Butterfly Glacier is in Wenatchee National Forest in the U.S. state of Washington and is on the northwest slopes of the northwest summit of Luahna Peak and the ridge which extends west from the peak. Butterfly Glacier is separated into two glaciers, the larger one in the east descends from . An arête separates Butterfly Glacier from Pilz Glacier to the east. Butterfly Glacier is within the Glacier Peak Wilderness and is just over southeast of Glacier Peak.