As Siberia is in Russia, Russian is the primary language of Siberia. However, there are also a number of indigenous ethnic minorities who speak their own languages, e.g. Tartar and Bashkir. These languages differ immensely from Russian. There are also a lot of immigrants from Uzbekistan and Azerbaijan in Siberia, so you will hear these languages being spoken too.
People in Siberia speak Russian--Siberia is in Russia--and most likely some Mongolian or Chinese in the easternmost parts, since both of those countries border on the region.
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Siberia is a region in Russia where the vast majority of the population speak Russian.
There are some that speak Ukrainian and German as well.
Most non-Slavic ethnic groups are Turkish-speaking.
Smaller linguistic groups are:
Russian is the official language spoken in Siberia, as it is in other Russian places.