Kuznetsk Alatau (Russian: Кузнецкий Алатау) is a mountain range in southern Siberia, Russia.

The range rises in the Altai-Sayan region of the South Siberian Mountains, northwest of Mongolia.

The mountains have generally a smooth outline with rather steep western slopes and gentler eastern ones.

The highlands are occupied mostly by vast large-stoned screes, and also by patches of subalpine meadows and, on some southern mountain massifs, of bushy, lichen and moss tundras.

The basin of the Kondoma River in Gornaya Shoriya is remarkable for the Siberian lime-tree woods which are thought to be the relics of a pre-Pleistocene nemoral vegetation of Siberia.