Luba people
The constitution does not specify which of the two major variations of Tshiluba is the national language. Luba-Kasai is spoken in the East Kasai Region (Luba people) and Luba-Lulua is used in the West Kasai Region among the Bena Lulua people. Luba-Kasai seems to be the language used by the administration. A related language, known as Luba-Katanga, is spoken in Katanga Province.