The Varuna River is a minor tributary of the Ganges River. It is named after the god Varuna.
The Varuna rises at , flows east-to-southeast for some 100 km, and joins the Ganges at , just downstream of Varanasi. The name Varanasi itself is interpreted to be derived from the name of the river Varuna. The river demarcates the north end of Varanasi- The city that lies between Varuna and Assi Rivers.