Over 1,250 square kilometers of woodland are ablaze in at least six eastern regions, Russia's federal forestry agency said.
The republic of Buryatia, which borders Mongolia and the eastern shore of Lake Baikal, is fighting to extinguish 60 blazes raging through 717 square kilometers of land, the agency was quoted by AFP as saying.
Wildfires are a common occurrence in Russia each summer due to the burning of dry grass, and can claim lives and damage property.
The current wildfires have not yet affected inhabited areas, according to authorities.
In April, at least 34 people died in southern Siberia as a results of wildfires. Hundreds of others were rendered homeless.
Investigators at the time launched probes into the deadly fires to determine whether they could have been caused by negligence.