Cornwallis Island is an island 1 mile (1.6 km) long, which lies 5 miles (8 km) northeast of the east end of Elephant Island, in the South Shetland Islands. The name Cornwallis Island dates back to about 1821[citation needed] and is now established in international usage.

A map of the South Shetland Islands, Cornwallis is upper right | |
| Geography | |
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| Location | Antarctica |
| Coordinates | 61°04′S 54°28′W |
| Archipelago | South Shetland Islands |
| Length | 1.0 mi (1.6 km) |
| Administration | |
| Administered under the Antarctic Treaty System | |
| Demographics | |
| Population | uninhabited |
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