Rusyn (/ ˈ r uː s ɪ n /; Carpathian Rusyn: русиньскый язык, romanized: rusîn'skyj jazyk; Pannonian Rusyn: руски язик, romanized: ruski jazik), also known by the older term, руснацькый язык, rusnac'kyj jazyk, 'Rusnak language', is an East Slavic language spoken by Rusyns in several parts of Central and Eastern Europe, and written in the Cyrillic script.

The Ruthenian Greek Catholic Church (Rusyn: Русиньска ґрекокатолицька церьков; Latin: Ecclesia Graeco-Catholica Ruthenica), also known in the United States simply as the Byzantine Catholic Church, is an Eastern Catholic church that uses the Byzantine Rite for its liturgies, laws, and cultural identity. It is one of the 23 Eastern Catholic churches that are in ...