East Slavic languages

: Old East Slavic, Ukrainian language, Rusyn language, Belarusian language, Russian language

West Slavic languages

┣ Czech–Slovak languages

┃: Czech language, Slovak language

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┣ Lechitic languages

┃: Polish language

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┗ Sorbian languages

　: Upper Sorbian language

South Slavic languages

┣ Eastern South Slavic

┃: Old Church Slavonic, Macedonian language, Bulgarian language

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┗ Western South Slavic

　┣ Serbo-Croatian

　┃: Bosnian language, Serbian language, Croatian language, Montenegrin language

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　┗ Slovene language