The Wilson Glacier is a medium-sized tributary glacier located on the southeast flank of Mount Rainier in Washington. Named after A.D. Wilson, who was part of an early ascent of Mount Rainier, the body of ice has an area of and has a volume of 1.9 billion feet3 (54 million m3). The glacier is directly feeds ice to the adjacent, but much larger Nisqually Glacier. Starting from the head at , the glacier flows downhill southward. One part of the glacier meets the Nisqually Glacier at and the other part of the glacier ends on a cliff in between the Wilson and Nisqually Glacier at . Meltwater from the glacier feeds the Nisqually River.