Pannonian Rusyns, also known as Pannonian Rusnaks, and formerly known as Yugoslav Rusyns, are ethnic Rusyns from the southern regions of the Pannonian Plain. Their communities are located mainly in Vojvodina, Serbia, and Slavonia, Croatia. In both of those countries, they are officially recognized as a national minority, and have several minority institutions and organizations.

Rusyns, also known as Carpatho-Rusyns, Ruthenians, or Rusnaks, are an East Slavic ethnic group from the Eastern Carpathians in Central Europe. They speak Rusyn, an East Slavic language variety, treated variously as either a distinct language or a dialect of the Ukrainian language. As traditional adherents of Eastern Christianity, the majority of Rusyns are Eastern Catholics, though a minority of Rusyns practice Eastern Orthodoxy. Rusyns primarily self-identify as a distinct Slavic people and they are recognized as such in Croatia, Hungary, Poland, Romania, Serbia, and Slovakia, where they have official minority status. Alternatively, some identify more closely with their country of residence, while others are a branch of the Ukrainian people.