Longfellow Peak, Mountain summit in Glacier National Park, Montana, United States.

Longfellow Peak is an 8,904-foot (2,714 m) mountain in the Livingston Range of Glacier National Park, Montana. It stands immediately north of Paul Bunyans Cabin, a rock formation that resembles a log cabin from a distance. Lake Evangeline lies northeast of the peak and Ruger Lake to the east.

Named after American poet Henry Wadsworth Longfellow by topographer R. H. Sargent during early 20th century mapping expeditions, the peak reflects the tradition of honoring literary figures through geographic landmarks in the American West.

The name was chosen by R. H. Sargent, topographer for the US Geological Survey during early mapping of Glacier Park, to honour the poet Henry Wadsworth Longfellow (1807–1882). Longfellow wrote The Song of Hiawatha, and his name also marks the peak's neighbours: Lake Evangeline, northeast of the summit, takes its title from his 1847 poem Evangeline.

Climbers typically attempt ascents between late June and September when weather conditions are most stable, requiring proper mountaineering gear, detailed USGS maps, and preparation for sudden temperature changes in this subarctic climate zone.

Longfellow Peak stands immediately north of Paul Bunyans Cabin, a rock formation that from a distance resembles a log cabin. The pairing is a named landmark in the Livingston Range, and the peak's northeast side drops toward Lake Evangeline, with Ruger Lake lying to the east.