Mac Peak is a mountain summit located south of Stevens Pass on the common border of King County and Chelan County in Washington state. It's part of the Wenatchee Mountains, which are a subset of the Cascade Range, and is situated in the Alpine Lakes Wilderness. Precipitation runoff from the mountain drains west into Deception Creek, or east into tributaries of Icicle Creek. The nearest higher neighbor is Granite Mountain, to the south-southeast, and Surprise Mountain is set to the northwest. The Pacific Crest Trail skirts below the west side this peak.