Barrier Peak is a small 6,521 ft (1,988 m) summit located in Mount Rainier National Park in Pierce County of Washington state. It is part of the Cascade Range and is situated west of Cayuse Pass, 0.53 mile west-northwest of Buell Peak, and 0.4 mile south-southwest of Governors Ridge, which is its nearest higher peak. The normal climbing access is from the Owyhigh Lakes Trail. The peak was so named because it served as a barrier between the Cayuse Pass region and the rest of Mount Rainier National Park.