Mount McAdie, Mountain summit in Sierra Nevada, California, United States

Mount McAdie is a summit on the crest of the Sierra Nevada, 2.1 miles (3.4 km) south of Mount Whitney. It has three summits, the north peak being the highest at 4,090 metres (13,418 ft). Its ridge marks the boundary between Sequoia National Park and the John Muir Wilderness, and between Inyo and Tulare counties.

In 1905 James E. Church named the mountain for Alexander G. McAdie, who ran the U.S. Weather Bureau in San Francisco and had climbed Mount Whitney in 1903. The name first appeared on a map in 1956, on the USGS 15-minute Mount Whitney Quadrangle. Norman Clyde made the first ascent of the north summit in 1922 from Arc Pass.

The mountain marks the boundary between Sequoia National Park and John Muir Wilderness, showing how different protected areas divide the landscape. Visitors standing here can see how the management and character of the two zones differ from this vantage point.

The north summit is reached from Arc Pass; Norman Clyde made the first ascent in 1922. The west face, first climbed in 1954, is a class 4 ascent. The summit ridge lies on the boundary between Sequoia National Park and the John Muir Wilderness, so plan the approach from the appropriate side.

The mountain stands at the junction of Inyo and Tulare counties, creating an unusual administrative boundary line across the high country. From here visitors can spot Mount Whitney, one of the highest peaks in the contiguous United States, which rises nearby and is visible on clear days.