Mount Quackenbush (80°21′S156°58′E) is a flat-topped mountain, 2,435 m, which forms a projecting angle along the steep cliffs bordering the north side of Byrd Glacier, just west of Peckham Glacier. It was named by the Advisory Committee on Antarctic Names (US-ACAN) for Captain Robert S. Quackenbush, Jr., chief of staff to Admiral Cruzen (Central Group of Task Force 68) in U.S.