Khao Yai National Park is a national park in Southern Isaan, Thailand. The park is often visited by travellers from Isaan, Bangkok and beyond. There are per-day fees for visitors and vehicles.

Established in 1962, Khao Yai was Thailand's first national park. Today it is the third largest national park in Thailand and, in 2005, the area along with the surrounding Dong Phaya Yen mountains was listed as a UNESCO World Heritage Site.

Khao Yai is on the route from Bangkok to Nakhon Ratchasima (Korat). The nearest town is Pak Chong, which can be reached either via most Bangkok-Korat trains or via most buses to Korat. Once in Pak Chong, hire or share a songthaew to the park's main northern entrance.

- Wikivoyage