The people mainly speak in Lurish language.
Luri (lori:) is a Southwestern Iranian language spoken mainly by the Lur and Bakhtiari peoples of the Iranian provinces of Lorestan, Chaharmahal and Bakhtiari, Kohgiluyeh and Boyer-Ahmad and parts of Khuzestan and Esfahan province and Fars provinces. Lori is a descendant of a variant of Middle Persian and is lexically similar to modern Persian. According to the linguist Don Stilo: "Persian, Lori-Baḵtiāri and others, are derived directly from Old Persian through Middle Persian/Pahlavi". These dialects are also referred to as the “Persid” southern Zagros group. The special character of the Lori language suggests that its spreading area was Iranicized from Persia and not from Media. "Luri and Bakhtiari are much more closely related to Persian, than Kurdish." And Lori also represents a language continuum between Persian language and Kurdish language varieties, and is itself composed of three distinct languages: Loristani, Bakhtiari and Southern Lori.
Bakhtiari dialect is a dialect of Luri spoken by Bakhtiari people in Chaharmahal-o-Bakhtiari, western Khuzestan and parts of Isfahan and Lorestan provinces. It is closely related to the Boir-Aḥmadī, ...see more Kohgīlūya, and Mamasanī dialects in northwestern Fars. These dialects, together with the Lori dialects of Lorestan (e.g. Khorramabadi dialect), are referred to as the “Perside” southern Zagros group, or Lori dialects. "Luri and Bakhtiari are much more closely related to Persian, than Kurdish." There do exist transitional dialects between Southern Kurdish and Lori-Bakhtiāri', and Lori-Bakhtiāri itself may be called a transitional idiom between Kurdish and Persian.