The Berezina or Biarezina (Belarusian: Бярэ́зіна; pronounced [bʲaˈrɛzʲinɐ]) is a river in Belarus and a right tributary of the Dnieper. The river starts in the Berezinsky Biosphere Reserve. The length of the Berezina is 613 km. The width of the river is 15-20 m, the maximum is 60 m. The banks are low (up to 0.5 m), steep in some areas (up to 1.5 m high), sandy, and the floodplain is swampy. Berezina freezes usually in the 1st half of December.

Its main tributaries are Bobr, Klyava, Ol'sa and Ala from the left and Hayna and Svislach from the right. The Berezina Biosphere Preserve by the river is on the UNESCO list of Biosphere Preserves. Peat bogs cover 430 km² and thus occupy an important part of the reserve. These open peat zones have remained virtually untouched and are among Europe's largest bogs.

Cities and towns on the Berezina from north to south

• Dokshytsy
• the village Studzionka
• the village Svislach
• Barysau
• Babruysk
• Svietlahorsk