Pannonian Rusyn (руски язик, romanized: ruski jazik), 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 (northern part of modern Serbia) and Slavonia (eastern part of modern Croatia), 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 provincial administration of Serbian province of Vojvodina is employed as one of six languages in official use.
There are several scholarly debates on various linguistic issues related to this language, including the question whether Pannonian Rusyn should be reclassified as a distinct microlanguage, a dialect of Eastern Slovak, or still considered to be just a specific variety of the common Rusyn language, that also has other varieties, spoken by Rusyns in northern (Carpathian) regions, mainly in southwestern Ukraine, northeastern Slovakia, southeastern Poland, and northern Romania.