Basalt Lake is a small freshwater lake surrounded by three basalt outcrops with ‘organ-pipe’ formations in their rocks, situated in the central part of the ice-free Byers Peninsula, Livingston Island in the South Shetland Islands, Antarctica. and draining through a 1.6 kilometres (0.99 mi) stream southwards into Bransfield Strait.
The feature is descriptively named from the surrounding rock formations.