• Albanian: Spoken in Albania and Kosovo.
• Belarusian: Official in Belarus.
• Bosnian: Official in Bosnia and Herzegovina.
• Bulgarian: The official language of Bulgaria.
• Croatian: Official in Croatia.
• Czech: The official language of the Czech Republic.
• Estonian: The official language of Estonia.
• Gagauz: Spoken by the Gagauz people in Moldova.
• Hungarian: The official language of Hungary.
• Latvian: The official language of Latvia.
• Lithuanian: The official language of Lithuania.
• Macedonian: Official in North Macedonia.
• Montenegrin: Official in Montenegro.
• Polish: Spoken in Poland.
• Romanian: Spoken in Romania and Moldova.
• Russian: Spoken in Russia, Belarus, and parts of Ukraine.
• Serbian: Official in Serbia and widely spoken in other Balkan countries.
• Slovak: Spoken in Slovakia.
• Slovenian: Spoken in Slovenia.
• Ukrainian: The official language of Ukraine.

These languages contribute to the rich linguistic diversity of East Europe.