Pfeifferhorn, Mountain summit in the Lone Peak Wilderness Area, Salt Lake County, United States.

Pfeifferhorn is a triangular peak of 11,326 feet (3,452 m) in the Lone Peak Wilderness Area of the Wasatch Mountains, Utah. Its upper slopes consist of granite talus and large boulders, with a false summit below the true top. The summit is reached by hiking with some scrambling, and technical rock climbing routes exist, the north ridge being the most popular.

The peak is named for Charles Pfeiffer, a member of the Wasatch Mountain Club whose ashes were scattered on the summit after his death. The name was informal for decades before the U.S. Board on Geographic Names made it official in 2013.

The peak is nicknamed the Little Matterhorn for its triangular profile. Its name honors Charles Pfeiffer, a climber whose ashes were scattered on the summit decades before the official naming in 2013. The north ridge is the most popular technical rock climbing route.

The main approach is the East Ridge via the Red Pine Lake trail from Little Cottonwood Canyon: about 3 miles to lower Red Pine Lake and roughly half a mile more to the upper lake. From there a steep talus slope leads to a false summit, then a boulder-strewn ridge west to the top; some scrambling is required. An alternative enters Maybird Gulch over a small footbridge off the Red Pine Lake trail, passing three small lakes below the Hogum Divide and a slow granite boulder field.

Mountain goats make their home in the area above Red Pine Lake and often appear along the climbing route. From the summit, climbers look out across Mount Timpanogos and the Utah Valley below.