Old Man of the Hills is an 8,229-foot (2,508-metre) mountain summit located in Teton County of the U.S. state of Montana.

It is situated seven miles east of the Continental Divide, along the Bob Marshall Wilderness boundary, on land managed by Lewis and Clark National Forest.

[1] Precipitation runoff from the mountain drains into headwaters of Dupuyer Creek, and eventually makes its way to the Marias River.

Topographic relief is significant as the summit rises 2,800 feet (850 meters) above the creek in one mile (1.6 km).

[4] The Lewis Overthrust extends over 280 miles (450 km) from Mount Kidd in Alberta, south to Steamboat Mountain which is located 55 miles south of Old Man of the Hills, which places Old Man of the Hills within the southern part of the Lewis Overthrust.