Finnish (endonym: suomi [ˈsuo̯mi] or suomen kieli [ˈsuo̯meŋ ˈkie̯li]) is a Finnic language of the Uralic language family, spoken by the majority of the population in Finland and by ethnic Finns outside of Finland. Finnish is one of the two official languages of Finland, alongside Swedish. In Sweden, both Finnish and Meänkieli (which has significant mutual intelligibility with Finnish) are official minority languages. Kven, which like Meänkieli is mutually intelligible with Finnish, is spoken in the Norwegian counties of Troms and Finnmark by a minority of Finnish descent. However, these are recognized as independent languages in their relative countries for sociohistorical reasons.
Finnish is typologically agglutinative and uses almost exclusively suffixal affixation. Nouns, adjectives, pronouns, numerals and verbs are inflected depending on their role in the sentence. Sentences are normally formed with subject–verb–object word order, although the extensive use of inflection allows them to be ordered differently. Word order variations are often reserved for differences in information structure. Finnish orthography uses a Latin-script alphabet derived from the Swedish alphabet, and is phonemic to a great extent. Vowel length and consonant length are distinguished, and there are a range of diphthongs, although vowel harmony limits which diphthongs are possible.
Finnish belongs to the Finnic branch of the Uralic language family; as such, it is one of the few European languages that is not Indo-European. The Finnic branch also includes Estonian and a few minority languages spoken around the Baltic Sea and in Russia's Republic of Karelia. The closest relative of Finnish is either Ingrian, or depending on the definition, Karelian. Finnic languages form a dialect continuum, where for instance Finnish and Estonian are not separated by any single isogloss that would separate dialects considered "Finnish" from those considered "Estonian", despite the two standard languages being not mutually intelligible.
Finnish demonstrates an affiliation with other Uralic languages (such as Hungarian and Sami languages) in several respects including:
case suffixes such as genitive -n, partitive -(t)a / -(t)ä ( < Proto-Uralic *-ta, originally ablative), essive -na / -nä ( < *-na, originally locative)
plural markers -t and -i- ( < Proto-Uralic *-t and *-j, respectively)
possessive suffixes such as 1st person singular -ni ( < Proto-Uralic *-n-mi), 2nd person singular -si ( < Proto-Uralic *-ti).
various derivational suffixes (e.g. causative -tta/-ttä < Proto-Uralic *-kta)
Shared basic vocabulary displaying regular sound correspondences with the other Uralic languages (e.g. kala 'fish' ~ North Saami guolli ~ Hungarian hal; and kadota 'disappear' ~ North Saami guođđit ~ Hungarian hagy 'leave (behind)'.
Several theories exist as to the geographic origin of the most recent common ancestor of Finnish and the other Uralic languages (Proto-Uralic). The most widely held view is that it originated somewhere in the boreal forest belt around the Ural Mountains region and/or the bend of the middle Volga. The strong case for Proto-Uralic is supported by common vocabulary with regularities in sound correspondences, as well as by the fact that the Uralic languages have many similarities in structure and grammar. Despite having overlapping geographical distributions, Finnic languages and Sami languages are not closely related, and the hypothesis of a separate taxonomic "Finno-Samic" node is controversial.
The Defense Language Institute in Monterey, California, United States, classifies Finnish as a level III language (of four levels) in terms of learning difficulty for native English speakers.
Finnish is spoken by about five million people, most of whom reside in Finland. There are also notable Finnish-speaking minorities in Sweden, Norway, Russia, Estonia, Brazil, Canada, and the United States. The majority of the population of Finland (90.37% as of 2010) speak Finnish as their first language. The remainder speak Swedish (5.42%), one of the Sámi languages (for example Northern, Inari, or Skolt), or another language as their first language. Finnish is spoken as a second language in Estonia by about 167,000 people. The Finnic varieties found in Norway's Finnmark (namely Kven) and in northern Sweden (namely Meänkieli) have the status of official minority languages, and thus can be considered distinct languages from Finnish. However, since these languages are mutually intelligible, one may alternatively view them as dialects of the same language.
No language census exists for Norway, neither for Kven, standard Finnish, or combined. As of 2023, 7,454 first- or second-generation immigrants from Finland were registered as having Norwegian residency, while as of 2021, 235 Finns were registered as foreigners studying at Norwegian higher education. Great Norwegian Encyclopedia estimates Kven speakers at 2,000-8,000. Altogether, this results in a total amount of Finnish-speakers roughly between 7,200 and 15,600.
In the latest census, around 1000 people in Russia claimed to speak Finnish natively; however, a larger amount of 14,000 claimed to be able to speak Finnish in total.
There are also forms of Finnish spoken by diasporas outside Europe, such as American Finnish, spoken by Finnish Americans, and Siberian Finnish, spoken by Siberian Finns.
Today, Finnish is one of two official languages of Finland (the other being Swedish), and has been an official language of the European Union since 1995. However, the Finnish language did not have an official status in the country during the period of Swedish rule, which ended in 1809. After the establishment of the Grand Duchy of Finland, and against the backdrop of the Fennoman movement, the language gained official standing through the Language Rescript of 1863, an imperial decree issued in the same year as the first Diet since 1809.
Finnish also enjoys the status of an official minority language in Sweden. Under the Nordic Language Convention, citizens of the Nordic countries speaking Finnish have the opportunity to use their native language when interacting with official bodies in other Nordic countries without being liable to any interpretation or translation costs. However, concerns have been expressed about the future status of Finnish in Sweden, for example, where reports produced for the Swedish government during 2017 show that minority language policies are not being respected, particularly for the 7% of Finns settled in the country.
The Uralic family of languages, of which Finnish is a member, are hypothesized to derive from a single ancestor language termed Proto-Uralic, spoken sometime between 8,000 and 2,000 BCE (estimates vary) in the vicinity of the Ural Mountains. Over time, Proto-Uralic split into various daughter languages, which themselves continued to change and diverge, yielding yet more descendants. One of these descendants is the reconstructed Proto-Finnic, from which the Finnic languages developed.