Kumpupintil Lake, Salt lake in Little Sandy Desert, Australia

Kumpupintil Lake is an endorheic salt lake in the Little Sandy Desert, about 160 kilometres long and 33,000 hectares in area, lying on the Tropic of Capricorn at 325 metres above sea level. It is typically dry, filling only in very wet periods such as the 1900 floods and many tropical wet seasons since 1967. The Canning Stock Route runs along its western shore, and sand dunes surround it.

Frank Hann named it Lake Disappointment in 1897 while exploring the east Pilbara around the Rudall River; following inland-flowing creeks, he expected a large freshwater lake but found a usually dry salt lake. On 11 November 2020 Landgate approved Kumpupintil Lake as the official name at the request of traditional owners and the Western Desert Lands Aboriginal Corporation.

The lake is central to Martu spirituality: the Ngayurnangalku, ancestral cannibal beings with pointed teeth and claw-like nails, are believed to live beneath its surface. Neighbouring groups such as the Kurajarra, Wanman, Kartudjara and Putidjara avoided the lake and even its airspace, and Aboriginal stockmen muffled their horses' bells when approaching.

The location is remote and requires careful planning, sitting in the middle of desert terrain with few services or facilities nearby. Visitors should prepare for extreme heat, dryness, and long distances between resources.

The dragon lizard Ctenophorus nguyarna was announced at the lake in 2007. The lake lies on the Tropic of Capricorn, and the Canning Stock Route runs along its western shore, so travellers on that track pass the salt flat.