The Satsugū dialect , often referred to as the Kagoshima dialect , is a group of dialects or dialect continuum of the Japanese language spoken mainly within the area of the former Ōsumi and Satsuma provinces now incorporated into the southwestern prefecture of Kagoshima. It may also be collectively referred to as the Satsuma dialect, owing to both the prominence of the Satsuma Province and the region of the Satsuma Domain which spanned the former Japanese provinces of Satsuma, Ōsumi and the southwestern part of Hyūga. The Satsugū dialect is commonly cited for its mutual unintelligibility to even its neighboring Kyūshū variants, prompting the Max Planck Institute for Evolutionary Anthropology to classify it as a distinct language in the Japanesic branch in its Glottolog database. It shares over three-quarters of the Standard Japanese vocabulary corpus and some areal features of Kyūshū.

Japanese is the principal language of the Japonic language family spoken by the Japanese people. It has around 120 million speakers, primarily in Japan, the only country where it is the national language, and within the Japanese diaspora worldwide.