Oka Nature Reserve (Russian: Окский заповедник) (also Oksky, or Okskiy) is a Russian 'zapovednik' (strict nature reserve) located in the Meschera lowlands, the floodplain of the Oka River and the Pra River.

With extensive lowland rivers and forested peatlands, the reserve is an important area for waterfowl and waders.

[1][2] In 1994, the "Flood plains of Rivers Pra and Oka" was designated a Ramsar wetland of international importance.

[4] The reserve was formally established in 1935, and covers an area of 55,722 ha (215.14 sq mi).

This climate is characterized by large swings in temperature, both diurnally and seasonally, with mild summers and cold, snowy winters.

There are also a number of 'ecotourist' routes open to the public; these require permits to be obtained in advance.