The title of this article is ambiguous. For other meanings, see Volga (disambiguation).

The Volga (Russian Волга, Tatar Идел / İdel, Ersyan Рав, Mokshan Рава, Chuvash Атӑл, Meadow Mari Юл, Mountain Mari Йыл, Ancient Greek Ῥᾶ Rha) is a river in the European part of Russia. With a length of 3530 km, it is the longest and most water-rich river in Europe and one of the longest rivers on Earth (ranked 17th). The Volga is the longest endorheic river on Earth, making it one of the largest bodies of water that have no natural connection to the oceans.

The Volga rises in the Waldai Heights at 228 m above Baltic Sea level, flows initially eastwards, then southwards through the East European Plain and flows into the Caspian Sea at 28 m below Baltic Sea level. The difference in altitude between the source and the mouth is 256 m.

The Volga has about 200 major tributaries, its catchment area of 1.36 million km² area includes a total of 151,000 rivers, streams and temporary watercourses. At the lower reaches in Volgograd, the average annual discharge is 264 billion m³.

The river is navigable from its mouth into the Caspian Sea to its upper reaches and is the core of the waterway between the Black and Caspian Seas in the south and the Baltic and White Seas in the north. All barrages are equipped with locks. The Volga-Baltic Sea Canal connects the Volga with the Baltic Sea to the west, and the White Sea-Baltic Sea Canal, which branches off from the Volga-Baltic Sea Canal to the north, connects the Volga with the White Sea and thus also with the Arctic Ocean. Via the Volga-Don Canal and the Don River flowing to the west, it is connected to the Black Sea and the Mediterranean Sea.