Bikorn Lake (Bulgarian: езеро Бикорна, romanized: ezero Bikorna, IPA: ['ɛzɛro bi'kɔrnɐ]) is the lake occupying most of the interior of Treklyano Island off the northeast coast of Robert Island in the South Shetland Islands, Antarctica. It extends 205 m in west-northwest to east-southeast direction and 137 m in south–north direction, with a surface area of 1.46 ha, and is separated from the waters of Nelson Strait by a 21 to 70 m wide strip of land. The area was visited by early 19th century sealers.