Pannonian Rusyn, also historically referred to as Yugoslav Rusyn, is a variety of the Slovak language, spoken by the Pannonian Rusyns, primarily in the regions of Vojvodina and Slavonia, and also in the Pannonian Rusyn diaspora in the United States and Canada. Since Rusyns are officially recognized as a national minority both in Serbia and Croatia, their language is also recognized as a minority language, and in the Autonomous Province of Vojvodina (Serbia) it is employed as one of six official provincial languages.

Slovak is a West Slavic language of the Czech–Slovak group, written in Latin script. It is part of the Indo-European language family, and is one of the Slavic languages, which are part of the larger Balto-Slavic branch. Spoken by approximately 5 million people as a native language, primarily ethnic Slovaks, it serves as the official language of Slovakia and one of the 24 official languages of the European Union.