Argonaut Peak is a tall mountain in the Cascade Range in the U.S. state of Washington. Part of the Stuart Range part of the Wenatchee subrange of the Cascades, it is within the Alpine Lakes Wilderness of the Wenatchee National Forest and part of the region known as The Enchantments. At in elevation it is the 65th highest peak in Washington. Located on the crest between Colchuck Peak and Sherpa Peak, Argonaut Peak has a southeast and a west summit of almost identical height, with the west being the true summit. There is a prominent southeast spire. Its southern side slopes down to the valley of Ingalls Creek. The north and northeast sides of Argonaut stand high above a branch of Mountaineer Creek, a tributary of Icicle Creek. Argonaut Peak is west of Isolation Lake and east of Mount Stuart.