Sea Lion Tarn (Bulgarian: езеро Морски Лъв, romanized: ezero Morski Lav, IPA: [ˈɛzɛro ˈmɔrski ˈɫɤf]) is a freshwater tarn with an area of 0.3 ha (0.74 acres) located between Sea Lion Glacier and the north-western slopes of Atlantic Club Ridge on Hurd Peninsula in eastern Livingston Island in the South Shetland Islands, Antarctica. The lake drains westward through a 100 m creek into South Bay.

The feature takes its name from the adjacent Sea Lion Glacier.

The midpoint is located at 62°38′48″S 60°22′14″W / 62.64667°S 60.37056°W / -62.64667; -60.37056 (Bulgarian mapping from a 1995-1996 ground survey).

• L.L. Ivanov. Livingston Island: Central-Eastern Region. Scale 1:25000 topographic map. Sofia: Antarctic Place-names Commission of Bulgaria, 1996.
• L.L. Ivanov et al. Antarctica: Livingston Island and Greenwich Island, South Shetland Islands. Scale 1:100000 topographic map. Sofia: Antarctic Place-names Commission of Bulgaria, 2005.
• 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 updated.
• L.L. Ivanov. Antarctica: Livingston Island and Smith Island. Scale 1:100000 topographic map. Manfred Wörner Foundation, 2017. ISBN 978-619-90008-3-0

• Sea Lion Tarn. SCAR Composite Antarctic Gazetteer
• Bulgarian Antarctic Gazetteer. Antarctic Place-names Commission. (details in Bulgarian, basic data in English)

• Sea Lion Tarn. Copernix satellite image

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