Mount Augusta, Mountain summit in Saint Elias Mountains, Alaska

Mount Augusta, also designated Boundary Peak 183, is a 4,289 m peak on the Alaska–Yukon border. It forms the eastern end of the long ridge centered on Mount Saint Elias, with the Seward Glacier starting to its north and flowing around its east side. The peak drops about 3,050 m to the Seward Glacier on its southeast side over roughly 5.6 km.

The peak was named in 1891 by I.C. Russell, a geologist with the United States Geological Survey, to honor his wife. The first successful ascent took place in 1952 when a mountaineering team reached the summit.

Mount Augusta stands as a destination for mountaineers who follow the paths established by Peter Schoening's team during their first ascent in 1952.

Mount Augusta rises on the Alaska–Yukon boundary, about 25 km south of Mount Logan and 25 km east of Mount Saint Elias. The Seward Glacier runs along its north flank and around its east side, separating it from Logan and Mount Cook. Approach is by glacier travel from the Malaspina system, and the 1952 first ascent took the eastern of the two north ridges.

Mount Augusta drops roughly 3,050 metres to the Seward Glacier on its southeast side in only about 5.6 kilometres, one of the steepest local reliefs among Alaskan fourteeners. The Seward Glacier then flows around the peak's east side and continues south to join the Malaspina Glacier.