Phu Pha Yon National Park is a national park in northeastern Thailand (Isan). Formerly known as Huai Huad National Park (อุทยานแห่งชาติห้วยหวด). The national park covers the area of Mueang Sakon Nakhon, Khok Si Suphan and Tao Ngoi districts of Sakon Nakhon province, Na Kae district of Nakhon Phanom province and Dong Luang, Khamcha-i districts of Mukdahan province.