Logan Glacier, Mountain glacier in Wrangell-St. Elias National Park, Alaska and Yukon Territory, Canada

Logan Glacier is a large glacier straddling the border between Alaska and Canada's Yukon Territory. The ice covers a vast area on Mount Logan's slopes and forms the headwaters of river systems in this remote region.

Logan Glacier takes its name from Mount Logan, on whose northern slopes it originates. The mountain honours William Edmond Logan, founder and long-serving director of the Geological Survey of Canada. The glacier is 85 km long and flows west through the Saint Elias Mountains, fed by the Ogilvie and Baldwin glaciers from the left and the Walsh Glacier from the right.

The glacier carries the name of William Edmond Logan, founder and long-serving director of the Geological Survey of Canada. Its two named tributaries, the Ogilvie and Baldwin glaciers, join from the left and the Walsh Glacier from the right. The ice ends at about 860 m, directly above the Chitina Glacier; both feed the Chitina River.

The area is difficult to reach because of its location in a protected national park and at the international border. Most visits require special permits from both countries and specialized mountain equipment.

The ice shows different flow rates on each side of the international border, creating visible patterns when viewed from above. These varying movement speeds result from local topography and snow accumulation on each side.