1. Russian:
The official language of the Russian Empire, spoken by the majority of the population.
2. Polish:
Spoken in the western regions of the Russian Empire, particularly in the Congress Kingdom of Poland and in areas with large Polish populations.
3. Ukrainian:
Spoken in the southern regions, especially in the Ukrainian Governorates and in parts of the Caucasus.
4. Belarusian:
Spoken in the western and central parts of the Russian Empire, particularly in Belarus and in areas with large Belarusian populations.
5. Finnish:
Spoken in the Grand Duchy of Finland, an autonomous part of the Russian Empire, as well as in some parts of Karelia.
6. Estonian:
Spoken in the Governorate of Estonia, an autonomous part of the Russian Empire.
7. Latvian:
Spoken in the Governorate of Livonia, an autonomous part of the Russian Empire.
8. Lithuanian:
Spoken in the Governorate of Kovno, an autonomous part of the Russian Empire, and in some parts of the Vilnius Governorate.
9. Armenian:
Spoken in the Armenian provinces, particularly in the Transcaucasia region.
10. Georgian:
Spoken in the Georgian Governorates, particularly in the Transcaucasia region.
11. Tatar:
Several Turkic languages spoken by different Tatar ethnic groups in Russia, such as the Kazan Tatars, Crimean Tatars, and Siberian Tatars.
12. Bashkir:
A Turkic language spoken by the Bashkir people in the Ural region of Russia.
13. Chuvash:
A Turkic language spoken by the Chuvash people in the Volga-Urals region of Russia.
14. Kazakh:
A Turkic language spoken by the Kazakh people in the Steppe region of Russia, particularly in the Ural-Caspian region.
15. Kirghiz (Kyrgyz):
A Turkic language spoken by the Kyrgyz people in the mountainous region of Russia, particularly in the Tien Shan mountains.
Note: There were numerous other languages spoken by various ethnic groups throughout the Russian Empire, including languages spoken by indigenous peoples in the Far East, Siberia, and the Caucasus.