Vetluga (Russian:Ветлу́га;IPA:[vʲɪtˈlugə], Mari:Вӱтла, Vütla) is a river in the Kirov Oblast, Kostroma Oblast, Mari El Republic and Nizhny Novgorod Oblast of Russia. It is a left tributary of Volga, confluence near Kozmodemyansk. The river is navigable.