Koasati (also Coushatta) is a Native American language of Muskogean origin. The language is spoken by the Coushatta people, most of whom live in Allen Parish north of the town of Elton, Louisiana, though a smaller number share a reservation near Livingston, Texas, with the Alabama people. In 1991, linguist Geoffrey Kimball estimated the number of speakers of the language at around 400 people, of whom approximately 350 live in Louisiana.