Karelian (/kəˈriːliən, kəˈriːljən/; Karelian Proper and Livvi-Karelian: karjala, karjalan kieli; Ludian: kard'al, kard'alan kiel'; Tver Karelian: kariela, karielan kieli) is a Finnic language spoken mainly by the Karelian people in the Russian Republic of Karelia. Linguistically, Karelian is closely related to the Finnish dialects spoken in eastern Finland, and some Finnish linguists have even classified Karelian as a dialect of Finnish, but nowadays it is widely considered a separate language. Karelian is not to be confused with the Southeastern dialects of Finnish, sometimes referred to as karjalaismurteet ("Karelian dialects") in Finland. In the Russian 2020–2021 census, around 9,000 people spoke Karelian natively, but around 14,000 said they were able to speak the language. There are around 11,000 speakers of Karelian in Finland, and around 30,000 people in Finland have at least some knowledge of Karelian.
The Karelian language is a group of two supradialects. The two supradialects are Karelian Proper (which comprises Northern Karelian and South Karelian (including the Tver enclave dialects)) and Olonets Karelian (Livvi Karelian). The Ludic language is sometimes considered one more dialect of Karelian, sometimes a separate language. There is no single standard Karelian language, so each writer writes in Karelian according to their own dialectal form. All variants are written with the Latin-based Karelian alphabet, though the Cyrillic script has been used in the past.