Logan Glacier is in Glacier National Park in the U.S. state of Montana. The glacier is situated in a cirque to the northeast of Mount Logan. Just east of the Continental Divide, Logan Glacier is northwest of Red Eagle Glacier. Estimated in 2005 to cover an area of , Logan Glacier covered almost in 1966, a reduction in area of 40 percent in about 40 years. Comparing images of the glacier taken in 1914 with those from 2009, indicates that the glacier has experienced extensive retreat.