Tsagaannuur (Mongolian: цагааннуур, white lake) is a common place name in Mongolia:
- Terkhiin Tsagaan Nuur, a lake in the Arkhangai Aimag (province)
- Dood Tsagaan nuur, a lake in the Khövsgöl Aimag
- Tsagaannuur, Khövsgöl, the sum (district) west of the lake
- two other sums in different aimags of Mongolia: