This study concerns the native language of Shirazi Jews, most of whom live in diasporic communities outside Iran. The language Judeo-Shirazi belongs to the Southwest Iranian group, as do most other native languages spoken in southern Iran. As such, Judeo-Shirazi shows general agreements with native rural varieties spoken in inland Fārs. There are, however, phonological features suggesting that Judeo-Shirazi is an insular survivor of the Medieval Shirazi language, from which a sizable literature has survived dating back to the fifteenth century.