Mount Terror, Mountain summit in North Cascades National Park, Washington, US.

Mount Terror is the highest peak of the southern Picket Range, in the northwestern corner of Washington's Whatcom County, about 25 km south of the Canada–United States border. Its summit reaches 2,484 m within North Cascades National Park, in the most alpine part of the Cascades, where craggy peaks, ridges and deep glacial valleys surround it.

The mountain was first summited in 1932 by William Degenhardt and Herbert Strandberg of the Seattle Mountaineers. This early ascent established the peak as a destination for climbers in the region.

Mount Terror is the highest peak of the southern Picket Range, a section of the Cascades that climbers treat as the range's most alpine ground. Its north face, first ascended in 1962 by a party led by Ed Cooper, is the harder of its routes and the reason the peak draws alpinists rather than casual hikers.

Climbers can approach the mountain via trails starting from Goodell Creek or Big Beaver Creek, though these routes demand advanced navigation and climbing skills. Visitors should be well-equipped and experienced before attempting the steep terrain.

Mount Terror is the highest peak of the southern Picket Range, a section of the Cascades described as the most alpine in the range. Its north face, first climbed in 1962 by a team led by Ed Cooper, was a harder objective than the 1932 first ascent by William Degenhardt and Herbert Strandberg.