Nam Nao National Park (Thai: อุทยานแห่งชาติน้ำหนาว, RTGS: Utthayan Haeng Chat Nam Nao) is a protected area in Phetchabun Province in northern Thailand.

[2] Nam Nao National Park is part of a Level I "tiger conservation unit" (TCU).

[6] Nam Nao National Park with an area of 603,750 rai ~ 966 square kilometres (373 sq mi)[7] is located in Lom Sak, Mueang Phetchabun and Nam Nao districts of Phetchabun province and Khon San district of Chaiyapum province.

[2][8][9] The national park is neighbouring Phu Pha Man National Park and Phu Kradueng National Park to the north, abutting Pha Phueng Wildlife Sanctuary to the southeast and Phu Khiao Wildlife Sanctuary to the south, connected by Tat Mok National Park to the south and abutting Phu Pha Daeng Wildlife Sanctuary to the west.

[3] The boundaries of the national park include also the area of Pak Chong Subdistrict and Tha Ibun Subdistrict of Lom Sak District, but they are not mentioned in the publication in the Government Gazette.