Ingraham Glacier, Active glacier on Mount Rainier's southeastern flank, Washington, United States

Ingraham Glacier begins at Mount Rainier's summit ice cap and flows east between Gibraltar Rock, 12,660 ft, and Disappointment Cleaver, passing south of Little Tahoma Peak at 11,138 ft. Its surface shows jagged ice formations and penitentes, with blue crevasses and darker rock ridges breaking the white ice. Descending southeast, it nearly meets the east flank of Cowlitz Glacier at about 6,700 ft.

The glacier was named after Edward Sturgis Ingraham, an early explorer of Mount Rainier who documented the peak's features. During the last ice age roughly 35,000 years ago, the glacier was part of a much larger ice system that extended far down the mountain.

The glacier is named for Edward Sturgis Ingraham, a Mount Rainier enthusiast; the sources record only this dedication to the mountain, not a role in documenting its features. Climbers today pass Gibraltar Rock and Disappointment Cleaver on the ice he names.

Visitors require a permit from Mount Rainier National Park to access the glacier and typically start from Camp Muir. The route across the adjacent glacier involves ice travel and demands proper mountaineering skills and equipment.

On June 21, 1981, an ice fall on the Ingraham Glacier killed eleven people, the worst mountaineering accident in American history. None of the bodies were ever recovered.