The Afanasievo culture, or Afanasevo culture (Afanasevan culture) (Russian: Афанасьевская культура Afanas'yevskaya kul'tura), is an early archaeological culture of south Siberia, occupying the Minusinsk Basin and the Altai Mountains during the eneolithic era, c. 3300 to 2500 BCE. It is named after a nearby mountain, Gora Afanasieva (Russian: Гора Афанасьева, lit. 'Afanasiev's mountain') in what is now Bogradsky District, Khakassia, Russia, first excavated by archaeologist Sergei Teploukhov from 1920 to 1929. Afanasievo burials have been found as far as Shatar Chuluu in central Mongolia, confirming a further expansion about 1,500 km beyond the Altai Mountains. The Afanasievo culture is now considered an integral part of the Prehistory of Western and Central Mongolia.
According to David W. Anthony the Afanasevan population was descended from people who migrated c. 3700–3300 BCE across the Eurasian Steppe from the pre-Yamnaya Repin culture of the Don-Volga region. It is considered to be "intrusive from the west", in respect to previous local Siberian cultures. According to Anthony, "The Afanasievo culture migration to the Altai was carried out by people with a Repin-type material culture, probably from the middle Volga-Ural region."