Ardley Island is an island 2 km (1.2 mi) long, lying in Maxwell Bay close off the south-west end of King George Island, in the South Shetland Islands of Antarctica. It was charted as a peninsula in 1935 by Discovery Investigations personnel of the Discovery II and named for Lieutenant R.A.B. Ardley, Royal Naval Reserve, an officer on the ship in 1929–31 and 1931–33. Aerial photography has since shown that the feature is an island. It has been designated an Antarctic Specially Protected Area (ASPA 150) because of the importance of its seabird colonies.
The island has been identified as an Important Bird Area by BirdLife International because it supports a breeding colony of about 4600 pairs of Gentoo Penguins, as well as smaller numbers of Adélie and Chinstrap Penguins, Southern Giant Petrels, Wilson's and Black-bellied Storm Petrels, Cape Petrels, Brown and South Polar Skuas, and Antarctic Terns.
This article incorporates public domain material from the United States Geological Survey document "Ardley Island" (content from the Geographic Names Information System).
Coordinates: 62°13′S 58°56′W / 62.217°S 58.933°W