| Mount McArthur | |
| Range: | Walton Mountains |
| Location: | Alexander Island, Antarctica |
| Map: | Antarctica |
| Coordinates: | -71.1833°N -90°W |
Mount McArthur is, at about, the highest peak in the Walton Mountains of southern Alexander Island, Antarctica. It was named by the UK Antarctic Place-Names Committee after Malcolm McArthur, a British Antarctic Survey geophysicist at Stonington Island, 1971–73, who worked in northern Alexander Island.