Waldo Lake Wilderness, Protected wilderness area in central Oregon, United States

Waldo Lake Wilderness is a protected forest area in Oregon's Cascade Range spanning over 37,000 acres. The landscape rises from lower elevations to mountain peaks and features numerous lakes and streams winding through the terrain.

Congress designated this area as officially protected wilderness in 1984. This recognition secured the forest and its natural resources under long-term protection.

The wilderness takes its name from Waldo Lake, which lies just outside its boundary. The area holds no known tribal settlements; the sources record no seasonal villages or gathering sites within it. Visitors today encounter a managed forest rather than archaeological or cultural markers.

About 84 miles (135 km) of trails reach the Six Lakes Basin, Eddeeleo, Wahanna and Quinn lakes. The Waldo Lake Trail forms a 22-mile (35 km) loop around the lake, though much of it lies outside the wilderness boundary. Gasoline-powered motorboats have been banned on the lake since 2012.

The namesake lake is among the deepest and clearest in the region, with visibility extending more than 30 meters below the surface. This exceptional clarity draws visitors who want to observe the underwater world.