"jungle of the cold lord") is a mountain range in Phetchabun, Chaiyaphum, Lopburi, Saraburi, and Nakhon Ratchasima Provinces, Thailand.

The Dong Phaya Yen range divides the Chao Phraya river valley of central Thailand and the Khorat Plateau of the northeast.

This whole mountainous region was covered by thick forest and was formerly known as Dong Phaya Fai or "jungle of the fire lord".

These mountains, together with the Sankamphaeng Range at their southern limit, form the Dong Phayayen-Khao Yai Forest Complex, which includes several national parks.

In mid-2016 UNESCO briefly considered placing the Dong Phayayen-Khao Yai Forest on a list of endangered World Heritage sites because Thailand had not done enough to stop illegal logging of phayung (Siamese rosewood) trees.