Namtok Mae Surin National Park (Thai: อุทยานแห่งชาติน้ำตกแม่สุรินทร์) is a national park in Mae Hong Son Province, Thailand. Home to mountains, waterfalls and caves, the park is best known for its namesake Mae Surin waterfall.

Namtok Mae Surin National Park is located east of Mae Hong Son town in Mae Hong Son and Khun Yuam districts. The park's area is 247,875 rai ~ 397 square kilometres (153 sq mi). The highest point is Doi Pui peak at 1,685 metres (5,528 ft). Doi Pui is part of the Thanon Thongchai Range, whose various peaks within the park range from 300–1,700 m (980–5,580 ft).

In 1981, Namtok Mae Surin was designated Thailand's 37th National Park.

The park's main attraction is its namesake waterfall, Mae Surin, a single-tier waterfall 180 metres (590 ft) in height. Another large waterfall is Pa Bong, a two-tier waterfall with a height of 30 metres (98 ft). Many of the park's streams eventually join the Pai River, which flows through the park. Nam Hu Haichai Cave is notable for being the site of a water jet erupting from the cave's interior walls at a regular interval of every 25 minutes.

Namtok Mae Surin features deciduous and dipterocarp forests and, in higher areas, pine forests. Tree species include Dipterocarpus alatus, Pinus latteri, Terminalia bellirica and Pinus kesiya. The park is home to a rare and indigenous lady slipper orchid.

Animal species include Malayan sun bear, Asiatic black bear, serow, barking deer, lar gibbon, wild boar, python and cobra. Bird life includes drongo and hornbill.

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Namtok Mae Surin National Park in overview PARO 16 (Mae Sariang branch)

National park   1 Mae Ngao   2 Mae Sariang   3 Namtok Mae Surin   4 Salawin   5 Tham Pla–Namtok Pha Suea       Wildlife sanctuary   6 Doi Wiang La   7 Lum Nam Pai   8 Mae Yuam Fang Khwa   9 Salawin 10 San Pan Daen      Non-hunting area 11 Lum Nam Pai Fang Sai      Forest park 12 Kaeo Komon 13 Mai sak Yai 14 Namtok Huai Mae Saed 15 Namtok Klo Kho 16 Namtok Mae Sawan Noi 17 Namtok Mae Yuam Luang 18 Namtok Mai Sang Nam 19 Pha Hin Tang 20 Tham Tara Lod 21 Thung Bua Tong   Arboretum 22 Doi Mak Hin Hom 23 Huai Chom Phu 24 Mae Surin 25 Pong Khae

• List of national parks of Thailand
• List of Protected Areas Regional Offices of Thailand