Cyrillic numerals are a numeral system derived from the Cyrillic script, developed in the First Bulgarian Empire in the late 10th century. It was used in the First Bulgarian Empire and by South and East Slavic peoples. The system was used in Russia as late as the early 18th century, when Peter the Great replaced it with Arabic numerals as part of his civil script reform initiative. Cyrillic numbers played a role in Peter the Great's currency reform plans, too, with silver wire kopecks issued after 1696 and mechanically minted coins issued between 1700 and 1722 inscribed with the date using Cyrillic numerals. By 1725, Russian Imperial coins had transitioned to Arabic numerals. The Cyrillic numerals may still be found in books written in the Church Slavonic language.

As the 9th-century missionaries Saints Cyril and Methodius undertook their mission to evangelize to the Slavs of Great Moravia, two writing systems were developed: Glagolitic and Cyrillic. Both scripts were based on the Greek alphabet and share commonalities, but the exact nature of relationship between the Glagolitic alphabet and the Early Cyrillic alphabet, their order of development, and influence on each other has been a matter of great study, controversy, and dispute in Slavic studies.