Dutsen Altay (wanda kuma aka rubuta Altai Mountains) wani tsauni ne dake tsakiyar Asiya ta tsakiya, inda iyakokin Rasha, China, Mongoliya, da Kazakhstan ke haduwa. Sunan "Altay" ya samo asali ne daga kalmar Mongolian "altan", wanda ke nufin "zinariya", kuma yana nufin launin tsaunuka a lokacin kaka. Tsaunukan Altay an san su da ƙayatattun kyan su, namun daji iri-iri, da tarihin al'adu masu yawa, kuma sanannen wuri ne ga masu sha'awar waje da matafiya.