Cacán (also Cacan, Kakán, Calchaquí, Chaka, Diaguita, and Kaka) is an extinct language that was spoken by the Diaguita and Calchaquí tribes in northern Argentina and Chile. It became extinct during the late 17th century or early 18th century. The language was documented by the Jesuit Alonso de Bárcena, but the manuscript is lost. Genetic affiliation of the language remains unclear, and it has not been possible to link it to any existing language family.