Beslen Island (Bulgarian: остров Беслен, romanized: ostrov Beslen, IPA: [ˈɔstrov ˈbɛslɛn]) is the rocky island off the northwest extremity of Low Island in the South Shetland Islands extending 240 m in east-west direction and 90 m wide.

The feature is named after the settlement of Beslen in Southwestern Bulgaria.

Beslen Island is located at 63°13′18″S 62°10′57″W / 63.22167°S 62.18250°W / -63.22167; -62.18250, which is 1.67 km northeast of Cape Wallace and 840 m north of Prisad Island. British mapping in 2009.

• South Shetland Islands: Smith and Low Islands. Scale 1:150000 topographic map No. 13677. British Antarctic Survey, 2009
• Antarctic Digital Database (ADD). Scale 1:250000 topographic map of Antarctica. Scientific Committee on Antarctic Research (SCAR). Since 1993, regularly upgraded and updated

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

• Beslen Island. Adjusted Copernix satellite image

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