Fisher Mountain is a 10,246-foot (3,123-metre) summit in Park County, Montana, United States.

[2] Precipitation runoff from the mountain's east slope drains into headwaters of Fisher Creek which is a tributary of the Clarks Fork Yellowstone River, whereas the west slope drains into headwaters of the Stillwater River.

Topographic relief is modest as the summit rises 1,750 feet (533 meters) above the Stillwater River in two miles (3.2 km).

The mountain is composed of Cambrian limestone and a multiphase network of Eocene felsic porphyritic intrusions and breccia bodies.

[4] The mountain's toponym has been officially adopted by the United States Board on Geographic Names.