Marsh Cirque (77°30′S161°27′E) is a cirque in the southern part of Mount Hercules, Olympus Range, Antarctica. The cirque is 1 nautical mile (2 km) wide and in part occupied by a glacier. It was named by the Advisory Committee on Antarctic Names in 2004 after geologist Bruce D. Marsh, of the Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland.