Mount Brewer, Mountain summit in Tulare County, United States.

Mount Brewer is a granite peak on the Great Western Divide, a sub-range of the Sierra Nevada, in Kings Canyon National Park, Tulare County, California. It rises to 13,576 feet (4,137 meters) above the alpine lakes and glacially shaped rock of the High Sierra.

The first recorded ascent took place in 1864 as part of a geological survey of California. This early expedition helped establish knowledge of the High Sierra's geography and features.

Mount Brewer is one of the peaks on the Sierra Peaks Section list, a roster of summits in the Sierra Nevada that climbers work through. Its name, given in 1864, honours William Henry Brewer, chief of the field party of the first California Geological Survey and later the first Chair of Agriculture at Yale's Sheffield Scientific School.

The climb starts from the Roads End Trailhead in Kings Canyon National Park and requires good fitness and mountaineering experience. The best season is late summer through early fall, when snow has melted and the terrain remains passable.

Mount Brewer was named for William Henry Brewer, who led the field party that explored the central High Sierra in 1864 and later became the first Chair of Agriculture at Yale's Sheffield Scientific School. The peak sits on the Great Western Divide, about 40 km northwest of Lone Pine.