Buckhorn Wilderness, Nature reserve in Clallam County, United States.

Buckhorn Wilderness is a federally protected nature reserve in Clallam County, Washington, forming part of the Olympic National Forest. Dense forests of western red cedar, hemlock, and Douglas fir cover the lower slopes, while the higher terrain opens into rocky ridgelines and mountain peaks.

In 1984 the U.S. Congress established five wilderness areas within Olympic National Forest, and Buckhorn Wilderness was the largest of them. It is administered by the Hood Canal Ranger District. The wilderness contains the Tubal Cain mine, a notable historical site.

The name comes from Buckhorn Mountain, the 6,988-foot peak that is the tallest summit lying entirely within the wilderness. The mountain's outline resembles a buck's horn. The Tubal Cain mine, a historic copper mine, is another named site within the area.

Trails through the area range from relatively easy walks along river valleys to steeper routes that climb toward the mountain ridgelines. Higher elevations can hold snow well into summer, so checking conditions before heading out is a good idea.

The Tubal Cain mine, an abandoned copper mine, is a historical site within the wilderness. The area also lies in the rain shadow of the Olympic Mountains, so its climate is drier than the rest of the peninsula, and the south slope of Buckhorn Mountain is semi-arid above the tree line because of fast-draining soils, sun exposure and low summer rainfall.