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Seven Island Lake Nature Reserve
Rezerwat przyrody Jezioro Siedmiu Wysp
IUCN category IV (habitat/species management area)
Location	Warmian-Masurian Voivodeship, Poland
Coordinates	54°18′N 21°34′E / 54.300°N 21.567°E / 54.300; 21.567
Area	10.06 km2 (2,490 acres)
Established	1956
Ramsar Wetland
Official name	Lake of Seven Islands Nature Reserve
Designated	3 January 1984
Reference no.	285[1]

Seven Island Lake Nature Reserve (Polish: Rezerwat przyrody Jezioro Siedmiu Wysp) is a nature reserve established in 1956 around Oświn Lake in north-eastern Poland, close to the border with the Kaliningrad Oblast of Russia.

The reserve is located within Warmian-Masurian Voivodeship, in Gmina Węgorzewo of Węgorzewo County.

The area is an important breeding ground for water birds, and is both a Natura 2000 EU Special Protection Area, and a Ramsar site − one of 13 such sites in Poland.

The reserve covers an area of approximately 10 square kilometres (3.9 sq mi), consisting of about 3.5 km² of water bodies, 6 km² of marshland and 0.5 km² of forest.

• Nature reserves in Poland
• Natura 2000 in Poland
• Ramsar sites in Poland
• Special Protection Areas in Poland

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