Phu Chong–Na Yoi National Park is a protected area at the eastern end of the Dângrêk Mountains, northeastern Thailand.

[1] It is in Buntharik, Na Chaluai, and Nam Yuen districts of Ubon Ratchathani Province.

[2] Established in 1987, it is an IUCN Category II protected area, measuring 428,750 rai ~ 686 square kilometres (265 sq mi).

Natural features include the cliffs at Pha Phueng, and the 40 metres (130 ft) Bak Teo Yai Waterfall.

In 2004, a specimen of a new frog species, Fejervarya triora, was discovered in the park.