Lupfer Glacier is in Glacier National Park in the U.S. state of Montana. The glacier is situated immediately to the east of Mount Phillips at an elevation between 6,500 ft (2,000 m) and 6,000 ft (1,800 m) above sea level. Lupfer Glacier covers an area of approximately 16 acres (0.065 km²) and does not meet the threshold of 25 acres (0.10 km²) often cited as being the minimum size to qualify as an active glacier.