Agassiz Glacier is a valley glacier in the Saint Elias Mountains in southern Alaska (USA) and to a lesser extent on to Canadian territory.

The glacier was named by William Libbey, a member of The New York Times expedition in 1886, after Louis Agassiz (1807–1873), a Swiss-American naturalist.

The agglomeration of the Agassiz Glacier is located on the southern flank of Mount Malaspina north of the Canada–United States border. The 25 km long glacier is fed by the Newton Glacier. The three kilometres-wide glacier flows initially in a southwesterly direction, later in a south-easterly direction. From the west, the Libbey Glacier meets the Agassiz Glacier. This finally merges into the Malaspina Glacier, which finally flows into the Gulf of Alaska.

• List of glaciers

• Media related to Agassiz Glacier at Wikimedia Commons