Foyn Island () is the second largest island in the Possession Islands, East Antarctica, lying 4 miles (6 km) southwest of Possession Island. The island was explored by a Norwegian expedition of 1894-95 led by Henrik Johan Bull. The island was named for Svend Foyn, primary sponsor of the expedition. An Adélie Penguin rookery covers Foyn Island. Today, a visit by Foyn Island is often part of Antarctic cruises.
This article incorporates public domain material from the United States Geological Survey document "Foyn Island" (content from the Geographic Names Information System).