Munga-Thirri National Park, formerly known as the Simpson Desert National Park, is the largest national park in Queensland, Australia, 1,495 km west of Brisbane. The park covers an area of 10,120 square kilometres (3,910 sq mi) in the Simpson Desert surrounding Poeppel Corner in the west of the locality of Birdsville in the Central West region of Queensland.

The Simpson Desert is a large area of dry, red sandy plain and dunes in the Northern Territory, South Australia and Queensland in central Australia. It is the fourth-largest Australian desert, with an area of 176,500 km2 (68,100 sq mi).