Lake Beyşehir (Turkish: Beyşehir Gölü; anciently, Carallis or Karallis (Ancient Greek: Κάραλλις), or Caralis or Karalis (Κάραλις)[1][2]) is a large freshwater lake in Isparta and Konya provinces in southwestern Turkey.

It carries the same name as the principal urban centre of its region, Beyşehir.

Lake Beyşehir is used for irrigation and aquaculture, although it is also a national park.

Lake Beyşehir is also an important site for many bird species.

The highest water level in the same period was 1125.50 metres in March 1981, with a surface area of 74,600 hectares.