The Plains Apache language is a Southern Athabaskan language formerly spoken by the Plains Apache, organized as the Apache Tribe of Oklahoma, living primarily around Anadarko in southwest Oklahoma. The language is extinct as of 2008, when Alfred Chalepah, Jr., the last native speaker, died.
Plains Apache is the most divergent member of the Southern Athabaskan languages, a family which also includes Navajo, Chiricahua Apache, Mescalero Apache, Lipan Apache, Western Apache, and Jicarilla Apache. As a member of the broader Athabaskan family, it has an extremely complex system of verbal morphology, often enabling entire sentences to be constructed with only a verb.