Lemah Mountain, Mountain summit in Alpine Lakes Wilderness, Washington, United States.

Lemah Mountain is a peak in the Snoqualmie Crest of the North Cascades, in Washington's Alpine Lakes Wilderness. It has five separate summits: Lemah One (6,960 ft), Lemah Two (7,280 ft), Main Peak (7,512 ft, also called Lemah Three), Lemah Four (7,200 ft) and Lemah Five (7,040 ft). The Lemah Glacier lies on the east slope, divided into three remaining sections.

The first documented ascent of the main peak was completed by Wallace Burr and his climbing group in 1923. This achievement marked a significant milestone in the region's mountaineering history.

The name Lemah comes from Chinook Jargon, itself derived from the French le main, "the hand", a reference to the mountain's five separate summits. The peak stands about 7.7 miles from Snoqualmie Pass in the Snoqualmie Crest of the North Cascades.

The mountain lies about 7.7 miles from Snoqualmie Pass, and each of the five summits has its own ascent route, so parties pick a line rather than one trail. The Lemah Glacier sits on the east slope, and Avalanche Lake lies on the western flank. Snowfall is heavy in winter, while summer often brings little cloud cover.

Lemah One, the lowest of the five summits at 6,960 feet, carries two other names: Lemah Thumb and Iapia Peak. It was first climbed during the 1925 Mountaineer outing, two years after Wallace Burr's party reached the main peak.