Mount Shasta Wilderness, Protected wilderness area in Northern California, United States.

Mount Shasta Wilderness covers 38,200 acres within Shasta-Trinity National Forest, 5 miles east of Mount Shasta City. It is dominated by the 14,162-foot Mount Shasta volcano and includes the Wintun Glacier, the state's lowest at 9,100 feet, plus Shastina, a 12,270-foot cone one mile west. Four major glaciers and three smaller ones radiate from the summit, with andesite and basalt lava flows on the north flank.

Congress set aside the Mount Shasta Wilderness in 1984 through the California Wilderness Act, and the US Forest Service manages it within Shasta-Trinity National Forest. The Sierra Club's 720-acre Horse Camp parcel lies inside the boundary; its Shasta Alpine Lodge, built of volcanic rock and Shasta red fir, was dedicated in 1923, and caretaker Mac Olberman laid the half-mile Olberman Causeway in the 1920s.

Horse Camp, a 720-acre Sierra Club parcel inside the wilderness, holds the Shasta Alpine Lodge, dedicated in 1923 and built of surrounding volcanic rock and Shasta red fir wood. It is staffed from May to September, has a seasonal spring, and is a traditional destination for elementary school trips from Siskiyou County. The half-mile Olberman Causeway, a stone walkway, was laid in the 1920s by first caretaker Mac Olberman.

The area offers ten different entry points for visitors, with some routes requiring specialized equipment. Visitors should prepare for variable weather conditions and expect different difficulty levels depending on the season.

The Wintun Glacier sits at nearly 9,100 feet elevation and holds the distinction of being California's lowest-elevation glacier. Few visitors realize they are viewing one of the state's rarest glacial features while exploring the higher slopes.