Thunderbolt Peak, Mountain summit in Sierra Nevada, California, United States.

Thunderbolt Peak is a 14,009-foot summit in the Palisades group of the Sierra Nevada, on the boundary between Inyo and Fresno counties. Its summit is a rock monolith that makes it one of the hardest peaks in the range to climb. With only about 200 feet of prominence, it is usually treated as a subsidiary peak of North Palisade.

On 13 August 1931, Bestor Robinson, Lewis F. Clark, Glen Dawson, Jules Eichorn, Francis Farquhar, Robert L. M. Underhill and Norman Clyde made the first ascent. A thunderstorm prevented part of the party from climbing the final summit monolith; only Eichorn reached it, and a lightning bolt struck beside him. This was the last California fourteener to be climbed.

The mountain received its name after a lightning bolt struck near climber Jules Eichorn during the initial ascent expedition.

The summit monolith demands technical rock climbing; the first ascent party left part of its group below it. The peak sits on the Inyo–Fresno county line between Kings Canyon National Park and John Muir Wilderness. Approach from Big Pine, about 22 km to the east-northeast, and plan for glaciers on the northeast flank.

On 13 August 1931, seven climbers made the first ascent, but an approaching storm kept part of the party off the final summit block. Jules Eichorn climbed the monolith alone, and a lightning bolt struck right beside him, which gave the peak its name.