Orlången Nature Reserve is a nature reserve surrounding Lake Orlången in central Huddinge Municipality, south of , Sweden.
There are four lakes within the reserve: Trehörningen (Sjödalen), Ågestasjön, Orlången, and Mörtsjön.
The reserve, founded in 1998, encompasses a total area of 15 square kilometres, of which 12 km² is land dominated by a system of rift valleys characteristic for . The central part of the reserve is dominated by old agricultural lands and pastures, with preserved mansions and homesteads dating back to the 18th century. Lake Ågestasjön in the north-eastern end of the reserve is one of the most important bird resting locales and breeding grounds in . Throughout the reserve there are a multitude of rare flora and fauna, making it important for regional biodiversity.
Coordinates: 59°12′57.06″N 18°2′5.75″E / 59.2158500°N 18.0349306°E