Pistiros Lake (, ) is the slightly bent southwards rectangular lake, 320 m long in west-east direction and 90 m wide on President Beaches, Byers Peninsula on Livingston Island in the South Shetland Islands, Antarctica. It has a surface area of 2.42 ha, and is separated from the waters of New Plymouth by a 20 to 35 m wide strip of land. The area was visited by early 19th century sealers.
The feature is named after the ancient emporium of Pistiros in Southern Bulgaria.
Pistiros Lake is centred at which is 900 m east of Laager Point and 2.08 km south of Ocoa Point. Detailed Spanish mapping in 1992, and Bulgarian mapping in 2009 and 2017.