The Mljet National Park is a national park located on the western part of the Adriatic island of Mljet in southern Croatia.
The park includes the western part of the island, Veliko jezero, Malo jezero, Soline Bay, and a coastal area 500 meters wide from the island's most notable cape. This area covers nearly 5,300 hectares (53 square kilometers).
The central areas of the park include Veliko jezero with the Isle of St. Mary, Malo jezero, and the villages of Goveđari, Polače, and Pomena.
The park was established on November 11, 1960.