The Aitcho Islands (‘Aitcho’ standing for ‘H.O.’ i.e. ‘Hydrographic Office’) are a group of minor islands on the west side of the north entrance to English Strait separating Greenwich Island and Robert Island in the South Shetland Islands, Antarctica, which are situated between Dee Island to the south and Table Island to the north. The group is separated from Dee Island and Sierra Island to the southwest by Villalón Passage . The area was visited by early 19th century sealers operating from nearby Clothier Harbour. During the austral summer the islands are often visited by Antarctic cruise ships with tourists who land to watch wildlife.