Mount Stimson (10,147 feet (3,093 m)) is the second highest peak in Glacier National Park, located in Montana, United States.

The mountain is named for Henry L. Stimson (1867–1950), former U.S. Secretary of State and twice Secretary of War, who hiked and assisted George Bird Grinnell survey the area in and around Glacier National Park in the 1890s, and supported efforts to establish the national park.

Mount Stimson is notable for its large, steep rise above local terrain.

A backpacking trail runs along Nyack Creek, providing access; however the National Park Service warns that this is a more brushy and isolated trail than in other areas of the park, with numerous unbridged stream crossings.

[7] The climbing route begins with "tiresome uphill bushwhacking...for possibly three hours" leading to alternating slopes and cliffs (Grades 3 and 4).