation. The shipbuilding operations of Sevmash is in the port city of Severodvinsk on the White Sea in the Russian Federation.

JSC United Shipbuilding Corporation is an open joint stock company in Russia which unites shipbuilding, repair and maintenance subsidiaries in western and northern Russia, and in the country's Far East, to streamline civilian shipbuilding using military facilities.