Lower Chulym is a Turkic dialect of Chulym formerly spoken by the Chulyms on the lower course of the Chulym river and its tributaries, the Kiya and the Yaya in Russia. It went extinct in 2011. It is sometimes grouped with Northern Altai and the Kondoma dialect of Shor, due to similarities.

When the Russian researcher Dulzon began to study Lower Chulym in the 1940s, the Lower Chulym Turks numbered no more than 250. In the 1990s, their Russification was nearly complete. The language is today, with no doubt, extinct.^[2]

Lower Chulym is classified in the Siberian group of Turkic languages. Russian linguists consider it to be a dialect of Chulym, together with Middle Chulym [ru]. However, this question is still open.

It is sometimes classed with Northern Altai and the Kondoma dialect of Shor in a Northern Altai group. This is due to the Lower Chulym reflex of Proto-Turkic -d- as -j-, for example proto-Turkic *adak 'leg' as айақ, ajaq 'leg', versus Middle Chulym азақ, azaq. It also bears similarities with the Tom and Baraba dialects of Siberian Tatar.

A third Turkic variety, Küärik, was spoken in the Chulym basin, north of Mariinsk. It is known from the work of Radloff, which comes from around 1900. This dialect, which had disappeared by the time of Dulzon in 1940, was considered by Radloff to be identical to Lower Chulym.^[3]

Key: K - Küärik, LC - Lower Chulym

The words for the numerals 80 and 90 are сексон and тоқсон, in contrast to сегизон/сегизен and тоғузон/тоғузан for the rest of the Northern Altai group, being an isogloss with Khalaj, Middle Chulym, Kipchak (except for Southern Altai), Karluk and Oghuz.

• Бирюкович, P. M. (1997). Чулымско-тюpкский язык. In Institut âzykoznaniâ (ed.). Tûrkskie âzyki Тюркские языки. Âzyki mira Языки мира (in Russian). Moskva: Izdatel'stvo Indrik. pp. 491–497. ISBN 978-5-85759-061-4.

• Pomorska, Marzanna (2004). Middle Tchulym Noun Formation. Studia Turcologica Cracoviensia. Księgarnia Akademicka. p. 256. ISBN 9788371887840.

• Ethnologue: Languages of the World (unknown ed.). SIL International.^{[This citation is dated, and should be substituted with a specific edition of Ethnologue]}