The Altay or Altai are a conglomerative ethnic group of Mongolic, Tungusic and Turkic peoples living in the Siberian Altai Republic and Altai Krai and surrounding areas of Tuva and Mongolia and Manchuria. For alternative ethnonyms see also Teleut, Tele, Telengit, Mountain Kalmuck, White Kalmuck, Black Tatar, Oirat/Oirot.

The Uriankhai people were annexed by the Oirat Zunghars in the 16th century. After the fall of the Zunghar Khanate in the 18th century, the Uriankhai were subjugated by the Qing Dynasty; and their one part, Altayans, was called by the Qing court as Altan Nuur Uriyangkhai. They have had skills in metalworking dating back to the 2nd millennium BC. The Altay came into contact with Russians in the 18th century. In the tsarist period, the Altay were known as oirot or oyrot (this name means oirat and would later be carried on for the Oyrot Autonomous Oblast). The Altay report that many of them became addicted to the Russians' vodka, which they called "fire water".

The Altay were originally nomadic, with a lifestyle based on hunting / trapping and pastoralism (mainly cattle, sheep, goats), but many of them settled as a result of Russian influence. In regard to religion, some of the Altay remain Tengriists or Shamanists, while others (in a trend beginning in the mid-19th century) have converted to the Orthodox. (The Altai mission took shape under Saint Makarii Glukharev, Apostle to the Altai.) In 1904, a religious movement called Ak Jang or Burkhanism arose, perhaps in response to Russian colonization.