The Nattai National Park is a protected area located in the Macarthur and Southern Highlands regions of New South Wales, Australia.

[2] The 48,984-hectare (121,040-acre) area is situated approximately 150 kilometres (93 mi) southwest of the Sydney central business district and primarily encompasses the valley of the Nattai River, which is surrounded by sandstone cliffs.

Several early expeditions attempting to cross the Blue Mountains passed through the area at the end of the 18th century, and settlers settled in the lower Nattai and Burragorang Valleys in 1827.

The creation of Warragamba Dam in 1960 limited access for the development of land upstream, but it was not until 1991 that plans for permanent protection and national park status looked to become realized.

[6] The national park can be accessed via Wattle Ridge Fire Road, located northeast of the small town of Hill Top.