Lake Awasa is an endorheic basin in Ethiopia, located in the Main Ethiopian Rift south of Addis Ababa. According to the Statistical Abstract of Ethiopia for 1967/68, the lake is 16 km long and 9 km wide, with a surface area of 129 square kilometers. It has a maximum depth of 10 meters and is located at an elevation of 1,708 meters.

Because it is relatively accessible to scientists, Lake Awasa is the most studied of the Rift Valley lakes in Ethiopia. According to William Taylor, a member of the African Lakes and Rivers Research Group at the University of Waterloo, Lake Awasa is, despite its lack of an outflow, "essentially a freshwater lake (conductivity is variable, but less than 1,000) indicating that it must have a subterranean outlet."