The Resian dialect or simply Resian (self-designation Standard Rozajanski langäč / Rozojanski langäč, Bila Rozajanski langäč / Rozojanski langäč, Osoanë Rozoanske langäč, Solbica Rozajonski langeč / Rozojonski langeč; Slovene: rezijansko narečje [ɾɛziˈjáːnskɔ naˈɾéːt͡ʃjɛ], rezijanščina; Italian: Dialetto Resiano) is a distinct variety in the South Slavic continuum, generally considered a Slovene dialect spoken in the Resia Valley, Province of Udine, Italy, close to the border with Slovenia.
Together with the Rosen Valley dialect and Ebriach dialect in Carinthia, it is one of the three dialects of Slovene spoken entirely outside the borders of Slovenia. It is unequivocally one of the most distinct and difficult dialects to understand for speakers of central Slovene dialects, especially because most Resians are not familiar with standard Slovene. Its distinguishing characteristic is centralized, breathy vowels. It borders the Slovene Torre Valley dialect to the south and the Soča dialect to the east, both separated by tall mountain ranges. On the other sides, it mostly borders Friulian, but also Bavarian to the north. It belongs to the Littoral dialect group, although it shows few similarities with other Littoral dialects and evolved from the Carinthian dialect base, northern Slovene, as opposed to other Littoral dialects, which evolved either from western or southern Slovene. It is spoken by fewer than a thousand people and is listed as a definitely endangered language according to UNESCO's Atlas of the World's Languages in Danger. Despite this, Resians value their language and it is being passed down to younger generations.