Mount Masley is a prominent flat-topped summit, 2,605 metres (8,550 ft) high, in the narrow, northern part of Pain Mesa, situated 11 nautical miles (20 km) east of Silva Ridge in the Mesa Range, Antarctica. It was mapped by United States Geological Survey from surveys and U.S. Navy air photos, 1960–64, and was named by the Advisory Committee on Antarctic Names for Andrew J.