The Aley (Russian: Алей) is a river in Altai Krai, Russia. It is a left tributary of the Ob. It is 858 kilometres (533 mi) long, and has a drainage basin of 21,100 square kilometres (8,100 sq mi). Some of the towns along the river are Rubtsovsk, Gorkovskoye and Aleysk.

The river flows along the Ob Plateau in its middle and lower course.