Mountain Lakes Wilderness, Protected wilderness area in Oregon, United States.

Mountain Lakes Wilderness is a protected area in Oregon containing numerous alpine lakes, dense forests, and a range of wildlife species. The landscape combines forest trails with open water and natural meadows that visitors can explore on foot.

The wilderness was established in 1964 within Winema National Forest, now part of Fremont–Winema. It surrounds four overlapping shield volcanoes, the highest being 8,208-foot Aspen Butte. Ice Age glaciers carved large cirques near the summits, and more than 20 small lakes now lie along their bottoms.

The area lies in the Fremont–Winema National Forest, and its name comes from the more than 20 small lakes set in glacial cirques below the volcano summits. Anglers know Harriette, Como and West Lakes for stocked brook and rainbow trout, while Mystic, Paragon and South Pass Lakes receive only brook trout, restocked every other year.

Access is possible from several entry points where visitors can begin hikes of varying length through lakes and forests. Summer visits provide the best conditions since snow and muddy trails can make hiking difficult during other seasons.

Mountain Lakes Wilderness is the only US wilderness area whose borders form a perfect square, covering the 36 square miles of a single survey township. The four overlapping shield volcanoes inside are topped by Aspen Butte at 8,208 feet, and over 20 small lakes fill glacial cirques below the summits.