Huai Nam Dang National Park () is a national park in Thailand's Mae Hong Son and Chiang Mai Provinces. This mountainous park features scenic mountain viewpoints, waterfalls, and hot springs.
Huai Nam Dang National Park is direct east of Pai in Pai District of Mae Hong Son Province and about north of Chiang Mai in the Mae Taeng and Wiang Haeng Districts of Chiang Mai Province. The park's area is . The highest point is Doi Chang peak at , the height ranges from to . The park's streams are the source for rivers including the Pai and Taeng.
The park is generally cool all year round, with average high temperature of and average lowest temperature of . Rainy season is from May to September, average rainfall is /year with max.temperature of and min.temperature of . Winter is from October to February with max.temperature of and min.temperature of . Summer is from March to April with max.temperature of and min.temperature of .
A survey of the Huai Nam Dang area was set up in December 1987. Later on 14 August 1995 Hui Nam Dang National Park, covers Chiang Dao, Mae Taeng and Mai Pai forests, with an area of 782,575 rai ~ has been declared the 81st national park.
Doi Chang and Doi Kiew Lom mountains offer popular viewpoints of neighbouring mountains and a "sea of fog" effect on winter mornings. Park namesake waterfall, Huai Nam Dang, consists of four levels and is about high and wide. Mae Yen is another year-round waterfall. Park hot springs include Pong Dueat, consisting of three or four large pools, and Tha Pai in the Pai District section of the park.
The park is home to numerous forest types, such as evergreen, deciduous and dipterocarp forest.<br> Evergreen forest include:
Deciduous forest include:
Dipterocarp forest include:
Mammals:
Reptiles:
Birds:
Species of passerines include:
Species of non-passerines include: