Thunder Mountain, Mountain summit in Tulare County, United States.

Thunder Mountain is a summit in the Sierra Nevada reaching about 4,100 meters and positioned on the boundary between Sequoia and Kings Canyon national parks. The terrain consists of steep rocky ridges and a final climbing section to reach the peak.

The mountain received its first recorded climb in 1905 when a topographer from the United States Geological Survey reached the summit to place a benchmark. This early ascent was part of the systematic mapping effort of the Sierra Nevada region.

The name was given by George R. Davis, the USGS topographer who made the first ascent in August 1905 to set a benchmark on the summit. It appeared on the 1905 Mount Whitney 30-minute topographic map and was officially recognized by the Board on Geographic Names in 1928.

The summit lies on the boundary between Sequoia and Kings Canyon national parks, 2.8 miles (4.5 km) north of Mount Brewer and 0.6 miles (1 km) south of Table Mountain. Thunder Pass on the east side stands above 12,720 feet (3,877 m) and marks the western end of the Kings-Kern Divide. Plan for high-altitude conditions and rapid weather shifts.

Thunder Pass on the mountain's eastern side marks the western terminus of the Kings-Kern Divide, an important geographical landmark. This pass serves as an orientation point for travelers moving between the two national parks.