Benson Glacier was a glacier in the U.S. state of Oregon and the last active glacier in the Wallowa Mountains. Situated at an elevation generally above on the northeastern slopes Glacier Peak, a subpeak of Eagle Cap, it is now a stagnant ice mass. The glacier was named in honor of Frank W. Benson, former Governor of Oregon during an expedition in 1914. In the 1980s, when it was still an active glacier, Benson Glacier had an estimated area of 0.016 square kilometers.
Benson Glacier was the last remaining remnant of Wallowa Glacier which extended , creating the lateral moraines that created Wallowa Lake during the Last Glacial Maximum. Its ice is estimated to have been thick in places. The West Fork of the Wallowa River occupies the valley it left behind.