Eastern Europe:
* Russia: The most prominent user of Cyrillic.
* Belarus: Official language.
* Ukraine: Official language, though there is a movement to switch to the Latin alphabet.
* Moldova: Officially uses the Latin alphabet, but Cyrillic is still used by some speakers.
* Bulgaria: Official language.
* Serbia: Official language.
* North Macedonia: Official language.
* Montenegro: Official language.
Asia:
* Kazakhstan: Official language.
* Kyrgyzstan: Official language.
* Uzbekistan: Official language (though it's undergoing a gradual shift towards the Latin alphabet).
* Turkmenistan: Official language.
* Tajikistan: Official language.
Other:
* Mongolia: Official language.
* Transnistria (a breakaway region of Moldova): Official language.
* Some regions of China: Used by several ethnic groups.
It's important to note that while Cyrillic is used in these countries, they may not be the only alphabet used. Some countries may also use other alphabets, such as Latin or Arabic, for certain purposes.