Pumpelly Pillar is a mountain in Glacier National Park’s Lewis Range, rising 7,625 feet in the Two Medicine region of the park’s southeastern section in Montana. The peak is likely named for Raphael Pumpelly, who led the Northern Transcontinental Railway Survey party across Pitamakan Pass in 1883. Its name reflects a period of exploration and route-finding that expanded understanding of this part of the northern Rockies and links the mountain to that broader history.