Slovincian is the westernmost directly attested dialect of Kashubian. It was spoken close to the Baltic Sea coast, circa 100 km northwest of Gdańsk and circa 20 km northeast of Słupsk (Poland) and became permanently extinct during the first half of the 20th century.

The primary vernacular name of the dialect was slɵvji͂nsħï ‘Slovincian’. However, the denotation Kashubian was also used, being simultaneously the basic term referring to the ethnic identity of the speakers. Besides, the name Slovincian had additional connotations (referring to the la…