The White Sea (, ) is an inlet of the Barents Sea on the northwest coast of Russia. It is surrounded by Karelia to the west, the Kola peninsula to the north, and the Kanin Peninsula to the northeast.

The important port of Arkhangelsk is located on the White Sea. For much of Russia's history this was Russia's main centre of international maritime trade, conducted by the so-called Pomors ("seaside settlers") from Kholmogory. In the modern era it became an important Soviet naval and submarine base. The White Sea-Baltic Canal connects the White Sea with the Baltic Sea.

The whole of the White Sea is under Russian sovereignty and considered to be internal waters of Russia.

There are four main bays and gulfs in the White Sea. From west to east, they are the Kandalaksha Gulf, the Onega Bay, the Dvina Bay, and the Mezen Bay.

In Turkish, the name Akdeniz, which translates into English as 'White Sea,' actually refers not to the sea north of Russia, but rather to the large body of water between Africa and Europe commonly known in the west as the Mediterranean Sea.

Islands

The White Sea has a very large number of islands, but most of them are small. The main island group in the White Sea is the Solovetsky Islands, located almost in its middle. Kiy Island in Onega Bay is significant due to a historic monastery. Velikiy Island, located close to the shore, is the largest island in the Kandalaksha Gulf.