Nakho-Dagestanian languages, group of languages spoken in the northeastern Caucasus Mountains. The Nakh division consists of the languages of the Chechen, Ingush, and Bats. The Dagestanian division is more multifarious and includes such groups as the Avar-Andi-Dido languages, the Lak-Dargin (Lak-Dargwa) languages, and the Lezgian languages. See also Dagestanian languages; Nakh languages.