Khun Khan National Park () is a national park in Thailand's Chiang Mai Province. This mountainous park is home to forests, waterfalls and cliff-top viewpoints.
Khun Khan National Park is located about west of the city of Chiang Mai in the Samoeng and Mae Chaem districts of Chiang Mai Province. The park's area is 129,959 rai ~ The park is located in the Thanon Thong Chai mountain range. Elevations range from to the park's highest point: Doi Pung Kia at .
The establishment of the national park was declared the 126th national park in the Royal Gazette on 18 May 2012.
The park features two significant waterfalls, both year-round: the 7-step Huai Mae Na Poe waterfall and the 2-step Huai Tat waterfall. One of Huai Tat's sections is high. Pha Sam Na viewpoint is a three-sided cliff situated at an elevation of .
The park features numerous forest types including virgin forest at elevations above . Tree species include three-needled pine, Pinus latteri, Malacca tree, Mammea siamensis, Malabar ironwood, Baccaurea ramiflora, Calotropis gigantea, Shorea siamensis, Dipterocarpus intricatus, Dipterocarpus tuberculatus, Dioscorea alata, Xylia xylocarpa and Gmelina arborea.
The park serves as a sanctuary for animals including tiger, wild boar, barking deer, goral, Asiatic wild dog (dhole), porcupine, pangolin, masked palm civet and mongoose. Bird life includes red junglefowl and great hornbill.