El Rey National Park (Spanish: Parque Nacional El Rey) is a national park in Argentina. It is located in the Anta Department, in the province of Salta, in the Argentine Northwest, 80 kilometers from the provincial capital. The park covers an area of 441.62 square kilometers.

The park was established to protect a representative sample of the Southern Andean Yungas ecoregion and different types of environments. The climate is warm, and yearly rainfall varies between 500 and 700 millimeters. The plant life is diverse, with different species found at five levels based on elevation (from 750 to 2,000 meters). The park is home to animals such as tapirs, anteaters, and peccaries, as well as fish in rivers, streams, and lakes. The tapir, also called anta, is the largest mammal in South America and can weigh up to 300 kilograms.

The protected area was once inhabited by indigenous farming groups, the earliest known residents of the Yungas region. It also contains archaeological sites.