Todzha Lake, also known as Azas Lake (Russian: Тоджа, Азас), is a lake in Tuva in Russia.

The lake has a surface area of 51.6 km (19.9 sq mi). The Azas River flows into and the Toora-Khem River flows out of Todzha Lake. The lake freezes in early November and remains icebound until the second half of May.