The Tobol-Irtysh dialect is a dialect of Siberian Tatar language spoken in Tyumen and Omsk Oblast in Russia, and gets its name from the Tobol and Irtysh rivers.
It is generally classed among the dialects of the Tatars of Siberia, of which some also speak Baraba. Johanson groups these dialects under the name of Western Siberian Tatar.
According to Tumasheva, Tobol-Irtysh Tatar has 5 dialects:
The Tevriz dialect has elements of Southern Altai, Khakas and Shor.
In 2000, a primer of Tobol-Irtysh Tatar was published. Its orthography includes the letters of the Russian alphabet, plus the extra letters àÃÂ, àÃÂ, àá, â ã, è é, and î ï.