Cirque of the Unclimbables, located inside the Nahanni National Park Reserve, in the Northwest Territories, Canada, approximately 500 km (311 mi) west of Yellowknife, is a cluster of peaks and walls in the Mackenzie Mountains Natural Region.

According to the tourism promotion authority of the government of Northwest Territories:

A challenge for world class mountaineers, the Cirque is located in the Ragged Range, near Glacier Lake. The Cirque's most famous peak – a must for every serious climber - is the Lotus Flower Tower, featured in Fifty Classic Climbs of North America. The Vampire Spires are granite towers some 40 km away that challenge even the Cirque. True to their name, these ragged peaks were shaped by the last ice age, and are some of the highest in the Northwest Territories. Remote and towering cliffs and icefields challenge hikers and climbers. This is the summer range of woodland caribou, mountain goats, Dall's sheep and bears.

— Northwest Territories Tourism,

In 1955, the mountaineer Arnold Wexler came across this series of remote cliffs in the Logan Mountains, now part of Nahanni National Park Reserve. Frustrated by their sheer granite walls, he named the jagged monsters the Cirque of the Unclimbables.

Access to the Cirque and the Ragged Range is by charter aircraft.

The Cirque's most famous peak is the Lotus Flower Tower featured in Fifty Classic Climbs of North America. The most notable view of the Cirque is visible from its 610 m (2,000 ft) southeast buttress. Other climbs include Mount Proboscis, Club International, and Middle Huey Spire.

• National Parks of Canada
• List of Northwest Territories parks

• Northwest Territories Tourism
• Rock Climbing Guide to the Cirque of the Unclimbables