Mount Cox () is a mountain 1,960 metres (6,430 ft) high in the north-central part of the Emlen Peaks, 5 miles (8 km) north of Killer Nunatak. It was mapped by the United States Geological Survey (USGS) from surveys and from U.S. Navy air photos, 1960–63, and named by the Advisory Committee on Antarctic Names for Allen N. Cox, U.S. Navy, crew chief in R4D (Skytrain) aircraft during 1962–63 in support of the USGS Topo East-West survey. Cox returned to the Antarctic in the 1963–64 and 1964–65 seasons.