The Kyustendil dialect is a Bulgarian dialect, member of the Southwestern Bulgarian dialects, which is spoken in the region of Kyustendil in central western Bulgaria.
It is closely related to the Dupnitsa dialect.
For other phonological and morphological characteristics typical for all Southwestern dialects, cf.
Southwestern Bulgarian dialects.
Стойков, Стойко: Българска диалектология, Акад.