], the indigenous ethnic group which lives along the Mahakam River in Borneo, especially in East Kalimantan, Indonesia.

Kutai is part of the local Bornean Malayic languages and is closely related to but distinct from the Banjar language in South Kalimantan, Berau, also spoken in North Kalimantan and to some extent Brunei-Kedayan Malay as well.

Kutai forms a dialect continuum between the two varieties and all three share similar phonology and vocabulary with each other.

Kutai for most of its history is mainly a spoken language and is mostly used as a form of poetry (pantun).

The three main dialects are Tenggarong, Kota Bangun, and Ancalong Estuary.