The Sura (Russian: Сура́, Chuvash: Сăр) is a river in Russia, a north-flowing right tributary of the Volga River. Its mouth on the Volga is about half way between Nizhny Novgorod and Kazan. It flows through Penza Oblast, Mordovia, Ulyanovsk Oblast, Chuvashia and Nizhny Novgorod Oblast.