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.

The feature is so named because of its shape supposedly resembling a bicorne hat ('bikorn' in Bulgarian).

Bikorn Lake is centred at 62°22′05″S 59°24′31.5″W / 62.36806°S 59.408750°W / -62.36806; -59.408750, which is 3.18 km east of Ugarchin Point and 1.58 km west of Smirnenski Point. British mapping of the area in 1968 and Bulgarian in 2009.

• Livingston Island to King George Island. Scale 1:200000. Admiralty Nautical Chart 1776. Taunton: UK Hydrographic Office, 1968
• South Shetland Islands. Scale 1:200000 topographic map No. 3373. DOS 610 - W 62 58. Tolworth, UK, 1968
• L.L. Ivanov. Antarctica: Livingston Island and Greenwich, Robert, Snow and Smith Islands. Scale 1:120000 topographic map. Troyan: Manfred Wörner Foundation, 2009. ISBN 978-954-92032-6-4
• Antarctic Digital Database (ADD). Scale 1:250000 topographic map of Antarctica. Scientific Committee on Antarctic Research (SCAR). Since 1993, regularly upgraded and updated

• Bulgarian Antarctic Gazetteer. Antarctic Place-names Commission. (details in Bulgarian, basic data in English)

• Bikorn Lake. Adjusted Copernix satellite image

This article includes information from the Antarctic Place-names Commission of Bulgaria which is used with permission.