The Vetluga (Russian: Ветлу́га) is a river that flows through Kirov Oblast, Kostroma Oblast, Mari El and Nizhny Novgorod Oblast in Russia. It is a left tributary of the Volga. Their confluence is near Kozmodemyansk. The river is navigable. It is 889 kilometres long, and has a drainage basin of 39,400 square kilometres. Its largest tributaries are Neya, Bolshaya Kaksha, Usta and Yuronga from the left and Vokhma and Lyunda from the right. The town Vetluga is situated on the river and named after it.
