Altai Krai (Russian: Алта́йский край, tr. Altaysky kray; IPA: [ɐlˈtajskʲɪj kraj]) is a federal subject of Russia (a krai). It borders with, clockwise from the west, Kazakhstan, Novosibirsk and Kemerovo Oblasts, and the Altai Republic. The krai's administrative center is the city of Barnaul. As of the 2010 Census, the population of the krai was 2,419,755.

Altai Krai has rolling foothills, grasslands, lakes, rivers, and mountains.

The climate is severe with long cold dry winters and hot, usually dry summers. The region's main waterway is the Ob River. The Biya and Katun Rivers are also important. The biggest lakes are Lake Kulundinskoye, Lake Kuchukskoye, and Lake Mikhaylovskoye.

Altai Krai has huge reserves of raw materials, especially materials used for building, as well as significant mineral reserves. These include nonferrous metals, lead and iron ores, manganese, tungsten, molybdenum, bauxite, and gold. Forests cover about 60,000 km² of the krai's land. See also Geography of South-Central Siberia.

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