Tsagaan-Üür (Mongolian: Цагаан-Үүр, white dawn) is a sum of Khövsgöl aimag.

In 2000, Tsagaan-Üür had a population of 2,421 people, including Khalkha, Uriankhai, and Buriad.

The sum center, officially named Bulgan (Mongolian: Булган), is located on the banks of the Üür River, 173 km north-east of Mörön and 844 km from Ulaanbaatar.

In 2004, there were about 22,000 head of livestock, among them 3,400 goats, 3,900 sheep, 11,300 cattle and yaks, and 3,400 horses, but no camels.

[1] About 35 km east of the sum center is a cave known as Dayan deerkhiin agui.