Kashan River is the left tributary of Murghab River in the Central Asian states of Afghanistan and Turkmenistan.

Kashan River flows into Badghis province, northwest of Afghanistan on the northern side of the Selseleh-ye Safīd Kūh (ancient name: Paropamisus ). From the north it flows to Turkmenistan and into the Murghab River close to Tagtabazar.

35°01′N 66°11′E / 35.017°N 66.183°E / 35.017; 66.183