The Tahoma Glacier is a long glacier mostly on the western flank of Mount Rainier in Washington. It covers and contains of ice. The glacier starts out near the summit of the volcano at over . As the glacier flows west-southwest out of the summit area, it cascades down a steep rocky face as an icefall from to , where the glacier is connected to the South Mowich Glacier to the north in the Sunset Amphitheater. As the glacier drops below , it broadens and joins the smaller South Tahoma Glacier. After the broad expanse of ice at over , the Tahoma Glacier narrows as it descends around the rocky Glacier Island, a sub-peak of Rainier once fully encircled by both the South Tahoma and Tahoma Glaciers. Leaving the bottleneck in the glacier, the glacier splits; the larger, longer northern arm continues flowing west-southwest and terminates at around . The southern arm flows south towards the arm of the South Tahoma Glacier, but this arm terminates before it rejoins the South Tahoma at . Meltwater from the glacier is the source of the South Puyallup River and Tahoma Creek, a tributary of the Nisqually River.