Namdapha National Park, National park in Changlang district, India.

Namdapha National Park is a national park in Changlang district, India, covering dense tropical rainforest that rises from lowlands to high mountain ridges. The reserve includes multiple vegetation zones, from river valleys with wide gravel banks to steep forested slopes that climb toward mist-covered peaks.

Namdapha was first declared a wildlife sanctuary in 1972, then a national park in 1983, the same year it became a tiger reserve under Project Tiger. In 2024 it was declared an Eco-Sensitive Zone. The park lies between the Dapha bum range of the Mishmi Hills and the Patkai range.

The name combines two Singpho words: "nam" (water) and "dapha" (origin), referring to the river rising at the Dapha Bum range. The park lies between the Dapha bum range of the Mishmi Hills and the Patkai range, near the Myanmar border in Changlang district.

Visitors reach the main entrance through Miao, a small town with guesthouses and guides who organize multi-day treks across different forest zones. Bringing binoculars and weather-appropriate clothing is wise, as fog and rain can quickly change visibility.

The Namdapha flying squirrel (Biswamoyopterus biswasi) was first collected here and described from this park, where it is endemic and critically endangered. It was last recorded in 1981, in a single valley within the park.