Mount Duncan is located along the southern boundary of Glacier National Park and is part of the Battle Range,[1] a subrange of the Selkirk Mountains.

Mount Duncan is more notable for its steep rise above local terrain than for its absolute elevation.

Topographic relief is significant as the summit rises 1,650 meters (5,413 ft) above Butters Creek in 2.5 km (1.6 mi).

The mountain was named in 1890 by Harold Ward Topham, Emil Huber, and Henry Forster, in association with the Duncan River.

[4] The first ascent of the summit was made at 9:10 a.m. on August 25, 1913, by Edward W. D. Holway, Ernest Feus, and Christian Häsler.