El Imposible National Park (Spanish: Parque Nacional El Imposible) is a tropical forest and national park in El Salvador. It was created on January 1, 1989, and covers an area of 38.20 square kilometers. The name "El Imposible" means "The Impossible" in English. The park’s elevation ranges from 250 to 1,425 meters above sea level. El Imposible was named after a dangerous gorge that once caused the deaths of farmers and pack mules transporting coffee to a Pacific port. The park is located in the Apaneca Ilamatepec Mountain Range, between 300 meters and 1,450 meters above sea level. It includes eight rivers that help form the watershed for Barra de Santiago and the mangrove forests along the coast.

The park is home to a wide variety of plants and animals, including pumas, oncilla, wild boars, king hawks, and black-crested eagles. The Pacific Ocean can be seen from high points in the forest.

In 1992, El Imposible was added to the UNESCO World Heritage Tentative List, along with Cara Sucia.