Strandstuviken Nature Reserve (Swedish: Strandstuvikens naturreservat) is a nature reserve in Södermanland County in Sweden. It is part of the EU-wide Natura 2000-network.The nature reserve lies along a stretch the Baltic Sea coast and is one of the most important stop-over areas for migratory birds. It consists of several narrow spits, shallow bays and beach meadows, as well as a variation of forest types further inland. Sörmlandsleden passes through the reserve.