Rusyn (ˈruːsᵻn; русиньскый язык; руски язик) is an East Slavic language spoken by Rusyns in parts of Central and Eastern Europe, and written in the Cyrillic script. Within the community, the language is also referred to by the older folk term, rusnac'kyj jazyk, or simply referred to as speaking our way (по-нашому). The majority of speakers live in an area known as Carpathian Ruthenia that spans from Transcarpathia, westward into eastern Slovakia and south-east Poland. There is also a sizeable Pannonian Rusyn linguistic island in Vojvodina, Serbia, as well as a Rusyn diaspora throughout the world. Per the European Charter for Regional or Minority Languages, Rusyn is officially recognized as a protected minority language by Bosnia and Herzegovina, Croatia, Hungary, Romania, Poland (as Lemko), Serbia, and Slovakia.
In the English language, the term Rusyn is recognized officially by the ISO. Other names are sometimes also used to refer to the language, mainly deriving from exonyms such as Ruthenian or Ruthene (UKrʊˈθiːn, USruːˈθiːn), that have more general meanings, and thus (by adding regional adjectives) some specific designations are formed, such as: Carpathian Ruthenian/Ruthene or Carpatho-Ruthenian/Ruthene.
The categorization of Rusyn as a language or dialect is a source of controversy. Czech, Slovak, and Hungarian, as well as American and some Polish and Serbian linguists treat it as a distinct language (with its own ISO 639-3 code), whereas other scholars (in Ukraine, Poland, Serbia, and Romania) treat it as a dialect of Ukrainian.
The classification of the Rusyn language has historically been both linguistically and politically controversial. During the 19th century, several questions were raised among linguists, regarding the classification of East Slavic dialects that were spoken in the northeastern (Carpathian) regions of the Kingdom of Hungary, and also in neighbouring regions of the Kingdom of Galicia and Lodomeria.