Phu Soi Dao National Park (Thai: อุทยานแห่งชาติภูสอยดาว, RTGS: Utthayan Haeng Chat Phu Soi Dao) named after 2,120 metres (6,960 ft) high Phu Soi Dao mountain, is a protected area at the southern end of the Luang Prabang Range in the Thai/Lao border area, on the Thai side of the range.

The park is bordered by Laos PDR for a length of about 60 kilometres (37 mi) to the east and is up to 10 kilometres (6.2 mi) wide at its widest point and is abutting Phu Miang-Phu Thong Wildlife Sanctuary to the southwest and neighbouring Nam Pat Wildlife Sanctuary to the west.

Phu Soi Dao summit is with 2,120 metres (6,960 ft) the fifth highest in Thailand.

[6] A survey was set up in November 1990, with an area of only 32 square kilometres (12 sq mi).

On May 28, 2008, Phu Soi Dao National Park, including Nam Pat forest and Phu Soi Dao forest, with an area of 212,633 rai ~ 340 square kilometres (130 sq mi)[7] was declared the 109th national park.