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.