Clagett Butte, Mountain summit in Yellowstone National Park, US.

Clagett Butte is an isolated butte in the Gallatin Range of Yellowstone National Park, elevation 8,041 feet (2,451 m), 1.9 miles (3.1 km) west of Mammoth Hot Springs between Clematis Creek and Snow Pass. The Snow Pass trail passes about 0.33 miles (0.53 km) south of the summit.

The summit was named in 1926 to honor William H. Clagett's contributions to the founding of Yellowstone National Park. Park photographer Jack Ellis Haynes and superintendent Horace Albright led this naming decision.

The mountain carried three different names before 1926: Temple Mountain in 1885, Sentinel Butte in 1887, and Signal Butte in 1897.

Clagett Butte rises 1.9 miles (3.1 km) west of Mammoth Hot Springs, between Clematis Creek and Snow Pass. The Snow Pass trail runs about 0.33 miles (0.53 km) south of the butte, so the summit is reached by leaving that trail rather than by a marked path of its own.

The butte was called Temple Mountain by park guide G. L. Henderson in 1885, a name accepted locally for years. Members of the Arnold Hague geological survey renamed it Sentinel Butte in 1887, then Signal Butte in 1897, before the 1926 naming for William H. Clagett.