The Vanj (Tajik: Ванҷ, Russian: Ванч Vanch) is a river in east Tajikistan.

It is a right tributary of the Panj in Vanj District, north-western Gorno-Badakhshan.

At the head of the valley, beyond the village of Po-i-Mazar, the river turns southeast (going upstream) and is fed by the Geographical Society Glacier near Independence Peak.

Beyond the head of the valley are the Academy of Sciences Range and the Fedchenko Glacier.

South, on the other side of the Vanj Range, is the valley of the Yazgulem.